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Document and Entity Information - USD ($) $ in Millions	12 Months Ended
Document and Entity Information - USD ($) $ in Millions	Dec. 31, 2012	Feb. 28, 2013	Jun. 30, 2012
Entity Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Trading Symbol	CRK
Entity Registrant Name	COMSTOCK RESOURCES INC
Entity Central Index Key	0000023194
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		48,303,517
Entity Public Float			$ 734.6

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
ASSETS
Cash and Cash Equivalents	$ 4,471	$ 8,460
Accounts Receivable:
Oil and gas sales	36,150	47,082
Joint interest operations	5,608	6,651
Marketable Securities	12,312	47,642
Derivative Financial Instruments	11,651	459
Other Current Assets	6,954	2,796
Total current assets	77,146	113,090
Property and Equipment:
Unevaluated oil and gas properties	263,652	369,096
Oil and gas properties, successful efforts method	3,779,716	3,476,146
Other	19,301	18,062
Accumulated depreciation, depletion and amortization	(1,592,616)	(1,353,459)
Net property and equipment	2,470,053	2,509,845
Other Assets	19,944	16,949
Total Assets	2,567,143	2,639,884
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts Payable	86,346	94,041
Deferred Income Taxes Payable	5,340	7,664
Accrued Expenses	47,372	85,502
Total current liabilities	139,058	187,207
Long-term Debt	1,324,383	1,196,908
Deferred Income Taxes Payable	149,901	201,705
Reserve for Future Abandonment Costs	17,994	13,997
Other Non-Current Liabilities	2,273	2,442
Total liabilities	1,633,609	1,602,259
Commitments and Contingencies
Stockholders' Equity:
Common stock-$0.50 par, 75,000,000 shares authorized, 48,125,296 and 48,408,734 shares issued and outstanding at December 31, 2011 and 2012, respectively	24,204	24,063
Additional paid-in capital	480,595	468,709
Accumulated other comprehensive income	4,418	20,476
Retained earnings	424,317	524,377
Total stockholders' equity	933,534	1,037,625
Total liabilities and stockholders' equity	$ 2,567,143	$ 2,639,884

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2012	Dec. 31, 2011
Common stock, par value	$ 0.50	$ 0.50
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	48,408,734	48,125,296
Common stock, shares outstanding	48,408,734	48,125,296

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Oil and gas sales	$ 431,923	$ 434,367	$ 349,141
Gain on sale of oil and gas properties	24,271
Total revenues	456,194	434,367	349,141
Operating expenses:
Production taxes	14,021	3,670	9,894
Gathering and transportation	27,312	28,491	17,256
Lease operating	60,620	46,552	53,525
Exploration	61,449	10,148	2,605
Depreciation, depletion and amortization	365,286	290,776	213,809
General and administrative, net	33,798	35,172	37,200
Impairment of oil and gas properties	25,368	60,817	224
Loss on sale of oil and gas properties		57	26,632
Total operating expenses	587,854	475,683	361,145
Operating loss	(131,660)	(41,316)	(12,004)
Other income (expenses):
Gain on sale of marketable securities	26,621	35,118	16,529
Realized gain from derivatives	9,766
Unrealized gain from derivatives	11,490
Other income	944	790	499
Interest expense	(64,575)	(42,688)	(29,456)
Total other income (expenses)	(15,754)	(6,780)	(12,428)
Loss before income taxes	(147,414)	(48,096)	(24,432)
Benefit from income taxes	47,354	14,624	4,846
Net loss	$ (100,060)	$ (33,472)	$ (19,586)
Net loss per share:
Basic	$ (2.16)	$ (0.73)	$ (0.43)
Diluted	$ (2.16)	$ (0.73)	$ (0.43)
Weighted average shares outstanding:
Basic	46,422	45,997	45,561
Diluted	46,422	45,997	45,561

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended					12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net loss	$ (78,151)	$ (41,134)	$ 1,309	$ 3,949	$ 2,404	$ (100,060)	$ (33,472)	$ (19,586)
Unrealized hedging gains, net of provision for (benefit from) income taxes of $-, $161 and $(161)						(298)	298
Net change in unrealized gains and losses on marketable securities, net of benefit from (provision for) income taxes of ($923) in 2010, $6,543 in 2011 and $8,487 in 2012						(15,760)	(12,152)	1,711
Other comprehensive income (loss)						(16,058)	(11,854)	1,711
Comprehensive loss						$ (116,118)	$ (45,326)	$ (17,875)

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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- Definition

Net of tax amount, before reclassification adjustments, of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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+ Details

- Definition

Net of tax amount of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities.

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+ Details

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Unrealized hedging gains, income tax provision (benefit)	$ (161)	$ 161
Net change in unrealized gains and losses on marketable securities, income tax benefit (provision)	$ 8,487	$ 6,543	$ (923)

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]
Beginning Balance at Dec. 31, 2009	$ 1,066,111	$ 23,552	$ 434,505	$ 577,435	$ 30,619
Beginning Balance, Shares at Dec. 31, 2009		47,104
Exercise of stock options	1,427	$ 92	1,335
Exercise of stock options, Shares		184
Stock-based compensation	17,377	$ 209	17,168
Stock-based compensation, Shares		418
Excess income taxes from stock-based compensation	1,491		1,491
Net loss	(19,586)			(19,586)
Other comprehensive income (loss)	1,711				1,711
Ending Balance at Dec. 31, 2010	1,068,531	$ 23,853	454,499	557,849	32,330
Ending Balance, shares at Dec. 31, 2010		47,706
Stock-based compensation	15,032	$ 210	14,822
Stock-based compensation, Shares		419
Excess income taxes from stock-based compensation	(612)		(612)
Net loss	(33,472)			(33,472)
Other comprehensive income (loss)	(11,854)				(11,854)
Ending Balance at Dec. 31, 2011	1,037,625	$ 24,063	468,709	524,377	20,476
Ending Balance, shares at Dec. 31, 2011		48,125
Beginning Balance at Dec. 31, 2011	1,037,625	$ 24,063	468,709	524,377	20,476
Beginning Balance, Shares at Dec. 31, 2011		48,125
Beginning Balance at Dec. 31, 2011	1,037,625	$ 24,063	468,709	524,377	20,476
Beginning Balance, Shares at Dec. 31, 2011		48,125
Beginning Balance at Dec. 31, 2011	1,037,625	$ 24,063	468,709	524,377	20,476
Beginning Balance, Shares at Dec. 31, 2011		48,125
Stock-based compensation	13,728	$ 141	13,587
Stock-based compensation, Shares		284
Excess income taxes from stock-based compensation	(1,701)		(1,701)
Net loss	(100,060)			(100,060)
Other comprehensive income (loss)	(16,058)				(16,058)
Ending Balance at Dec. 31, 2012	933,534	$ 24,204	480,595	424,317	4,418
Ending Balance, shares at Dec. 31, 2012		48,409
Net loss	(78,151)
Ending Balance at Dec. 31, 2012	$ 933,534	$ 24,204	$ 480,595	$ 424,317	$ 4,418
Ending Balance, shares at Dec. 31, 2012		48,409

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

- Definition

Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

+ References + Details

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (100,060)	$ (33,472)	$ (19,586)
Adjustments to reconcile net loss to net cash provided by operating activities:
(Gain) loss on sale of assets	(50,892)	(35,061)	10,103
Deferred income taxes	(47,192)	(14,652)	(4,617)
Dry hole costs and leasehold impairments	61,300	9,819
Impairment of oil and gas properties	25,368	60,817	224
Depreciation, depletion and amortization	365,286	290,776	213,809
Unrealized gains from derivatives	(11,490)
Debt issuance cost and discount amortization	5,277	4,300	2,436
Stock-based compensation	13,728	15,032	17,377
Excess income taxes from stock-based compensation	1,701	612	(1,491)
Decrease (increase) in accounts receivable	11,975	(9,046)	(4,432)
Decrease (increase) in other current assets	(4,309)	3,311	48,070
Increase (decrease) in accounts payable and accrued expenses	(8,463)	(7,532)	49,769
Net cash provided by operating activities	262,229	284,904	311,662
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(588,111)	(1,005,503)	(537,400)
Proceeds from sales of oil and gas properties	166,686		66,428
Proceeds from sales of marketable securities	37,705	53,417	30,499
Net cash used for investing activities	(383,720)	(952,086)	(440,473)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings	515,912	970,000	110,000
Principal payments on debt	(390,000)	(287,000)	(68,000)
Debt issuance costs	(6,709)	(8,478)	(4,847)
Proceeds from issuance of common stock			1,427
Excess income taxes from stock-based compensation	(1,701)	(612)	1,491
Net cash provided by financing activities	117,502	673,910	40,071
Net increase (decrease) in cash and cash equivalents	(3,989)	6,728	(88,740)
Cash and cash equivalents, beginning of the year	8,460	1,732	90,472
Cash and cash equivalents, end of the year	$ 4,471	$ 8,460	$ 1,732

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2012

Summary of Significant Accounting Policies

(1) Summary of Significant Accounting Policies

Accounting policies used by Comstock Resources, Inc. reflect oil and natural gas industry practices and conform to accounting principles generally accepted in the United States of America.

Basis of Presentation and Principles of Consolidation

Comstock Resources, Inc. is engaged in oil and natural gas exploration, development and production, and the acquisition of producing oil and natural gas properties. The Company’s operations are primarily focused in Texas and Louisiana. The consolidated financial statements include the accounts of Comstock Resources, Inc. and its wholly owned or controlled subsidiaries (collectively, “Comstock” or the “Company”). During 2011 and 2012 the consolidated financial statements also include the accounts of a variable interest entity where the Company was the primary beneficiary of the arrangements. All significant intercompany accounts and transactions have been eliminated in consolidation. The Company accounts for its undivided interest in oil and gas properties using the proportionate consolidation method, whereby its share of assets, liabilities, revenues and expenses are included in its financial statements.

Reclassifications

Certain reclassifications have been made to prior periods’ financial statements to conform to the current presentation.

Use of Estimates in the Preparation of Financial Statements

The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual amounts could differ from those estimates. Changes in the future estimated oil and natural gas reserves or the estimated future cash flows attributable to the reserves that are utilized for impairment analysis could have a significant impact on the future results of operations.

Concentration of Credit Risk and Accounts Receivable

Financial instruments that potentially subject the Company to a concentration of credit risk consist principally of cash and cash equivalents, accounts receivable and derivative financial instruments. The Company places its cash with high credit quality financial institutions and its derivative financial instruments with financial institutions and other firms that management believes have high credit ratings. Substantially all of the Company’s accounts receivable are due from either purchasers of oil and gas or participants in oil and gas wells for which the Company serves as the operator. Generally, operators of oil and gas wells have the right to offset future revenues against unpaid charges related to operated wells. Oil and gas sales are generally unsecured. The Company’s policy is to assess the collectability of its receivables based upon their age, the credit quality of the purchaser or participant and the potential for revenue offset. The Company has not had any significant credit losses in the past and believes its accounts receivable are fully collectible. Accordingly, no allowance for doubtful accounts has been provided.

Marketable Securities

As of December 31, 2011 and 2012, the Company owned 1,806,000 and 600,000 shares, respectively, of Stone Energy Corporation common stock which was reflected in the consolidated balance sheets as marketable securities. As of December 31, 2011 and 2012, the cost basis of the marketable securities was $16.6 million and $5.5 million, respectively. As of December 31, 2011 and 2012, the estimated fair value of the marketable securities was $47.6 million and $12.3 million, respectively, after recognizing unrealized gain after income taxes of $20.2 million and $4.4 million, respectively. The Company does not exert influence over the operating and financial policies of Stone, and has classified its investment in these shares as an available-for-sale security in the consolidated balance sheets. Available-for-sale securities are accounted for at fair value, with any unrealized gains and unrealized losses not determined to be other than temporary reported in the consolidated balance sheet within accumulated other comprehensive income as a separate component of stockholders’ equity. The Company utilizes the specific identification method to determine the cost of any securities sold. During 2010, 2011 and 2012 the Company sold 1,520,000, 1,991,000 and 1,206,000 shares of Stone common stock for proceeds of $30.5 million, $53.4 million and $37.7 million, respectively. Comstock realized gains before income taxes of $16.5 million, $35.1 million and $26.6 million on these sales during 2010, 2011 and 2012, respectively. The Company reviews its available-for-sale securities to determine whether a decline in fair value below the respective cost basis is other than temporary. Unrealized losses are charged against net earnings when a decline in fair value is determined to be other than temporary.

Other Current Assets

Other current assets at December 31, 2011 and 2012 consist of the following:


	As of December 31,
	2011		2012
	(In thousands)
Pipe and oil field equipment inventory	$	2,314	$	1,922
Production tax refunds receivable		—		1,830
Derivative settlements receivable		—		1,693
Drilling advances		—		1,160
Prepaid expenses		397		300
Other		85		49

	$	2,796	$	6,954

Fair Value Measurements

The Company holds or has held certain items that are required to be measured at fair value. These include cash equivalents held in bank accounts, marketable securities and derivative financial instruments in the form of oil price swap agreements. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. A three-level hierarchy is followed for disclosure to show the extent and level of judgment used to estimate fair value measurements:

Level 1 – Inputs used to measure fair value are unadjusted quoted prices that are available in active markets for the identical assets or liabilities as of the reporting date.

Level 2 – Inputs used to measure fair value, other than quoted prices included in Level 1, are either directly or indirectly observable as of the reporting date through correlation with market data, including quoted prices for similar assets and liabilities in active markets and quoted prices in markets that are not active. Level 2 also includes assets and liabilities that are valued using models or other pricing methodologies that do not require significant judgment since the input assumptions used in the models, such as interest rates and volatility factors, are corroborated by readily observable data from actively quoted markets for substantially the full term of the financial instrument.

Level 3 – Inputs used to measure fair value are unobservable inputs that are supported by little or no market activity and reflect the use of significant management judgment. These values are generally determined using pricing models for which the assumptions utilize management’s estimates of market participant assumptions.

The Company’s cash and marketable securities valuation are based on Level 1 measurements. The Company’s oil and natural gas price swap agreements were not traded on a public exchange, and their value was determined utilizing a discounted cash flow model based on inputs that are readily available in public markets and, accordingly, the valuation of these swap agreements was categorized as a Level 2 measurement.

The following table summarizes financial assets accounted for at fair value as of December 31, 2012:


	Carrying Value Measured at Fair Value at December 31, 2012		Level 1		Level 2
	(In thousands)
Assets measured at fair value on a recurring basis:
Cash held in bank accounts	$	4,471	$	4,471	$	—
Marketable securities		12,312		12,312		—
Derivative financial instruments		11,651		—		11,651

Total assets	$	28,434	$	16,783	$	11,651

As of December 31, 2012 the Company had oil price swap agreements for 2,160,000 barrels of oil to be produced in 2013 with a fair value of $11.7 million. The Company has recognized an asset for this amount, and has recognized corresponding unrealized gain which is included in other income (expenses) during 2012. At December 31, 2011 the Company had oil price swap agreements for 1,440,000 barrels of oil to be produced in 2012 with a fair value of $0.5 million. The Company recognized a current asset for this amount, and recognized an unrealized gain of $0.3 million, net of income taxes of $0.2 million, which was included in other comprehensive income.

The following table summarizes the changes in the fair values of derivative financial instruments, which are Level 2 liabilities, for the years ended December 31, 2010, 2011 and 2012:


	2010		2011		2012
	(In thousands)
Balance beginning of period	$	—	$	—	$	459
Purchases and settlements (net)		—		—		(9,766)
Total realized or unrealized gains:
Realized gains included in earnings		—		—		9,766
Unrealized gains included in earnings		—		—		11,651
Unrealized gains included in other comprehensive income		—		459		(459)

Balance end of period	$	—	$	459	$	11,651

The following table presents the carrying amounts and estimated fair value of the Company’s other financial instruments as of December 31, 2011 and 2012:


	2011				2012
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(In thousands)
Long-term debt, including current portion	$	1,196,908	$	1,167,000	$	1,324,383	$	1,382,000

The fair market value of the Company’s fixed rate debt was based on the market prices as of December 31, 2011 and 2012, a Level 1 measurement. The fair value of the floating rate debt outstanding at December 31, 2011 and 2012 approximated its carrying value, a Level 2 measurement.

Property and Equipment

The Company follows the successful efforts method of accounting for its oil and gas properties. Acquisition costs for proved oil and gas properties, costs of drilling and equipping productive wells, and costs of unsuccessful development wells are capitalized and amortized on an equivalent unit-of-production basis over the life of the remaining related oil and gas reserves. Equivalent units are determined by converting oil to natural gas at the ratio of one barrel of oil for six thousand cubic feet of natural gas. This conversion ratio is not based on the price of oil or natural gas, and there may be a significant difference in price between an equivalent volume of oil versus natural gas. Cost centers for amortization purposes are determined on a field area basis. Costs incurred to acquire oil and gas leasehold are capitalized. The estimated future costs of dismantlement, restoration, plugging and abandonment of oil and gas properties and related facilities disposal are capitalized when asset retirement obligations are incurred and amortized as part of depreciation, depletion and amortization expense. The costs of unproved properties which are determined to be productive are transferred to proved oil and gas properties and amortized on an equivalent unit-of-production basis. Exploratory expenses, including geological and geophysical expenses and delay rentals for unevaluated oil and gas properties, are charged to expense as incurred. Unproved oil and gas properties are periodically assessed for impairment on a property by property basis, and any impairment in value is charged to exploration expense. During 2011 and 2012, impairment charges of $9.8 million and $61.3 million, respectively, were recognized in exploration expense related to certain leases that the Company no longer expects to drill on. Exploratory drilling costs are initially capitalized as unproved property but charged to expense if and when the well is determined not to have found commercial quantities of proved oil and gas reserves. Exploratory drilling costs are evaluated within a one-year period after the completion of drilling.

The Company periodically assesses the need for an impairment of the costs capitalized for its oil and gas properties on a property or cost center basis. If impairment is indicated based on undiscounted expected future cash flows attributable to the property, then a provision for impairment is recognized to the extent that net capitalized costs exceed the estimated fair value of the property. The fair value is based upon estimated discounted future cash flows which are derived from Level 3 inputs. Expected future cash flows are determined using estimated future prices based on market based forward prices applied to projected future production volumes. Costs are also projected to escalate at a rate that is based upon the Company’s historical experience. The projected production volumes are based on the property’s proved and risk adjusted probable oil and natural gas reserve estimates at the end of the period. The oil and natural gas prices used for determining asset impairments will generally differ from those used in the standardized measure of discounted future net cash flows because the standardized measure requires the use of an average price based on the first day of each month of the preceding year and is limited to proved reserves. The Company recognized impairment charges related to its oil and gas properties of $0.2 million, $60.8 million and $25.4 million in 2010, 2011, and 2012, respectively.

Other property and equipment consists primarily of gas gathering systems, computer equipment, furniture and fixtures and an airplane which are depreciated over estimated useful lives ranging from three to 31¹/₂ years on a straight-line basis.

Other Assets

Other assets primarily consist of deferred costs associated with issuance of the Company’s senior notes and bank credit facility. These costs are amortized over the life of the senior notes and the life of the bank credit facility on a straight-line basis which approximates the amortization that would be calculated using an effective interest rate method.

Accrued Expenses

Accrued expenses at December 31, 2011 and 2012 consist of the following:


	As of December 31,
	2011		2012
	(In thousands)
Accrued drilling costs	$	29,291	$	14,050
Accrued interest payable		11,113		12,351
Advance from joint venture partner		—		7,286
Accrued oil and gas property acquisition costs		31,988		2,413
Other		13,110		11,272

	$	85,502	$	47,372

Reserve for Future Abandonment Costs

The Company’s asset retirement obligations relate to future plugging and abandonment costs of its oil and gas properties and related facilities disposal. The Company records a liability in the period in which an asset retirement obligation is incurred, in an amount equal to the discounted estimated fair value of the obligation that is capitalized. Thereafter, this liability is accreted up to the final retirement cost. Accretion of the discount is included as part of depreciation, depletion and amortization in the accompanying consolidated financial statements.

The following table summarizes the changes in the Company’s total estimated liability:


	2010			2011			2012
	(In thousands)
Reserve for Future Abandonment Costs at beginning of the year	$	6,561		$	6,674		$	13,997
New wells placed on production		338			417			1,837
Changes in estimates		596			5,839			2,736
Acquisition liabilities assumed		—			741			—
Liabilities settled and assets disposed of		(1,212	)		(56	)		(1,304	)
Accretion expense		391			382			728

Reserve for Future Abandonment Costs at end of the year	$	6,674		$	13,997		$	17,994

Stock-based Compensation

The Company has stock-based employee compensation plans under which stock awards, comprised of restricted stock, stock options and performance share units are issued to employees and non-employee directors. The Company follows the fair value based method in accounting for equity-based compensation. Under the fair value based method, compensation cost is measured at the grant date based on the fair value of the award and is recognized on a straight-line basis over the award vesting period. Excess tax benefits on stock-based compensation are recognized as an adjustment to additional paid-in capital and as a part of cash flows from financing activities.

Segment Reporting

The Company presently operates in one business segment, the exploration and production of oil and natural gas.

Derivative Instruments and Hedging Activities

The Company accounts for derivative instruments (including certain derivative instruments embedded in other contracts) as either an asset or liability measured at its fair value. Changes in the fair value of derivatives are recognized currently in earnings unless specific hedge accounting criteria are met. The Company estimates fair value based on a discounted cash flow model and quotes obtained from the counterparties to the derivative contract. The fair value of derivative contracts that expire in less than one year are recognized as current assets or liabilities. Those that expire in more than one year are recognized as long-term assets or liabilities. Derivative financial instruments that are not accounted for as hedges are adjusted to fair value through income. If the derivative is designated as a cash flow hedge, changes in fair value are recognized in other comprehensive income until the hedged item is recognized in earnings.

Major Purchasers

In 2012 the Company had two purchasers of its oil and natural gas production that accounted for 42% and 27%, respectively, of total oil and gas sales. In 2011 the Company had two purchasers of its oil and natural gas production that accounted for 49% and 14%, respectively, of total oil and gas sales. In 2010 the Company had one purchaser of its oil and natural gas production that accounted for 39% of total oil and gas sales. The loss of any of these customers would not have a material adverse effect on the Company as there is an available market for its oil and natural gas production from other purchasers.

Revenue Recognition and Gas Balancing

Comstock utilizes the sales method of accounting for oil and natural gas revenues whereby revenues are recognized at the time of delivery based on the amount of oil or natural gas sold to purchasers. Revenue is typically recorded in the month of production based on an estimate of the Company’s share of volumes produced and prices realized. Revisions to such estimates are recorded as actual results are known. The amount of oil or natural gas sold may differ from the amount to which the Company is entitled based on its revenue interests in the properties. The Company did not have any significant imbalance positions at December 31, 2011 or 2012. Sales of oil and natural gas generally occur at the wellhead. When sales of oil and gas occur at locations other than the wellhead, the Company accounts for costs incurred to transport the production to the delivery point as operating expenses.

General and Administrative Expenses

General and administrative expenses are reported net of reimbursements of overhead costs that are received from working interest owners of the oil and gas properties operated by the Company of $10.6 million, $10.5 million and $11.5 million in 2010, 2011 and 2012, respectively.

Income Taxes

The Company accounts for income taxes using the asset and liability method, whereby deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of assets and liabilities and their respective tax basis, as well as the future tax consequences attributable to the future utilization of existing tax net operating loss and other types of carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences and carryforwards are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that the change in rate is enacted.

Earnings Per Share

Basic earnings per share is determined without the effect of any outstanding potentially dilutive stock options and diluted earnings per share is determined with the effect of outstanding stock options that are potentially dilutive. Unvested share-based payment awards containing nonforfeitable rights to dividends are considered to be participatory securities and included in the computation of basic and diluted earnings per share pursuant to the two-class method. Performance share units (“PSUs”) represent the right to receive a number of shares of the Company’s common stock that may range from zero to up to three times the number of PSUs granted on the award date based on the achievement of certain performance measures during a performance period. The number of potentially dilutive shares related to PSUs is based on the number of shares, if any, which would be issuable at the end of the respective period, assuming that date was the end of the contingency period. The treasury stock method is used to measure the dilutive effect of PSUs.

Basic and diluted earnings per share for 2010, 2011 and 2012 were determined as follows:


	2010								2011								2012
	Loss			Shares		Per Share			Loss			Shares		Per Share			Loss			Shares		Per Share
	(In thousands except per share data)
Net Loss	$	(19,586	)						$	(33,472	)						$	(100,060	)
Income Allocable to Unvested Stock Grants		—								—								—

Basic Net Loss Attributable to Common Stock	$	(19,586	)		45,561	$	(0.43	)	$	(33,472	)		45,997	$	(0.73	)	$	(100,060	)		46,422	$	(2.16	)

Effect of Dilutive Securities:
Stock Options		—			—					—			—					—			—
Performance Stock Units		—			—					—			—					—			—

Diluted Net Loss Attributable to Common Stock	$	(19,586	)		45,561	$	(0.43	)	$	(33,472	)		45,997	$	(0.73	)	$	(100,060	)		46,422	$	(2.16	)

At December 31, 2010, 2011 and 2012, 2,069,275, 2,114,520 and 1,960,835 shares of unvested restricted stock, respectively, are included in common stock outstanding as such shares have a nonforfeitable right to participate in any dividends that might be declared and have the right to vote. Weighted average shares of unvested restricted stock included in common stock outstanding were as follows:

2010

2011

2012

(In thousands)

Unvested restricted stock

1,715

1,683

1,737

All stock options, unvested stock and PSUs were anti-dilutive to earnings and excluded from weighted average shares used in the computation of earnings per share due to the net loss in each period.

Options to purchase common stock that were outstanding and that were excluded as anti-dilutive from determination of diluted earnings per share were as follows:


	2010		2011		2012
	(In thousands except per share data)
Weighted average anti-dilutive stock options		240		215		168
Weighted average exercise price	$	35.98	$	36.42	$	37.81

Supplementary Information With Respect to the Consolidated Statements of Cash Flows

For the purpose of the consolidated statements of cash flows, the Company considers all highly liquid investments purchased with an original maturity of three months or less to be cash equivalents.

Cash payments made for interest and income taxes for the years ended December 31, 2010, 2011 and 2012, respectively, were as follows:


	2010			2011			2012
	(In thousands)
Cash Payments:
Interest payments	$	40,467		$	49,109		$	79,001
Income tax refunds	$	(48,575	)	$	(1,403	)	$	(58	)

The Company capitalizes interest on its unevaluated oil and gas property costs during periods when it is conducting exploration activity on this acreage. The Company capitalized interest of $13.0 million, $13.2 million and $20.9 million in 2010, 2011 and 2012, respectively, which reduced interest expense and increased the carrying value of its unevaluated oil and gas properties.

Comprehensive Loss

Comprehensive loss consists of the following:


	For the Year Ended December 31,
	2010			2011			2012
	(In thousands)
Net Loss	$	(19,586	)	$	(33,472	)	$	(100,060	)
Other comprehensive income (loss):
Realized gains on marketable securities reclassified to earnings, net of provision for income taxes of ($5,785) in 2010, ($12,291) in 2011 and ($9,318) in 2012		(10,744	)		(22,827	)		(17,303	)
Unrealized hedging gains, net of provision for (benefit from) income taxes of $161 in 2011 and ($161) in 2012		—			298			(298	)
Unrealized gains on marketable securities, net of provision for income taxes of $6,707 in 2010, $5,748 in 2011 and $831 in 2012		12,455			10,675			1,543

Total comprehensive loss	$	(17,875	)	$	(45,326	)	$	(116,118	)

The following table provides a summary of the amounts included in accumulated other comprehensive income, net of income taxes, for the years ended December 31, 2010, 2011 and 2012:


	Oil Price Swap Agreements			Marketable Securities			Total Accumulated Comprehensive Income
	(In thousands)
Balance as of December 31, 2009	$	—		$	30,619		$	30,619
Reclassification to earnings		—			(10,744	)		(10,744	)
Changes in value		—			12,455			12,455

Balance as of December 31, 2010		—			32,330			32,330
Reclassification to earnings		—			(22,827	)		(22,827	)
Changes in value		298			10,675			10,973

Balance as of December 31, 2011		298			20,178			20,476
Reclassification to earnings		(298	)		(17,303	)		(17,601	)
Changes in value		—			1,543			1,543

Balance as of December 31, 2012	$	—		$	4,418		$	4,418

Subsequent Events

Subsequent events were evaluated through the issuance date of these consolidated financial statements.

Acquisitions and Dispositions of Oil and Gas Properties

12 Months Ended

Dec. 31, 2012

Acquisitions and Dispositions of Oil and Gas Properties

(2) Acquisitions and Dispositions of Oil and Gas Properties

On December 29, 2011, the Company completed an acquisition, from an unrelated party, of oil and gas properties in the Delaware Basin located in Reeves County in West Texas (the “Delaware Basin Acquisition”). Total cash consideration paid of $337.9 million was funded with borrowings under the Company’s bank credit facility. The Company acquired proved oil and gas reserves of 25.2 million barrels of oil equivalent and leases covering 43,591 net acres. The effective date of the acquisition was November 1, 2011. Concurrent with the Delaware Basin Acquisition, Comstock entered into a transaction structured as a reverse like-kind exchange in accordance with Section 1031 of the Internal Revenue Code. In connection with this reverse like-kind exchange, Comstock assigned the right to acquire ownership in the oil and gas properties that were acquired to a variable interest entity formed by an exchange accommodation titleholder. Comstock operated these properties pursuant to lease and management agreements with that entity, and had a call option which allowed the Company to terminate the exchange transaction at any time up and until the expiration date of the exchange. The exchange transaction was completed in May 2012 and the variable interest entity was then merged into a wholly owned subsidiary of the Company. Because the Company was the primary beneficiary of these arrangements, the properties acquired are included in its consolidated balance sheet as of December 31, 2011, and all revenues earned and expenses incurred related to the properties were included in the Company’s consolidated results of operations during the term of the agreements.

The purchase price allocation, including final post-closing adjustments finalized during 2012, was as follows:


	(In thousands)
Consideration paid:
Cash	$	337,896

Total consideration paid	$	337,896

Amounts recognized for the fair value of assets acquired and liabilities assumed were as follows:


	(In thousands)
Proved properties	$	205,758
Unproved properties		143,751
Asset retirement obligation		(741	)
Liabilities assumed		(10,872	)

Net fair value of properties acquired and liabilities assumed	$	337,896

On December 30, 2011, the Company acquired oil and gas properties in North Louisiana from a third party for $27.1 million. This acquisition included proved oil and gas reserves of 13 billion cubic feet of natural gas equivalent and leases covering 3,500 net acres.

Comstock considered the property acquisitions as business combinations and estimated the fair value of the properties as of the acquisition date. To estimate the fair value of the properties, the Company used a net asset value approach. The Company utilized a discounted cash flow model that took into account the following inputs to arrive at estimates of future net cash flows:

•

Estimated ultimate recovery of oil and natural gas;

•

Estimated future commodity prices based on NYMEX oil and natural gas futures prices adjusted for estimated location and quality differentials as well as related transportation costs;

•

Estimated future production rates; and

•

Estimated timing and amounts of future operating and development costs.

To estimate the fair value of proved properties, the Company discounted the future net cash flows using a market-based rate that the Company determined appropriate at the acquisition date for the various proved reserve categories. Due to the unobservable nature of the inputs, the fair values of the proved and unproved oil and gas properties are considered Level 3 fair value measurements.

During 2012, the Company completed the sale of certain oil and gas properties located in Tyler and Polk counties in South Texas and Lincoln Parish in North Louisiana. The Company received aggregate net proceeds of $119.8 million and recognized a total gain of $26.0 million from these transactions. Also during 2012, the Company completed the sale of certain non-operated oil and gas properties acquired as part of the Delaware Basin Acquisition and received net proceeds of $24.8 million. The Company accounted for the disposal of these properties as a retirement since they represented a small portion of the assets within one of its major oil and gas properties.

On July 30, 2012, the Company entered into a participation agreement with Kohlberg Kravis Roberts & Co L.P. (together with its affiliates, “KKR”) providing for the participation of KKR in Comstock’s future development of its Eagle Ford shale properties in South Texas. Under the terms of the participation agreement, KKR has the right to participate for one-third of Comstock’s working interest in wells drilled on the Company’s 28,160 net acres in exchange for KKR paying $25,000 per acre for the net acreage being acquired and one-third of the wells costs. Each well that KKR participates in is intended to earn KKR approximately one-third of the Company’s working interest in approximately 80 acres. The agreement applies to wells spud by the Company on or subsequent to March 31, 2012. The Company retains all of its interest in wells that were spud prior to March 31, 2012. Subject to certain conditions, KKR is obligated to acquire acreage for the first 100 wells drilled on the Company’s Eagle Ford Shale acreage after July 30, 2012 and can continue to participate in additional wells drilled on the acreage under the same terms. Comstock received $23.8 million from KKR to fund its participation in drilling activity before the closing on July 30, 2012. During 2012 the Company also received $8.7 million for acreage and facility costs for new wells drilled subsequent to the closing. The Company accounted for the receipt of these funds as a retirement since they represented a small portion of the costs within one of its major oil and gas properties. Formation costs of $1.7 million incurred in connection with this joint venture are reflected as a reduction to the realized gain on sale of oil and gas properties in the consolidated financial statements.

- Definition

The entire disclosure for long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. This disclosure may include property plant and equipment accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives, income statement disclosures, assets held for sale and public utility disclosures.

+ References + Details

Oil and Gas Producing Activities

12 Months Ended

Dec. 31, 2012

Oil and Gas Producing Activities

(3) Oil and Gas Producing Activities

Set forth below is certain information regarding the aggregate capitalized costs of oil and gas properties and costs incurred by the Company for its oil and gas property acquisition, development and exploration activities:

Capitalized Costs


	As of December 31,
	2011			2012
	(In thousands)
Unproved properties	$	369,096		$	263,652
Proved properties:
Leasehold costs		1,162,094			1,125,460
Wells and related equipment and facilities		2,314,052			2,654,256
Accumulated depreciation depletion and amortization		(1,349,871	)		(1,588,046	)

	$	2,495,371		$	2,455,322

Costs Incurred


	For the Years Ended December 31,
	2010		2011		2012
	(In thousands)
Property Acquisitions:
Unproved property acquisitions	$	134,728	$	255,699	$	29,677
Proved property acquisitions		—		219,402		3,235
Development costs		315,041		496,506		514,629
Exploration costs		87,823		83,182		5,522

	$	537,592	$	1,054,789	$	553,063

Long-term Debt

12 Months Ended

Dec. 31, 2012

Long-term Debt

(4) Long-term Debt

Long-term debt is comprised of the following:


	As of December 31,
	2011			2012
	(In thousands)
Bank credit facility	$	600,000		$	440,000
8³/₈% senior notes due 2017		300,000			300,000
Discount related to 8³/₈% senior notes due 2017		(3,092	)		(2,556	)
7³/₄% senior notes due 2019		300,000			300,000
9¹/₂% senior notes due 2020		—			300,000
Discount related to 9¹/₂% senior notes due 2020		—			(13,061	)

	$	1,196,908		$	1,324,383

The discount on the 8³/₈% and 9¹/₂% senior notes are being amortized over the life of the senior notes using the effective interest rate method.

The following table summarizes Comstock’s debt as of December 31, 2012 by year of maturity:


	2013		2014		2015		2016		2017		Thereafter		Total
	(In thousands)
Bank credit facility	$	—	$	—	$	440,000	$	—	$	—	$	—	$	440,000
8³/₈% senior notes		—		—		—		—		297,444		—		297,444
7³/₄% senior notes		—		—		—		—		—		300,000		300,000
9¹/₂% senior notes		—		—		—		—		—		286,939		286,939

	$	—	$	—	$	440,000	$	—	$	297,444	$	586,939	$	1,324,383

Comstock has a $850.0 million bank credit facility with Bank of Montreal, as the administrative agent. The credit facility is a five year revolving credit commitment that matures on November 30, 2015. Indebtedness under the credit facility is secured by substantially all of Comstock’s assets and is guaranteed by all of its wholly owned subsidiaries. The credit facility is subject to borrowing base availability, which is redetermined semiannually based on the banks’ estimates of the Company’s future net cash flows of oil and natural gas properties. The borrowing base may be affected by the performance of Comstock’s properties and changes in oil and natural gas prices. The determination of the borrowing base is at the sole discretion of the administrative agent and the bank group. As of December 31, 2012, the borrowing base was $570.0 million, $130.0 million of which was available. Borrowings under the credit facility bear interest, based on the utilization of the borrowing base, at Comstock’s option at either (1) LIBOR plus 1.75% to 2.75% or (2) the base rate (which is the higher of the administrative agent’s prime rate, the federal funds rate plus 0.5% or 30 day LIBOR plus 1.0%) plus 0.75% to 1.75%. A commitment fee of 0.5% is payable annually on the unused borrowing base. The credit facility contains covenants that, among other things, restrict the payment of cash dividends in excess of $50.0 million, limit the amount of consolidated debt that Comstock may incur and limit the Company’s ability to make certain loans and investments. The only financial covenants are the maintenance of a ratio of current assets, including availability under the bank credit facility, to current liabilities and maintenance of a leverage ratio. The Company was in compliance with these covenants as of December 31, 2012.

On June 5, 2012 the Company issued $300.0 million of senior notes (the “2020 Notes”) pursuant to an underwritten public offering. The 2020 Notes are due on June 15, 2020 and bears interest at 9¹/₂%, which is payable semi-annually on each June 15 and December 15. Proceeds from the issuance of the 2020 Notes were used to pay down outstanding borrowings under the Company’s bank credit facility. On March 14, 2011, Comstock issued $300.0 million of senior notes (the “2019 Notes”) pursuant to an underwritten public offering. The 2019 Notes are due on April 1, 2019 and bear interest at 7³/₄%, which is payable semiannually on each April 1 and October 1. Comstock also has $300.0 million of 8³/₈% senior notes outstanding which mature on October 15, 2017 (the “2017 Notes”). Interest on the 2017 Notes is payable semiannually on each April 15 and October 15. The 2017, 2019 and 2020 Notes are unsecured obligations of Comstock and are guaranteed by all of Comstock’s material subsidiaries. Such subsidiary guarantors are 100% owned and all of the guarantees are full and unconditional and joint and several obligations. As of December 31, 2012, Comstock had no material assets or operations which are independent of its subsidiaries. There are no restrictions on the ability of Comstock to obtain funds from its subsidiaries through dividends or loans.

On January 1, 2011, Comstock had $172.0 million in principal amount of 6⁷/₈% senior notes outstanding due in 2012 (the “2012 Notes”). Comstock redeemed all of the 2012 Notes in March 2011 for $172.4 million. The early extinguishment of the 2012 Notes resulted in a loss of $1.1 million which is included in interest expense in the consolidated financial statements. This loss is comprised of the premium paid for the redemption of the 2012 Notes, the costs incurred related to the tender offer, and the write-off of unamortized debt issuance costs related to the 2012 Notes.

Commitments and Contingencies

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies

(5) Commitments and Contingencies

Commitments

The Company rents office space and other facilities under noncancelable operating leases. Rent expense for the years ended December 31, 2010, 2011 and 2012 was $1.3 million, $1.1 million and $1.4 million, respectively. Minimum future payments under the leases are as follows:


	(In thousands)
2013	$	1,983
2014		2,012
2015		2,038
2016		1,994
2017		2,021
Thereafter		6,740

	$	16,788

As of December 31, 2012, the Company had commitments for contracted drilling rigs of $65.3 million through November 2015.

The Company has entered into natural gas transportation agreements through July 2019. Maximum commitments under these transportation agreements as of December 31, 2012 totaled $25.3 million.

Contingencies

From time to time, the Company is involved in certain litigation that arises in the normal course of its operations. The Company records a loss contingency for these matters when it is probable that a liability has been incurred and the amount of the loss can be reasonably estimated. The Company does not believe the resolution of these matters will have a material effect on the Company’s financial position or results of operations and no material amounts are accrued relative to these matters at December 31, 2011 or 2012.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Stockholders' Equity

12 Months Ended

Dec. 31, 2012

Stockholders' Equity

(6) Stockholders’ Equity

The authorized capital stock of Comstock consists of 75 million shares of common stock, $.50 par value per share, and 5 million shares of preferred stock, $10.00 par value per share. The preferred stock may be issued in one or more series, and the terms and rights of such stock will be determined by the Board of Directors. There were no shares of preferred stock outstanding at December 31, 2011 or 2012.

- Definition

The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-Section 50
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Publisher FASB
-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Section B
-Paragraph 7, 11A
-Chapter 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph d
-Article 4

Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 20: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Article 4

Reference 21: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
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Reference 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 23: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

+ Details

Stock-based Compensation

12 Months Ended

Dec. 31, 2012

Stock-based Compensation

(7) Stock-based Compensation

The Company grants restricted shares of common stock, stock options and performance share units to key employees and directors as part of their compensation under the 2009 Long-term Incentive Plan. Future awards of stock options, restricted stock grants or other equity awards under the 2009 Long-term Incentive Plan are available with up to 1,607,372 shares of common stock.

During 2010, 2011 and 2012, the Company had $17.4 million, $15.0 million and $13.7 million, respectively, in stock-based compensation expense which is in general and administrative expenses. The excess income tax benefit realized from tax deductions associated with stock-based compensation recognized in additional paid in capital totaled $1.5 million in 2010 and excess tax provisions from tax deductions associated with stock-based compensation of $0.6 million and $1.7 million were recognized in additional paid in capital for the years ended December 31, 2011 and 2012, respectively.

Stock Options

The Company amortizes the fair value of stock options granted over the vesting period using the straight-line method. Compensation expense recognized for outstanding stock options was $0.4 million for the year ended December 31, 2010.

The Company has not issued any stock options since 2008. The following table summarizes information related to stock options outstanding at December 31, 2012:


Exercise Price	Weighted Average Remaining Life (in years)		Number of Options Outstanding		Number of Options Exercisable
$32.50		2.9		51,500		51,500
$33.22		4.0		65,650		65,650
$54.36		0.4		40,000		40,000

				157,150		157,150

The following table summarizes information related to stock option activity under the Company’s incentive plans for the year ended December 31, 2012:


	Number of Options			Weighted Average Exercise Price
Outstanding at January 1, 2012		203,150		$	36.64
Expired and forfeited		(46,000	)	$	30.74

Outstanding at December 31, 2012		157,150		$	38.36

Vested and Exercisable at December 31, 2012		157,150		$	38.36


	2010		2011		2012
	(In thousands)
Cash received for options exercised	$	1,427	$	—	$	—
Actual tax benefit realized	$	4,221	$	—	$	—

As of December 31, 2012, all compensation cost related to stock options had been recognized. Stock options outstanding at December 31, 2011 and 2012 had no intrinsic value based on the closing price for the Company’s common stock on December 31, 2011 and December 31, 2012. There were no stock option exercises in 2011 or 2012.

Restricted Stock

The fair value of restricted stock grants is amortized over the vesting period, generally one to four years, using the straight-line method. Total compensation expense recognized for restricted stock grants was $17.0 million, $15.0 million and $13.5 million for the years ended December 31, 2010, 2011 and 2012, respectively. The fair value of each restricted share on the date of grant is equal to its fair market price. A summary of restricted stock activity for the year ended December 31, 2012 is presented below:


	Number of Restricted Shares			Weighted Average Grant Price
Outstanding at January 1, 2012		2,114,520		$	31.25
Granted		303,530		$	15.49
Vested		(437,123	)	$	35.07
Forfeitures		(20,092	)	$	26.10

Outstanding at December 31, 2012		1,960,835		$	28.01

The per share weighted average fair value of restricted stock grants in 2010, 2011 and 2012 was $25.61, $18.31 and $15.49, respectively. Total unrecognized compensation cost related to unvested restricted stock of $19.1 million as of December 31, 2012 is expected to be recognized over a period of 2.3 years. The fair value of restricted stock which vested in 2010, 2011 and 2012 was $15.1 million, $9.3 million and $6.7 million, respectively.

Performance Share Units

The Company issues PSUs as part of its long-term equity incentive compensation. PSU awards can result in the issuance of common stock to the holder if certain performance criteria is met during a performance period. The performance periods consist of one year, two years and three years, respectively. The performance criteria for the PSUs are based on the Company’s annualized total stockholder return (“TSR”) for the performance period as compared with the TSR of certain peer companies for the performance period. The costs associated with PSUs are recognized as general and administrative expense over the performance periods of the awards.

The fair value of PSUs was measured at the grant date using a stochastic process method utilizing the Geometric Brownian Motion Model (“GBM Model”). A stochastic process is a mathematically defined equation that can create a series of outcomes over time. These outcomes are not deterministic in nature, which means that by iterating the equations multiple times, different results will be obtained for those iterations. In the case of the Company’s PSUs, the Company cannot predict with certainty the path its stock price or the stock prices of its peers will take over the future performance periods. By using a stochastic simulation, the Company can create multiple prospective total return pathways, statistically analyze these simulations, and ultimately make inferences to the most likely path the total return will take. As such, because future stock returns are stochastic, or probabilistic with some direction in nature, the stochastic method, specifically the GBM Model, is deemed an appropriate method by which to determine the fair value of the PSUs. Significant assumptions used in this simulation include the Company’s expected volatility and a risk-free interest rate based on U.S. Treasury yield curve rates with maturities consistent with the vesting periods, as well as the volatilities for each of the Company’s peers. For the PSUs granted in 2012, the valuation inputs included a risk-free interest rate of 0.4% and a range of volatilities of 29% to 70%.

The Company granted 254,133 PSUs in 2012, all of which were outstanding at December 31, 2012, with a grant date fair value of $5.4 million, or $21.14 per unit. The number of awards assumes a one multiplier. The final number of shares of common stock issued may vary depending upon the performance multiplier, and can result in the issuance of zero to 688,545 shares of common stock based on the achieved performance ranges from zero to three.

Total compensation expense for PSUs was $0.2 million for the year ended December 31, 2012. As of December 31, 2012, there was $5.2 million of total unrecognized expense related to PSUs, which is being amortized through December 2015.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 718
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-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65, A240
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 93-6
-Paragraph 53
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Retirement Plan	12 Months Ended
Retirement Plan	Dec. 31, 2012
Retirement Plan	(8) Retirement Plan The Company has a 401(k) profit sharing plan which covers all of its employees. At its discretion, Comstock may match a certain percentage of the employees’ contributions to the plan. Matching contributions to the plan were $341,000, $323,000 and $365,000 for the years ended December 31, 2010, 2011 and 2012, respectively.

- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Implementation Guide (Q and A)
-Number FAS88
-Paragraph 63
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-2
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 8
-Subparagraph m
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7, 21, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS106-2
-Paragraph 20, 21, 22
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 30
-Paragraph 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Income Taxes

12 Months Ended

Dec. 31, 2012

Income Taxes

(9) Income Taxes

The following is an analysis of the consolidated income tax benefit:


	2010			2011			2012
	(In thousands)
Current	$	(229	)	$	28		$	(162	)
Deferred		(4,617	)		(14,652	)		(47,192	)

	$	(4,846	)	$	(14,624	)	$	(47,354	)

Deferred income taxes are provided to reflect the future tax consequences or benefits of differences between the tax basis of assets and liabilities and their reported amounts in the financial statements using enacted tax rates. The difference between the Company’s customary rate of 35% and the effective tax rate on income before income taxes is due to the following:


	2010			2011			2012
	(In thousands)
Tax benefit at statutory rate	$	(8,551	)	$	(16,834	)	$	(51,595	)
Tax effect of:
Nondeductible compensation		4,253			2,753			2,545
State taxes, net of federal tax benefit		(343	)		(741	)		1,486
Net operating loss carryback adjustments		(369	)		—			—
Other		164			198			210

Total	$	(4,846	)	$	(14,624	)	$	(47,354	)


	2010			2011			2012
Statutory rate		35.0	%		35.0	%		35.0	%
Tax effect of:
Nondeductible compensation		(17.4	)		(5.7	)		(1.7	)
State taxes, net of federal tax benefit		1.4			1.5			(1.0	)
Net operating loss carryback adjustments		1.5			—			—
Other		(0.7	)		(0.4	)		(0.2	)

Effective tax rate		19.8	%		30.4	%		32.1	%

The tax effects of significant temporary differences representing the net deferred tax asset and liability at December 31, 2011 and 2012 were as follows:


	2011			2012
	(In thousands)
Current deferred tax liabilities:
Marketable securities	$	(7,503	)	$	(1,262	)
Derivative financial instruments		(161	)		(4,078	)

Net current deferred tax liability		(7,664	)		(5,340	)

Noncurrent deferred tax liabilities:
Property and equipment		(253,580	)		(247,062	)
Other assets		8,772			8,319
Net operating loss carryforwards		47,320			95,180
Alternative minimum tax carryforward		19,093			19,080
Valuation allowance on net operating loss carryforwards		(19,630	)		(23,009	)
Other		(3,680	)		(2,409	)

Net noncurrent deferred tax liability		(201,705	)		(149,901	)

Net deferred tax liability	$	(209,369	)	$	(155,241	)

At December 31, 2012, Comstock had the following carryforwards available to reduce future income taxes:


Types of Carryforward	Years of Expiration Carryforward	Amount
		(In thousands)
Net operating loss — U.S. federal	2017 — 2032	$	192,255
Net operating loss — Louisiana	2012 — 2027	$	536,365
Alternative minimum tax credits	Unlimited	$	19,080

Utilization of $36.9 million of the U.S. federal net operating loss carryforwards is limited to approximately $1.1 million per year pursuant to a prior change of control of an acquired company, and a valuation allowance of $23.0 million, with a tax effect of $8.0 million, has been established for the estimated U.S. federal net operating loss carryforwards that will not be utilized. Realization of the remaining U.S. federal net operating loss carryforwards requires Comstock to generate taxable income within the carryforward period. A valuation allowance of $288.0 million, with a tax effect of $15.0 million, has been established against the Louisiana state net operating loss carryforwards due to the uncertainty of generating taxable income in the state of Louisiana prior to the expiration of the carryforward period.

The Company’s federal income tax returns for the years subsequent to December 31, 2007 remain subject to examination. The Company’s income tax returns in major state income tax jurisdictions remain subject to examination for various periods subsequent to December 31, 2007. State tax returns in two state jurisdictions are currently under review. The Company currently believes that resolution of these matters will not have a material impact on its financial statements. The Company currently believes that its significant filing positions are highly certain and that all of its other significant income tax filing positions and deductions would be sustained upon audit or the final resolution would not have a material effect on the consolidated financial statements. Therefore, the Company has not established any significant reserves for uncertain tax positions. Interest and penalties resulting from audits by tax authorities have been immaterial and are included in the provision for income taxes in the consolidated statements of operations.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

+ Details

Derivative Financial Instruments and Hedging Activities

12 Months Ended

Dec. 31, 2012

Derivative Financial Instruments and Hedging Activities

(10) Derivative Financial Instruments and Hedging Activities

Comstock periodically uses swaps, floors and collars to hedge oil and natural gas prices and interest rates. Swaps are settled monthly based on differences between the prices specified in the instruments and the settlement prices of futures contracts. Generally, when the applicable settlement price is less than the price specified in the contract, Comstock receives a settlement from the counterparty based on the difference multiplied by the volume or amounts hedged. Similarly, when the applicable settlement price exceeds the price specified in the contract, Comstock pays the counterparty based on the difference. Comstock generally receives a settlement from the counterparty for floors when the applicable settlement price is less than the price specified in the contract, which is based on the difference multiplied by the volumes hedged. For collars, generally Comstock receives a settlement from the counterparty when the settlement price is below the floor and pays a settlement to the counterparty when the settlement price exceeds the cap. No settlement occurs when the settlement price falls between the floor and cap.

During 2012, the Company hedged 1,710,000 barrels of its oil production at an average NYMEX West Texas Intermediate (“WTI”) oil price of $99.46 per barrel. As of December 31, 2012, the Company had the following outstanding commodity derivatives:

Commodity and Derivative Type

Weighted-
Average
Contract Price

Volume
(Barrels)

Contract Period

Oil Price Swap Agreements

98.67 per Bbl.

2,160,000

Jan. 2013 – Dec. 2013

The Company recognizes the realized gains and losses, and the unrealized gains and losses due to the change in the fair value of its derivative financial instruments, as separate components of other income (expenses). The Company had realized gains of $9.8 million on its oil swaps that settled during 2012. The estimated fair value of the Company’s derivative financial instruments, which equals their carrying value, was an asset of $11.7 million as of December 31, 2012, which is reflected as a current asset based on estimated settlement dates.

- Definition

The entire disclosure for the entity's entire derivative instruments and hedging activities. Describes an entity's risk management strategies, derivatives in hedging activities and non-hedging derivative instruments, the assets, obligations, liabilities, revenues and expenses arising therefrom, and the amounts of and methodologies and assumptions used in determining the amounts of such items.

+ References

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+ Details

Supplementary Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2012

Supplementary Quarterly Financial Data (Unaudited)

(11) Supplementary Quarterly Financial Data (Unaudited)


	2011
	First			Second			Third			Fourth			Total
	(In thousands, except per share data)
Total oil and gas sales	$	88,038		$	112,451		$	119,422		$	114,456		$	434,367

Income (loss) from operations	$	(8,263	)	$	8,378		$	12,086		$	(53,517	)	$	(41,316	)

Net income (loss)	$	2,404		$	3,949		$	1,309		$	(41,134	)	$	(33,472	)

Net income (loss) per share:
Basic	$	0.05		$	0.08		$	0.03		$	(0.89	)	$	(0.73	)
Diluted	$	0.05		$	0.08		$	0.03		$	(0.89	)	$	(0.73	)

	2012
	First			Second			Third			Fourth			Total
	(In thousands, except per share data)
	(As Restated)			(As Restated)			(As Restated)
Total oil and gas sales	$	111,689		$	100,736		$	112,895		$	106,603		$	431,923

Income (loss) from operations	$	2,841		$	(8,046	)	$	(24,419	)	$	(102,036	)	$	(131,660	)

Net income (loss)	$	1,375		$	7,165		$	(30,449	)	$	(78,151	)	$	(100,060	)

Net income (loss) per share:
Basic	$	0.03		$	0.15		$	(0.66	)	$	(1.68	)	$	(2.16	)
Diluted	$	0.03		$	0.15		$	(0.66	)	$	(1.68	)	$	(2.16	)

Basic and diluted per share amounts are the same for each of the quarters ended December 31, 2011, September 30, 2012, December 31, 2012 and for the years ended December 31, 2011 and December 31, 2012 due to the net loss reported during each of these periods.

Results of operations include the following non-routine items of income (expense), which are presented before the effect of income taxes:


	2011
	First			Second			Third			Fourth			Total
	(In thousands, except per share data)
Gain on sales of marketable securities	$	21,249		$	8,480		$	2,484		$	2,905		$	35,118

Impairments of unproved oil and gas properties	$	(9,454	)	$	—		$	(364	)	$	—		$	(9,818	)

Impairments of proved oil and gas properties	$	—		$	—		$	—		$	(60,817	)	$	(60,817	)

	2012
	First			Second			Third			Fourth			Total
	(In thousands, except per share data)
Gain on sale of oil and gas properties	$	6,727		$	20,338		$	(2,794	)	$	—		$	24,271

Gain on sales of marketable securities	$	26,621		$	—		$	—		$	—		$	26,621

Impairments of unproved oil and gas properties	$	(1,315	)	$	—		$	(1,370	)	$	(58,615	)	$	(61,300	)

Impairments of proved oil and gas properties	$	(49	)	$	(5,301	)	$	—		$	(20,018	)	$	(25,368	)

The Company is restating its financial statements for each of the fiscal quarters ended March 31, 2012, June 30, 2012, and September 30, 2012 with respect to the accounting and disclosures for certain derivative financial transactions under Accounting Standards Codification Topic 815, Derivatives and Hedging (“ASC 815”). The Company determined that the formal documentation it had prepared to support its initial hedge designations for effectiveness in connection with the Company’s oil hedging program was not compliant with the technical documentation requirements to qualify for cash flow hedge accounting treatment in accordance with ASC 815, and as a result, the Company was not permitted to utilize hedge accounting treatment in the preparation of its financial statements. The restatements eliminate hedge accounting treatment which had been applied in 2012 and reflect other immaterial adjustments to oil and gas sales.

Under ASC 815, the fair value of hedge contracts is recognized in the Company’s consolidated balance sheet as an asset or liability, as the case may be, and the amounts received or paid under the hedge contracts are reflected in earnings during the period in which the underlying production occurs. If the hedge contracts qualify for cash flow hedge accounting treatment, the fair value of the hedge contract is recorded in “accumulated other comprehensive income”, and changes in the fair value do not affect net income in the period. If the hedge contract does not qualify for hedge accounting treatment, the change in the fair value of the hedge contract is reflected in earnings during the period as unrealized gain or loss from derivatives. Under the cash flow hedge accounting treatment used by the Company, the fair value of the hedge contracts were recognized in the consolidated balance sheet with the resulting unrealized gain or loss recorded initially in “accumulated other comprehensive income” and later reclassified through earnings when the hedged production impacted earnings. As a result of the determination that the designation documentation failed to meet the requirements necessary to utilize cash flow hedge accounting treatment, the unrealized gain or loss should have been recorded in the consolidated statements of operations as a component of earnings. The Company has also been recognizing realized gains and losses from its derivative financial instruments in oil and gas sales, and is reclassifying these amounts as a separate component of non-operating income and expense.

The following tables present the restated condensed consolidated statements of operations and statements of other comprehensive income (loss) for the three months ended March 31, 2012, June 30, 2012 and September 30, 2012 and the nine months ended September 30, 2012, the restated condensed consolidated balance sheets as of March 31, 2012, June 30, 2012 and September 30, 2012, the consolidated statement of stockholders’ equity for the nine months ended September 30, 2012 and the condensed consolidated statements of cash flows for the three months ended March 31, 2012, the six months ended June 30, 2012 and the nine months ended September 30, 2012:

CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited)


	Three Months Ended March 31, 2012									Three Months Ended June 30, 2012									Three Months Ended September 30, 2012									Nine Months Ended September 30, 2012
	As Reported			Adjustments			As Restated			As Reported			Adjustments			As Restated			As Reported			Adjustments			As Restated			As Reported			Adjustments			As Restated
	(In thousands, except per share amounts)

Oil and gas sales	$	110,335		$	1,354		$	111,689		$	104,690		$	(3,954	)	$	100,736		$	117,129		$	(4,234	)	$	112,895		$	332,154		$	(6,834	)	$	325,320
Gain on sale of oil and gas properties		6,727			—			6,727			20,338			—			20,338			(2,794	)		—			(2,794	)		24,271			—			24,271

Total Revenues		117,062			1,354			118,416			125,028			(3,954	)		121,074			114,335			(4,234	)		110,101			356,425			(6,834	)		349,591
Total operating expenses		115,575			—			115,575			129,120			—			129,120			134,520			—			134,520			379,215			—			379,215

Operating income (loss)		1,487			1,354			2,841			(4,092	)		(3,954	)		(8,046	)		(20,185	)		(4,234	)		(24,419	)		(22,790	)		(6,834	)		(29,624	)
Other income (expenses):
Gain on sale of marketable securities		26,621			—			26,621			—			—			—			—			—			—			26,621			—			26,621
Realized gain (loss) from derivatives		—			(1,354	)		(1,354	)		—			2,719			2,719			—			3,293			3,293			—			4,658			4,658
Unrealized gain (loss) from derivatives		—			(10,187	)		(10,187	)		—			34,797			34,797			—			(11,112	)		(11,112	)		—			13,498			13,498
Other income		(23	)		262			239			545			(262	)		283			153			—			153			675			—			675
Interest expense		(13,237	)		—			(13,237	)		(14,529	)		—			(14,529	)		(17,535	)		—			(17,535	)		(45,301	)		—			(45,301	)

Total other income (expenses)		13,361			(11,279	)		2,082			(13,984	)		37,254			23,270			(17,382	)		(7,819	)		(25,201	)		(18,005	)		18,156			151

Income (loss) before income taxes		14,848			(9,925	)		4,923			(18,076	)		33,300			15,224			(37,567	)		(12,053	)		(49,620	)		(40,795	)		11,322			(29,473	)
Benefit from (provision for) income taxes		(7,989	)		4,441			(3,548	)		7,772			(15,831	)		(8,059	)		11,579			7,592			19,171			11,362			(3,798	)		7,564

Net income (loss)	$	6,859		$	(5,484	)	$	1,375		$	(10,304	)	$	17,469		$	7,165		$	(25,988	)	$	(4,461	)	$	(30,449	)	$	(29,433	)	$	7,524		$	(21,909	)

Net income (loss) per share:
Basic	$	0.14		$	(0.11	)	$	0.03		$	(0.22	)	$	0.37		$	0.15		$	(0.56	)	$	(0.10	)	$	(0.66	)	$	(0.63	)	$	0.16		$	(0.47	)

Diluted	$	0.14		$	(0.11	)	$	0.03		$	(0.22	)	$	0.37		$	0.15		$	(0.56	)	$	(0.10	)	$	(0.66	)	$	(0.63	)	$	0.16		$	(0.47	)

Weighted average shares outstanding:
Basic		46,372			—			46,372			46,426			—			46,426			46,443			—			46,443			46,414			—			46,414

Diluted		46,372			—			46,372			46,426			—			46,426			46,443			—			46,443			46,414			—			46,414

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(Unaudited)


	Three Months Ended March 31, 2012									Three Months Ended June 30, 2012
	As Reported			Adjustments			As Restated			As Reported			Adjustments			As Restated
	(In thousands, except per share amounts)
Net loss	$	6,859		$	(5,484	)	$	1,375		$	(10,304	)	$	17,469		$	7,165
Reclassified to earnings, net of provision for (benefit from) income taxes of $—, $161, $161, and $—, $—, $—		—			(298	)		(298	)		—			—			—
Unrealized hedging gains, net of provision for (benefit from) income taxes of $3,578, ($3,578), $— and ($12,087), $12,087, $—		(6,645	)		6,645			—			22,448			(22,448	)		—
Net change in unrealized gains and losses on marketable securities, net of benefit from (provision for) income taxes of $6,793, $—, $6,793, and $682, $—, $682		(12,612	)		—			(12,612	)		(1,268	)		—			(1,268	)

Other comprehensive income (loss)		(19,257	)		6,347			(12,910	)		21,180			(22,448	)		(1,268	)

Comprehensive income (loss)	$	(12,398	)	$	863		$	(11,535	)	$	10,876		$	(4,979	)	$	5,897


	Three Months Ended September 30, 2012									Nine Months Ended September 30, 2012
	As Reported			Adjustments			As Restated			As Reported			Adjustments			As Restated
	(In thousands, except per share amounts)
Net loss	$	(25,988	)	$	(4,461	)	$	(30,449	)	$	(29,433	)	$	7,524		$	(21,909	)
Reclassified to earnings, net of provision for (benefit from) income taxes of $—,$—, $— and $—, $161, $161		—			—			—			—			(298	)		(298	)
Unrealized hedging gains, net of provision for (benefit from) income taxes of $3,889, ($3,889), $— and ($4,620), $4,620, $—		(7,223	)		7,223			—			8,580			(8,580	)		—
Net change in unrealized gains and losses on marketable securities, net of benefit from (provision for) income taxes of $46, $—, $46 and $7,520, $—,$7,520		(86	)		—			(86	)		(13,966	)		—			(13,966	)

Other comprehensive income (loss)		(7,309	)		7,223			(86	)		(5,386	)		(8,878	)		(14,264	)

Comprehensive income (loss)	$	(33,297	)	$	2,762		$	(30,535	)	$	(34,819	)	$	(1,354	)	$	(36,173	)

CONDENSED CONSOLIDATED BALANCE SHEETS

(Unaudited)


	Three Months Ended March 31, 2012							Six Months Ended June 30, 2012							Nine Months Ended September 30, 2012
	As Reported		Adjustments			As Restated		As Reported		Adjustments			As Restated		As Reported		Adjustments			As Restated
	(In thousands)
ASSETS
Cash and Cash Equivalents	$	3,750	$	—		$	3,750	$	3,505	$	—		$	3,505	$	2,569	$	—		$	2,569
Restricted Cash		9,549		—			9,549		—		—			—		—		—			—
Accounts Receivable		51,918		—			51,918		42,122		(1,235	)		40,887		51,907		(2,176	)		49,731
Marketable Securities		17,154		—			17,154		15,204		—			15,204		15,072		—			15,072
Assets Held for Sale		91,520		—			91,520		—		—			—		—		—			—
Derivative Financial Instruments		—		—			—		18,536		—			18,536		10,823		—			10,823
Other Current Assets		2,908		—			2,908		6,695		—			6,695		7,658		—			7,658

Total Current Assets		176,799		—			176,799		86,062		(1,235	)		84,827		88,029		(2,176	)		85,853
Net Property and Equipment		2,517,672		—			2,517,672		2,547,219		—			2,547,219		2,546,024		—			2,546,024
Derivative Financial Instruments		—		—			—		6,235		—			6,235		2,836		—			2,836
Other Assets		16,201		—			16,201		21,796		—			21,796		20,950		—			20,950

	$	2,710,672	$	—		$	2,710,672	$	2,661,312	$	(1,235	)	$	2,660,077	$	2,657,839	$	(2,176	)	$	2,655,663


LIABILITIES AND STOCKHOLDERS’ EQUITY

Current Liabilities	$	250,060	$	—		$	250,060	$	176,726		—		$	176,726		200,086	$	—		$	200,086
Long-term Debt		1,207,042		—			1,207,042		1,223,235		—			1,223,235		1,238,809		—			1,238,809
Deferred Income Taxes Payable		208,078		(863	)		207,215		203,530		2,881			206,411		190,784		(822	)		189,962
Reserve for Future Abandonment Costs		13,536		—			13,536		14,191		—			14,191		14,545		—			14,545
Derivative Financial Instruments		2,205		—			2,205		—		—			—		—		—			—
Other Non-Current Liabilities		2,394		—			2,394		2,337		—			2,337		2,301		—			2,301

Total Liabilities		1,683,315		(863	)		1,682,452		1,620,019		2,881			1,622,900		1,646,525		(822	)		1,645,703
Commitments and Contingencies
Stockholders’ Equity:
Common stock		24,058		—			24,058		24,081		—			24,081		24,081		—			24,081
Additional Paid-in Capital		470,844		—			470,844		473,881		—			473,881		477,199		—			477,199
Retained Earnings		531,236		(5,484	)		525,752		520,932		11,985			532,917		494,944		7,524			502,468
Accumulated Other Comprehensive Income		1,219		6,347			7,566		22,399		(16,101	)		6,298		15,090		(8,878	)		6,212

Total Stockholders’ Equity		1,027,357		863			1,028,220		1,041,293		(4,116	)		1,037,177		1,011,314		(1,354	)		1,009,960

	$	2,710,672	$	—		$	2,710,672	$	2,661,312	$	(1,235	)	$	2,660,077	$	2,657,839	$	(2,176	)	$	2,655,663

CONSOLIDATED STATEMENT OF STOCKHOLDERS’ EQUITY

(Unaudited)


	Common Shares		Common Stock-Par Value		Additional Paid-in Capital			Retained Earnings			Accumulated Other Comprehensive Income			Total
	(In thousands)
Balance at December 31, 2011		48,125	$	24,063	$	468,709		$	524,377		$	20,476		$	1,037,625
Stock-based compensation		37		18		10,171			—			—			10,189
Excess income taxes from stock-based compensation		—		—		(1,681	)		—			—			(1,681	)
Net loss – as restated		—		—		—			(21,909	)		—			(21,909	)
Other comprehensive loss – as restated		—		—		—			—			(14,264	)		(14,264	)

Balance at September 30, 2012 – as restated		48,162	$	24,081	$	477,199		$	502,468		$	6,212		$	1,009,960

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)


	Three Months Ended March 31, 2012									Six Months Ended June 30, 2012									Nine Months Ended September 30, 2012
	As Reported			Adjustments			As Restated			As Reported			Adjustments			As Restated			As Reported			Adjustments			As Restated
	(In thousands)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income ( loss)	$	6,859		$	(5,484	)	$	1,375		$	(3,445	)	$	11,985		$	8,540		$	(29,433	)	$	7,524		$	(21,909	)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Gain on sale of assets		(33,348	)		—			(33,348	)		(53,686	)		—			(53,686	)		(50,892	)		—			(50,892	)
Deferred income taxes		8,072			(4,441	)		3,631			416			11,390			11,806			(11,151	)		3,798			(7,353	)
Dry hole costs and leasehold impairments		1,315			—			1,315			1,315			—			1,315			2,685			—			2,685
Impairment of oil and gas properties		49			—			49			5,350			—			5,350			5,350			—			5,350
Depreciation, depletion and amortization		79,097			—			79,097			169,180			—			169,180			268,410			—			268,410
Unrealized gains from derivatives		262			9,925			10,187			—			(24,610	)		(24,610	)		—			(13,498	)		(13,498	)
Debt issuance cost and discount amortization		944			—			944			2,103			—			2,103			3,689			—			3,689
Stock-based compensation		3,535			—			3,535			6,860			—			6,860			10,189			—			10,189
Excess income taxes from stock-based compensation		1,405			—			1,405			1,670			—			1,670			1,681			—			1,681
Decrease in accounts receivable		1,815			—			1,815			11,611			1,235			12,846			1,826			2,176			4,002
Increase in other current assets		(199	)		—			(199	)		(4,097	)		—			(4,097	)		(5,059	)		—			(5,059	)
Increase in accounts payable and accrued expenses		63,374			—			63,374			4,621			—			4,621			28,403			—			28,403

Net cash provided by operating activities		133,180			—			133,180			141,898			—			141,898			225,698			—			225,698

CASH FLOWS FROM INVESTING ACTIVITIES:
Net cash used for investing activities		(146,423	)		—			(146,423	)		(164,560	)		—			(164,560	)		(264,119	)		—			(264,119	)

CASH FLOWS FROM FINANCING ACTIVITIES:
Net cash provided by financing activities		8,533			—			8,533			17,707			—			17,707			32,530			—			32,530

Net decrease in cash and cash equivalents		(4,710	)		—			(4,710	)		(4,955	)		—			(4,955	)		(5,891	)		—			(5,891	)
Cash and cash equivalents, beginning of the year		8,460			—			8,460			8,460			—			8,460			8,460			—			8,460

Cash and cash equivalents, end of the year	$	3,750		$	—		$	3,750		$	3,505		$	—		$	3,505		$	2,569		$	—		$	2,569

- Definition

The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished.

+ References + Details

Oil and Gas Reserves Information (Unaudited)

12 Months Ended

Dec. 31, 2012

Oil and Gas Reserves Information (Unaudited)

(12) Oil and Gas Reserves Information (Unaudited)

Set forth below is a summary of the changes in Comstock’s net quantities of oil and natural gas reserves for each of the three years ended December 31, 2012:


	2010						2011						2012
	Oil (MBbls)			Natural Gas (MMcf)			Oil (MBbls)			Natural Gas (MMcf)			Oil (MBbls)			Natural Gas (MMcf)
Proved Reserves:
Beginning of year		7,214			682,389			4,219			1,025,633			32,099			1,118,632
Revisions of previous estimates		351			(6,137	)		8			(36,150	)		(397	)		(531,335	)
Extensions and discoveries		1,484			421,657			9,845			169,188			17,312			31,050
Purchases of minerals in place		—			—			18,865			50,554			—			—
Disposals of minerals in place		(4,115	)		(3,303	)		—			—			(7,486	)		(59,257	)
Production		(715	)		(68,973	)		(838	)		(90,593	)		(2,309	)		(82,490	)

End of year		4,219			1,025,633			32,099			1,118,632			39,219			476,600

Proved Developed Reserves:
Beginning of year		4,894			367,102			2,961			506,809			8,405			550,474

End of year		2,961			506,809			8,405			550,474			12,308			368,775

During 2012, the Company’s estimated quantities of proved undeveloped natural gas reserves decreased by 460 Bcf from total proved undeveloped reserves as of December 31, 2011 due to downward revisions related to the lower natural gas price that was used to determine estimated reserve quantities at December 31, 2012. Substantially all of the Company’s proved undeveloped natural gas reserves related to undrilled natural gas wells at December 31, 2011 were not economic at the lower natural gas price at December 31, 2012. The decrease in proved undeveloped natural gas reserves in 2012 resulted in an increase to the Company’s per unit amortization rate for its proved oil and gas properties and, accordingly, increased depletion, depreciation and amortization expense during 2012 as compared to previous periods.

The proved oil and gas reserves utilized in the preparation of the financial statements were estimated by Lee Keeling and Associates, independent petroleum consultants, in accordance with guidelines established by the Securities and Exchange Commission and the Financial Accounting Standards Board, which require that reserve reports be prepared under existing economic and operating conditions with no provision for price and cost escalation except by contractual agreement. All of the Company’s reserves are located onshore in the continental United States of America.

The following table sets forth the standardized measure of discounted future net cash flows relating to proved reserves at December 31, 2011 and 2012:


	2011			2012
	(In thousands)
Cash Flows Relating to Proved Reserves:
Future Cash Flows	$	7,656,654		$	5,064,519
Future Costs:
Production		(2,259,147	)		(1,585,309	)
Development and Abandonment		(2,174,656	)		(1,165,991	)
Future Income Taxes		(843,266	)		(552,843	)

Future Net Cash Flows		2,379,585			1,760,376
10% Discount Factor		(1,266,090	)		(976,159	)

Standardized Measure of Discounted Future Net Cash Flows	$	1,113,495		$	784,217

The standardized measure of discounted future net cash flows at the end of 2011 and 2012 was determined based on the simple average of the first of month market prices for oil and natural gas for each year. Prices were $92.93 per barrel of oil and $4.18 per Mcf of natural gas for 2011 and $94.61 per barrel of oil and $2.84 per Mcf of natural gas for 2012. Prices used in determining quantities of oil and natural gas reserves and future cash inflows from oil and natural gas reserves represent prices received at the Company’s sales point. These prices have been adjusted from posted or index prices for both location and quality differences. Future development and production costs are computed by estimating the expenditures to be incurred in developing and producing proved oil and gas reserves at the end of the year, based on year end costs and assuming continuation of existing economic conditions. Future income tax expenses are computed by applying the appropriate statutory tax rates to the future pre-tax net cash flows relating to proved reserves, net of the tax basis of the properties involved. The future income tax expenses give effect to permanent differences and tax credits, but do not reflect the impact of future operations.

The following table sets forth the changes in the standardized measure of discounted future net cash flows relating to proved reserves for the years ended December 31, 2010, 2011 and 2012:


	2010			2011			2012
	(In thousands)
Standardized Measure, Beginning of Year	$	426,590		$	606,136		$	1,113,495
Net change in sales price, net of production costs		141,570			1,061			(428,469	)
Development costs incurred during the year which were previously estimated		69,216			205,418			211,020
Revisions of quantity estimates		(5,433	)		(50,398	)		(892,645	)
Accretion of discount		48,911			79,763			148,697
Changes in future development and abandonment costs		(15,201	)		10,151			653,824
Changes in timing and other		66,657			(58,049	)		(16,176	)
Extensions and discoveries		321,909			540,937			467,080
Purchases of minerals in place		—			316,118			—
Sales of minerals in place		(50,651	)		—			(261,971	)
Sales, net of production costs		(268,466	)		(355,654	)		(341,803	)
Net changes in income taxes		(128,966	)		(181,988	)		131,165

Standardized Measure, End of Year	$	606,136		$	1,113,495		$	784,217

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2012

Basis of Presentation and Principles of Consolidation

Basis of Presentation and Principles of Consolidation

Reclassifications

Reclassifications

Certain reclassifications have been made to prior periods’ financial statements to conform to the current presentation.

Use of Estimates in the Preparation of Financial Statements

Use of Estimates in the Preparation of Financial Statements

Concentration of Credit Risk and Accounts Receivable

Concentration of Credit Risk and Accounts Receivable

Marketable Securities

Marketable Securities

Other Current Assets

Other Current Assets

Other current assets at December 31, 2011 and 2012 consist of the following:


	As of December 31,
	2011		2012
	(In thousands)
Pipe and oil field equipment inventory	$	2,314	$	1,922
Production tax refunds receivable		—		1,830
Derivative settlements receivable		—		1,693
Drilling advances		—		1,160
Prepaid expenses		397		300
Other		85		49

	$	2,796	$	6,954

Fair Value Measurements

Fair Value Measurements

Level 1 – Inputs used to measure fair value are unadjusted quoted prices that are available in active markets for the identical assets or liabilities as of the reporting date.

The following table summarizes financial assets accounted for at fair value as of December 31, 2012:


	Carrying Value Measured at Fair Value at December 31, 2012		Level 1		Level 2
	(In thousands)
Assets measured at fair value on a recurring basis:
Cash held in bank accounts	$	4,471	$	4,471	$	—
Marketable securities		12,312		12,312		—
Derivative financial instruments		11,651		—		11,651

Total assets	$	28,434	$	16,783	$	11,651

The following table summarizes the changes in the fair values of derivative financial instruments, which are Level 2 liabilities, for the years ended December 31, 2010, 2011 and 2012:


	2010		2011		2012
	(In thousands)
Balance beginning of period	$	—	$	—	$	459
Purchases and settlements (net)		—		—		(9,766)
Total realized or unrealized gains:
Realized gains included in earnings		—		—		9,766
Unrealized gains included in earnings		—		—		11,651
Unrealized gains included in other comprehensive income		—		459		(459)

Balance end of period	$	—	$	459	$	11,651

The following table presents the carrying amounts and estimated fair value of the Company’s other financial instruments as of December 31, 2011 and 2012:


	2011				2012
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(In thousands)
Long-term debt, including current portion	$	1,196,908	$	1,167,000	$	1,324,383	$	1,382,000

Property and Equipment

Property and Equipment

Accrued Expenses

Accrued Expenses

Accrued expenses at December 31, 2011 and 2012 consist of the following:


	As of December 31,
	2011		2012
	(In thousands)
Accrued drilling costs	$	29,291	$	14,050
Accrued interest payable		11,113		12,351
Advance from joint venture partner		—		7,286
Accrued oil and gas property acquisition costs		31,988		2,413
Other		13,110		11,272

	$	85,502	$	47,372

Reserve for Future Abandonment Costs

Reserve for Future Abandonment Costs

The following table summarizes the changes in the Company’s total estimated liability:


	2010		2011		2012
	(In thousands)
Reserve for Future Abandonment Costs at beginning of the year	$	6,561	$	6,674	$	13,997
New wells placed on production		338		417		1,837
Changes in estimates		596		5,839		2,736
Acquisition liabilities assumed		—		741		—
Liabilities settled and assets disposed of		(1,212)		(56)		(1,304)
Accretion expense		391		382		728

Reserve for Future Abandonment Costs at end of the year	$	6,674	$	13,997	$	17,994

Other Assets

Other Assets

Stock-based Compensation

Stock-based Compensation

Segment Reporting

Segment Reporting

The Company presently operates in one business segment, the exploration and production of oil and natural gas.

Derivative Instruments and Hedging Activities

Derivative Instruments and Hedging Activities

Major Purchasers

Major Purchasers

Revenue Recognition and Gas Balancing

Revenue Recognition and Gas Balancing

General and Administrative Expenses

General and Administrative Expenses

Income Taxes

Income Taxes

Earnings Per Share

Earnings Per Share

Basic and diluted earnings per share for 2010, 2011 and 2012 were determined as follows:


	2010								2011								2012
	Loss			Shares		Per Share			Loss			Shares		Per Share			Loss			Shares		Per Share
	(In thousands except per share data)
Net Loss	$	(19,586	)						$	(33,472	)						$	(100,060	)
Income Allocable to Unvested Stock Grants		—								—								—

Basic Net Loss Attributable to Common Stock	$	(19,586	)		45,561	$	(0.43	)	$	(33,472	)		45,997	$	(0.73	)	$	(100,060	)		46,422	$	(2.16	)

Effect of Dilutive Securities:
Stock Options		—			—					—			—					—			—
Performance Stock Units		—			—					—			—					—			—

Diluted Net Loss Attributable to Common Stock	$	(19,586	)		45,561	$	(0.43	)	$	(33,472	)		45,997	$	(0.73	)	$	(100,060	)		46,422	$	(2.16	)

2010

2011

2012

(In thousands)

Unvested restricted stock

1,715

1,683

1,737

All stock options, unvested stock and PSUs were anti-dilutive to earnings and excluded from weighted average shares used in the computation of earnings per share due to the net loss in each period.

Options to purchase common stock that were outstanding and that were excluded as anti-dilutive from determination of diluted earnings per share were as follows:


	2010		2011		2012
	(In thousands except per share data)
Weighted average anti-dilutive stock options		240		215		168
Weighted average exercise price	$	35.98	$	36.42	$	37.81

Supplementary Information With Respect to the Consolidated Statements of Cash Flows

Supplementary Information With Respect to the Consolidated Statements of Cash Flows

For the purpose of the consolidated statements of cash flows, the Company considers all highly liquid investments purchased with an original maturity of three months or less to be cash equivalents.

Cash payments made for interest and income taxes for the years ended December 31, 2010, 2011 and 2012, respectively, were as follows:


	2010			2011			2012
	(In thousands)
Cash Payments:
Interest payments	$	40,467		$	49,109		$	79,001
Income tax refunds	$	(48,575	)	$	(1,403	)	$	(58	)

Comprehensive Loss

Comprehensive Loss

Comprehensive loss consists of the following:


	For the Year Ended December 31,
	2010			2011			2012
	(In thousands)
Net Loss	$	(19,586	)	$	(33,472	)	$	(100,060	)
Other comprehensive income (loss):
Realized gains on marketable securities reclassified to earnings, net of provision for income taxes of ($5,785) in 2010, ($12,291) in 2011 and ($9,318) in 2012		(10,744	)		(22,827	)		(17,303	)
Unrealized hedging gains, net of provision for (benefit from) income taxes of $161 in 2011 and ($161) in 2012		—			298			(298	)
Unrealized gains on marketable securities, net of provision for income taxes of $6,707 in 2010, $5,748 in 2011 and $831 in 2012		12,455			10,675			1,543

Total comprehensive loss	$	(17,875	)	$	(45,326	)	$	(116,118	)

The following table provides a summary of the amounts included in accumulated other comprehensive income, net of income taxes, for the years ended December 31, 2010, 2011 and 2012:


	Oil Price Swap Agreements			Marketable Securities			Total Accumulated Comprehensive Income
	(In thousands)
Balance as of December 31, 2009	$	—		$	30,619		$	30,619
Reclassification to earnings		—			(10,744	)		(10,744	)
Changes in value		—			12,455			12,455

Balance as of December 31, 2010		—			32,330			32,330
Reclassification to earnings		—			(22,827	)		(22,827	)
Changes in value		298			10,675			10,973

Balance as of December 31, 2011		298			20,178			20,476
Reclassification to earnings		(298	)		(17,303	)		(17,601	)
Changes in value		—			1,543			1,543

Balance as of December 31, 2012	$	—		$	4,418		$	4,418

Subsequent Events

Subsequent Events

Subsequent events were evaluated through the issuance date of these consolidated financial statements.

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Other Current Assets

Other current assets at December 31, 2011 and 2012 consist of the following:


	As of December 31,
	2011		2012
	(In thousands)
Pipe and oil field equipment inventory	$	2,314	$	1,922
Production tax refunds receivable		—		1,830
Derivative settlements receivable		—		1,693
Drilling advances		—		1,160
Prepaid expenses		397		300
Other		85		49

	$	2,796	$	6,954

Summary of Financial Assets at Fair Value

The following table summarizes financial assets accounted for at fair value as of December 31, 2012:


	Carrying Value Measured at Fair Value at December 31, 2012		Level 1		Level 2
	(In thousands)
Assets measured at fair value on a recurring basis:
Cash held in bank accounts	$	4,471	$	4,471	$	—
Marketable securities		12,312		12,312		—
Derivative financial instruments		11,651		—		11,651

Total assets	$	28,434	$	16,783	$	11,651

Summary of Changes in Fair Value Level 2 Assets of Derivative Financial Instruments

The following table summarizes the changes in the fair values of derivative financial instruments, which are Level 2 liabilities, for the years ended December 31, 2010, 2011 and 2012:


	2010		2011		2012
	(In thousands)
Balance beginning of period	$	—	$	—	$	459
Purchases and settlements (net)		—		—		(9,766)
Total realized or unrealized gains:
Realized gains included in earnings		—		—		9,766
Unrealized gains included in earnings		—		—		11,651
Unrealized gains included in other comprehensive income		—		459		(459)

Balance end of period	$	—	$	459	$	11,651

Carrying Amounts and Estimated Fair Value of Other Financial Instruments

The following table presents the carrying amounts and estimated fair value of the Company’s other financial instruments as of December 31, 2011 and 2012:


	2011				2012
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(In thousands)
Long-term debt, including current portion	$	1,196,908	$	1,167,000	$	1,324,383	$	1,382,000

Summary of Accrued Expenses

Accrued expenses at December 31, 2011 and 2012 consist of the following:


	As of December 31,
	2011		2012
	(In thousands)
Accrued drilling costs	$	29,291	$	14,050
Accrued interest payable		11,113		12,351
Advance from joint venture partner		—		7,286
Accrued oil and gas property acquisition costs		31,988		2,413
Other		13,110		11,272

	$	85,502	$	47,372

Summary of Changes in Reserve for Future Abandonment Costs

The following table summarizes the changes in the Company’s total estimated liability:


	2010		2011		2012
	(In thousands)
Reserve for Future Abandonment Costs at beginning of the year	$	6,561	$	6,674	$	13,997
New wells placed on production		338		417		1,837
Changes in estimates		596		5,839		2,736
Acquisition liabilities assumed		—		741		—
Liabilities settled and assets disposed of		(1,212)		(56)		(1,304)
Accretion expense		391		382		728

Reserve for Future Abandonment Costs at end of the year	$	6,674	$	13,997	$	17,994

Basic and Diluted Earnings Per Share

Basic and diluted earnings per share for 2010, 2011 and 2012 were determined as follows:


	2010								2011								2012
	Loss			Shares		Per Share			Loss			Shares		Per Share			Loss			Shares		Per Share
	(In thousands except per share data)
Net Loss	$	(19,586	)						$	(33,472	)						$	(100,060	)
Income Allocable to Unvested Stock Grants		—								—								—

Basic Net Loss Attributable to Common Stock	$	(19,586	)		45,561	$	(0.43	)	$	(33,472	)		45,997	$	(0.73	)	$	(100,060	)		46,422	$	(2.16	)

Effect of Dilutive Securities:
Stock Options		—			—					—			—					—			—
Performance Stock Units		—			—					—			—					—			—

Diluted Net Loss Attributable to Common Stock	$	(19,586	)		45,561	$	(0.43	)	$	(33,472	)		45,997	$	(0.73	)	$	(100,060	)		46,422	$	(2.16	)

Weighted Average Shares of Unvested Restricted Stock

dividends that might be declared and have the right to vote. Weighted average shares of unvested restricted stock included in common stock outstanding were as follows:

2010

2011

2012

(In thousands)

Unvested restricted stock

1,715

1,683

1,737

Common Stock Stock Options Excluded as Anti-Dilutive from Determination of Diluted Earnings Per Share

Options to purchase common stock that were outstanding and that were excluded as anti-dilutive from determination of diluted earnings per share were as follows:


	2010		2011		2012
	(In thousands except per share data)
Weighted average anti-dilutive stock options		240		215		168
Weighted average exercise price	$	35.98	$	36.42	$	37.81

Cash Payments Made for Interest and Income Taxes

Cash payments made for interest and income taxes for the years ended December 31, 2010, 2011 and 2012, respectively, were as follows:


	2010			2011			2012
	(In thousands)
Cash Payments:
Interest payments	$	40,467		$	49,109		$	79,001
Income tax refunds	$	(48,575	)	$	(1,403	)	$	(58	)

Comprehensive Loss

Comprehensive loss consists of the following:


	For the Year Ended December 31,
	2010			2011			2012
	(In thousands)
Net Loss	$	(19,586	)	$	(33,472	)	$	(100,060	)
Other comprehensive income (loss):
Realized gains on marketable securities reclassified to earnings, net of provision for income taxes of ($5,785) in 2010, ($12,291) in 2011 and ($9,318) in 2012		(10,744	)		(22,827	)		(17,303	)
Unrealized hedging gains, net of provision for (benefit from) income taxes of $161 in 2011 and ($161) in 2012		—			298			(298	)
Unrealized gains on marketable securities, net of provision for income taxes of $6,707 in 2010, $5,748 in 2011 and $831 in 2012		12,455			10,675			1,543

Total comprehensive loss	$	(17,875	)	$	(45,326	)	$	(116,118	)

Accumulated Other Comprehensive Income, Net of Income Taxes

The following table provides a summary of the amounts included in accumulated other comprehensive income, net of income taxes, for the years ended December 31, 2010, 2011 and 2012:


	Oil Price Swap Agreements			Marketable Securities			Total Accumulated Comprehensive Income
	(In thousands)
Balance as of December 31, 2009	$	—		$	30,619		$	30,619
Reclassification to earnings		—			(10,744	)		(10,744	)
Changes in value		—			12,455			12,455

Balance as of December 31, 2010		—			32,330			32,330
Reclassification to earnings		—			(22,827	)		(22,827	)
Changes in value		298			10,675			10,973

Balance as of December 31, 2011		298			20,178			20,476
Reclassification to earnings		(298	)		(17,303	)		(17,601	)
Changes in value		—			1,543			1,543

Balance as of December 31, 2012	$	—		$	4,418		$	4,418

Acquisitions and Dispositions of Oil and Gas Properties (Tables)

12 Months Ended

Dec. 31, 2012

Purchase Price Allocation including Final Post-Closing Adjustments

The purchase price allocation, including final post-closing adjustments finalized during 2012, was as follows:


	(In thousands)
Consideration paid:
Cash	$	337,896

Total consideration paid	$	337,896

Amounts Recognized for Fair Value of Assets Acquired and Liabilities Assumed

Amounts recognized for the fair value of assets acquired and liabilities assumed were as follows:


	(In thousands)
Proved properties	$	205,758
Unproved properties		143,751
Asset retirement obligation		(741	)
Liabilities assumed		(10,872	)

Net fair value of properties acquired and liabilities assumed	$	337,896

Oil and Gas Producing Activities (Tables)

12 Months Ended

Dec. 31, 2012

Capitalized Costs Related to Oil and Gas Property Acquisition Exploration and Development Activities

Capitalized Costs


	As of December 31,
	2011			2012
	(In thousands)
Unproved properties	$	369,096		$	263,652
Proved properties:
Leasehold costs		1,162,094			1,125,460
Wells and related equipment and facilities		2,314,052			2,654,256
Accumulated depreciation depletion and amortization		(1,349,871	)		(1,588,046	)

	$	2,495,371		$	2,455,322

Costs Incurred Related to Oil and Gas Property Acquisition Exploration and Development Activities

Costs Incurred


	For the Years Ended December 31,
	2010		2011		2012
	(In thousands)
Property Acquisitions:
Unproved property acquisitions	$	134,728	$	255,699	$	29,677
Proved property acquisitions		—		219,402		3,235
Development costs		315,041		496,506		514,629
Exploration costs		87,823		83,182		5,522

	$	537,592	$	1,054,789	$	553,063

- Definition

Tabular disclosure of the aggregate of costs (whether the costs are capitalized or charged to expense at the time they are incurred ) incurred for the year in oil and gas property acquisition, exploration and development activities.

+ References + Details

Long-term Debt (Tables)

12 Months Ended

Dec. 31, 2012

Long-term Debt

Long-term debt is comprised of the following:


	As of December 31,
	2011			2012
	(In thousands)
Bank credit facility	$	600,000		$	440,000
8³/₈% senior notes due 2017		300,000			300,000
Discount related to 8³/₈% senior notes due 2017		(3,092	)		(2,556	)
7³/₄% senior notes due 2019		300,000			300,000
9¹/₂% senior notes due 2020		—			300,000
Discount related to 9¹/₂% senior notes due 2020		—			(13,061	)

	$	1,196,908		$	1,324,383

Debt by Year of Maturity

The following table summarizes Comstock’s debt as of December 31, 2012 by year of maturity:


	2013		2014		2015		2016		2017		Thereafter		Total
	(In thousands)
Bank credit facility	$	—	$	—	$	440,000	$	—	$	—	$	—	$	440,000
8³/₈% senior notes		—		—		—		—		297,444		—		297,444
7³/₄% senior notes		—		—		—		—		—		300,000		300,000
9¹/₂% senior notes		—		—		—		—		—		286,939		286,939

	$	—	$	—	$	440,000	$	—	$	297,444	$	586,939	$	1,324,383

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

+ Details

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2012

Minimum Future Payments under Leases


	(In thousands)
2013	$	1,983
2014		2,012
2015		2,038
2016		1,994
2017		2,021
Thereafter		6,740

	$	16,788

Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2012

Stock Options Outstanding

The Company has not issued any stock options since 2008. The following table summarizes information related to stock options outstanding at December 31, 2012:


Exercise Price	Weighted Average Remaining Life (in years)		Number of Options Outstanding		Number of Options Exercisable
$32.50		2.9		51,500		51,500
$33.22		4.0		65,650		65,650
$54.36		0.4		40,000		40,000

				157,150		157,150

Stock Option Activity under Company's Incentive Plans

The following table summarizes information related to stock option activity under the Company’s incentive plans for the year ended December 31, 2012:


	Number of Options			Weighted Average Exercise Price
Outstanding at January 1, 2012		203,150		$	36.64
Expired and forfeited		(46,000	)	$	30.74

Outstanding at December 31, 2012		157,150		$	38.36

Vested and Exercisable at December 31, 2012		157,150		$	38.36

Options Exercised and Tax Benefit Realized


	2010		2011		2012
	(In thousands)
Cash received for options exercised	$	1,427	$	—	$	—
Actual tax benefit realized	$	4,221	$	—	$	—

Summary of Restricted Stock Activity

A summary of restricted stock activity for the year ended December 31, 2012 is presented below:


	Number of Restricted Shares			Weighted Average Grant Price
Outstanding at January 1, 2012		2,114,520		$	31.25
Granted		303,530		$	15.49
Vested		(437,123	)	$	35.07
Forfeitures		(20,092	)	$	26.10

Outstanding at December 31, 2012		1,960,835		$	28.01

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Income Tax Benefit

The following is an analysis of the consolidated income tax benefit:


	2010			2011			2012
	(In thousands)
Current	$	(229	)	$	28		$	(162	)
Deferred		(4,617	)		(14,652	)		(47,192	)

	$	(4,846	)	$	(14,624	)	$	(47,354	)

Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation

The difference between the Company’s customary rate of 35% and the effective tax rate on income before income taxes is due to the following:


	2010			2011			2012
	(In thousands)
Tax benefit at statutory rate	$	(8,551	)	$	(16,834	)	$	(51,595	)
Tax effect of:
Nondeductible compensation		4,253			2,753			2,545
State taxes, net of federal tax benefit		(343	)		(741	)		1,486
Net operating loss carryback adjustments		(369	)		—			—
Other		164			198			210

Total	$	(4,846	)	$	(14,624	)	$	(47,354	)

Difference Between Customary Rate and Effective Tax Rate on Income Before Income Taxes Due

The difference between the Company’s customary rate of 35% and the effective tax rate on income before income taxes is due to the following:


	2010			2011			2012
Statutory rate		35.0	%		35.0	%		35.0	%
Tax effect of:
Nondeductible compensation		(17.4	)		(5.7	)		(1.7	)
State taxes, net of federal tax benefit		1.4			1.5			(1.0	)
Net operating loss carryback adjustments		1.5			—			—
Other		(0.7	)		(0.4	)		(0.2	)

Effective tax rate		19.8	%		30.4	%		32.1	%

Tax Effects of Significant Temporary Differences Representing Net Deferred Tax Asset and Liability

The tax effects of significant temporary differences representing the net deferred tax asset and liability at December 31, 2011 and 2012 were as follows:


	2011			2012
	(In thousands)
Current deferred tax liabilities:
Marketable securities	$	(7,503	)	$	(1,262	)
Derivative financial instruments		(161	)		(4,078	)

Net current deferred tax liability		(7,664	)		(5,340	)

Noncurrent deferred tax liabilities:
Property and equipment		(253,580	)		(247,062	)
Other assets		8,772			8,319
Net operating loss carryforwards		47,320			95,180
Alternative minimum tax carryforward		19,093			19,080
Valuation allowance on net operating loss carryforwards		(19,630	)		(23,009	)
Other		(3,680	)		(2,409	)

Net noncurrent deferred tax liability		(201,705	)		(149,901	)

Net deferred tax liability	$	(209,369	)	$	(155,241	)

Carryforwards Available to Reduce Future Income Taxes

At December 31, 2012, Comstock had the following carryforwards available to reduce future income taxes:


Types of Carryforward	Years of Expiration Carryforward	Amount
		(In thousands)
Net operating loss — U.S. federal	2017 — 2032	$	192,255
Net operating loss — Louisiana	2012 — 2027	$	536,365
Alternative minimum tax credits	Unlimited	$	19,080

- Definition

Tabular disclosure of tax credit carryforwards available to reduce future taxable income, including amounts, expiration dates, limitations on use and the related deferred tax assets and valuation allowances.

+ References + Details

Derivative Financial Instruments and Hedging Activities (Tables)

12 Months Ended

Dec. 31, 2012

Summary of Outstanding Commodity Derivatives

As of December 31, 2012, the Company had the following outstanding commodity derivatives:

Commodity and Derivative Type

Weighted-
Average
Contract Price

Volume
(Barrels)

Contract Period

Oil Price Swap Agreements

98.67 per Bbl.

2,160,000

Jan. 2013 – Dec. 2013

Supplementary Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Supplementary Quarterly Financial Data (Unaudited)


	2011
	First			Second			Third			Fourth			Total
	(In thousands, except per share data)
Total oil and gas sales	$	88,038		$	112,451		$	119,422		$	114,456		$	434,367

Income (loss) from operations	$	(8,263	)	$	8,378		$	12,086		$	(53,517	)	$	(41,316	)

Net income (loss)	$	2,404		$	3,949		$	1,309		$	(41,134	)	$	(33,472	)

Net income (loss) per share:
Basic	$	0.05		$	0.08		$	0.03		$	(0.89	)	$	(0.73	)
Diluted	$	0.05		$	0.08		$	0.03		$	(0.89	)	$	(0.73	)

	2012
	First			Second			Third			Fourth			Total
	(In thousands, except per share data)
	(As Restated)			(As Restated)			(As Restated)
Total oil and gas sales	$	111,689		$	100,736		$	112,895		$	106,603		$	431,923

Income (loss) from operations	$	2,841		$	(8,046	)	$	(24,419	)	$	(102,036	)	$	(131,660	)

Net income (loss)	$	1,375		$	7,165		$	(30,449	)	$	(78,151	)	$	(100,060	)

Net income (loss) per share:
Basic	$	0.03		$	0.15		$	(0.66	)	$	(1.68	)	$	(2.16	)
Diluted	$	0.03		$	0.15		$	(0.66	)	$	(1.68	)	$	(2.16	)

Summary of Results of Operations from Non-Routine Items

Results of operations include the following non-routine items of income (expense), which are presented before the effect of income taxes:


	2011
	First			Second			Third			Fourth			Total
	(In thousands, except per share data)
Gain on sales of marketable securities	$	21,249		$	8,480		$	2,484		$	2,905		$	35,118

Impairments of unproved oil and gas properties	$	(9,454	)	$	—		$	(364	)	$	—		$	(9,818	)

Impairments of proved oil and gas properties	$	—		$	—		$	—		$	(60,817	)	$	(60,817	)

	2012
	First			Second			Third			Fourth			Total
	(In thousands, except per share data)
Gain on sale of oil and gas properties	$	6,727		$	20,338		$	(2,794	)	$	—		$	24,271

Gain on sales of marketable securities	$	26,621		$	—		$	—		$	—		$	26,621

Impairments of unproved oil and gas properties	$	(1,315	)	$	—		$	(1,370	)	$	(58,615	)	$	(61,300	)

Impairments of proved oil and gas properties	$	(49	)	$	(5,301	)	$	—		$	(20,018	)	$	(25,368	)

Condensed Consolidated Balance Sheets

CONDENSED CONSOLIDATED BALANCE SHEETS

(Unaudited)


	Three Months Ended March 31, 2012							Six Months Ended June 30, 2012							Nine Months Ended September 30, 2012
	As Reported		Adjustments			As Restated		As Reported		Adjustments			As Restated		As Reported		Adjustments			As Restated
	(In thousands)
ASSETS
Cash and Cash Equivalents	$	3,750	$	—		$	3,750	$	3,505	$	—		$	3,505	$	2,569	$	—		$	2,569
Restricted Cash		9,549		—			9,549		—		—			—		—		—			—
Accounts Receivable		51,918		—			51,918		42,122		(1,235	)		40,887		51,907		(2,176	)		49,731
Marketable Securities		17,154		—			17,154		15,204		—			15,204		15,072		—			15,072
Assets Held for Sale		91,520		—			91,520		—		—			—		—		—			—
Derivative Financial Instruments		—		—			—		18,536		—			18,536		10,823		—			10,823
Other Current Assets		2,908		—			2,908		6,695		—			6,695		7,658		—			7,658

Total Current Assets		176,799		—			176,799		86,062		(1,235	)		84,827		88,029		(2,176	)		85,853
Net Property and Equipment		2,517,672		—			2,517,672		2,547,219		—			2,547,219		2,546,024		—			2,546,024
Derivative Financial Instruments		—		—			—		6,235		—			6,235		2,836		—			2,836
Other Assets		16,201		—			16,201		21,796		—			21,796		20,950		—			20,950

	$	2,710,672	$	—		$	2,710,672	$	2,661,312	$	(1,235	)	$	2,660,077	$	2,657,839	$	(2,176	)	$	2,655,663


LIABILITIES AND STOCKHOLDERS’ EQUITY

Current Liabilities	$	250,060	$	—		$	250,060	$	176,726		—		$	176,726		200,086	$	—		$	200,086
Long-term Debt		1,207,042		—			1,207,042		1,223,235		—			1,223,235		1,238,809		—			1,238,809
Deferred Income Taxes Payable		208,078		(863	)		207,215		203,530		2,881			206,411		190,784		(822	)		189,962
Reserve for Future Abandonment Costs		13,536		—			13,536		14,191		—			14,191		14,545		—			14,545
Derivative Financial Instruments		2,205		—			2,205		—		—			—		—		—			—
Other Non-Current Liabilities		2,394		—			2,394		2,337		—			2,337		2,301		—			2,301

Total Liabilities		1,683,315		(863	)		1,682,452		1,620,019		2,881			1,622,900		1,646,525		(822	)		1,645,703
Commitments and Contingencies
Stockholders’ Equity:
Common stock		24,058		—			24,058		24,081		—			24,081		24,081		—			24,081
Additional Paid-in Capital		470,844		—			470,844		473,881		—			473,881		477,199		—			477,199
Retained Earnings		531,236		(5,484	)		525,752		520,932		11,985			532,917		494,944		7,524			502,468
Accumulated Other Comprehensive Income		1,219		6,347			7,566		22,399		(16,101	)		6,298		15,090		(8,878	)		6,212

Total Stockholders’ Equity		1,027,357		863			1,028,220		1,041,293		(4,116	)		1,037,177		1,011,314		(1,354	)		1,009,960

	$	2,710,672	$	—		$	2,710,672	$	2,661,312	$	(1,235	)	$	2,660,077	$	2,657,839	$	(2,176	)	$	2,655,663

Consolidated Statements Of Operations

CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited)


	Three Months Ended March 31, 2012									Three Months Ended June 30, 2012									Three Months Ended September 30, 2012									Nine Months Ended September 30, 2012
	As Reported			Adjustments			As Restated			As Reported			Adjustments			As Restated			As Reported			Adjustments			As Restated			As Reported			Adjustments			As Restated
	(In thousands, except per share amounts)

Oil and gas sales	$	110,335		$	1,354		$	111,689		$	104,690		$	(3,954	)	$	100,736		$	117,129		$	(4,234	)	$	112,895		$	332,154		$	(6,834	)	$	325,320
Gain on sale of oil and gas properties		6,727			—			6,727			20,338			—			20,338			(2,794	)		—			(2,794	)		24,271			—			24,271

Total Revenues		117,062			1,354			118,416			125,028			(3,954	)		121,074			114,335			(4,234	)		110,101			356,425			(6,834	)		349,591
Total operating expenses		115,575			—			115,575			129,120			—			129,120			134,520			—			134,520			379,215			—			379,215

Operating income (loss)		1,487			1,354			2,841			(4,092	)		(3,954	)		(8,046	)		(20,185	)		(4,234	)		(24,419	)		(22,790	)		(6,834	)		(29,624	)
Other income (expenses):
Gain on sale of marketable securities		26,621			—			26,621			—			—			—			—			—			—			26,621			—			26,621
Realized gain (loss) from derivatives		—			(1,354	)		(1,354	)		—			2,719			2,719			—			3,293			3,293			—			4,658			4,658
Unrealized gain (loss) from derivatives		—			(10,187	)		(10,187	)		—			34,797			34,797			—			(11,112	)		(11,112	)		—			13,498			13,498
Other income		(23	)		262			239			545			(262	)		283			153			—			153			675			—			675
Interest expense		(13,237	)		—			(13,237	)		(14,529	)		—			(14,529	)		(17,535	)		—			(17,535	)		(45,301	)		—			(45,301	)

Total other income (expenses)		13,361			(11,279	)		2,082			(13,984	)		37,254			23,270			(17,382	)		(7,819	)		(25,201	)		(18,005	)		18,156			151

Income (loss) before income taxes		14,848			(9,925	)		4,923			(18,076	)		33,300			15,224			(37,567	)		(12,053	)		(49,620	)		(40,795	)		11,322			(29,473	)
Benefit from (provision for) income taxes		(7,989	)		4,441			(3,548	)		7,772			(15,831	)		(8,059	)		11,579			7,592			19,171			11,362			(3,798	)		7,564

Net income (loss)	$	6,859		$	(5,484	)	$	1,375		$	(10,304	)	$	17,469		$	7,165		$	(25,988	)	$	(4,461	)	$	(30,449	)	$	(29,433	)	$	7,524		$	(21,909	)

Net income (loss) per share:
Basic	$	0.14		$	(0.11	)	$	0.03		$	(0.22	)	$	0.37		$	0.15		$	(0.56	)	$	(0.10	)	$	(0.66	)	$	(0.63	)	$	0.16		$	(0.47	)

Diluted	$	0.14		$	(0.11	)	$	0.03		$	(0.22	)	$	0.37		$	0.15		$	(0.56	)	$	(0.10	)	$	(0.66	)	$	(0.63	)	$	0.16		$	(0.47	)

Weighted average shares outstanding:
Basic		46,372			—			46,372			46,426			—			46,426			46,443			—			46,443			46,414			—			46,414

Diluted		46,372			—			46,372			46,426			—			46,426			46,443			—			46,443			46,414			—			46,414

Consolidated Statements Of Comprehensive Income (Loss)

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(Unaudited)


	Three Months Ended March 31, 2012									Three Months Ended June 30, 2012
	As Reported			Adjustments			As Restated			As Reported			Adjustments			As Restated
	(In thousands, except per share amounts)
Net loss	$	6,859		$	(5,484	)	$	1,375		$	(10,304	)	$	17,469		$	7,165
Reclassified to earnings, net of provision for (benefit from) income taxes of $—, $161, $161, and $—, $—, $—		—			(298	)		(298	)		—			—			—
Unrealized hedging gains, net of provision for (benefit from) income taxes of $3,578, ($3,578), $— and ($12,087), $12,087, $—		(6,645	)		6,645			—			22,448			(22,448	)		—
Net change in unrealized gains and losses on marketable securities, net of benefit from (provision for) income taxes of $6,793, $—, $6,793, and $682, $—, $682		(12,612	)		—			(12,612	)		(1,268	)		—			(1,268	)

Other comprehensive income (loss)		(19,257	)		6,347			(12,910	)		21,180			(22,448	)		(1,268	)

Comprehensive income (loss)	$	(12,398	)	$	863		$	(11,535	)	$	10,876		$	(4,979	)	$	5,897


	Three Months Ended September 30, 2012									Nine Months Ended September 30, 2012
	As Reported			Adjustments			As Restated			As Reported			Adjustments			As Restated
	(In thousands, except per share amounts)
Net loss	$	(25,988	)	$	(4,461	)	$	(30,449	)	$	(29,433	)	$	7,524		$	(21,909	)
Reclassified to earnings, net of provision for (benefit from) income taxes of $—,$—, $— and $—, $161, $161		—			—			—			—			(298	)		(298	)
Unrealized hedging gains, net of provision for (benefit from) income taxes of $3,889, ($3,889), $— and ($4,620), $4,620, $—		(7,223	)		7,223			—			8,580			(8,580	)		—
Net change in unrealized gains and losses on marketable securities, net of benefit from (provision for) income taxes of $46, $—, $46 and $7,520, $—,$7,520		(86	)		—			(86	)		(13,966	)		—			(13,966	)

Other comprehensive income (loss)		(7,309	)		7,223			(86	)		(5,386	)		(8,878	)		(14,264	)

Comprehensive income (loss)	$	(33,297	)	$	2,762		$	(30,535	)	$	(34,819	)	$	(1,354	)	$	(36,173	)

Consolidated Statement Of Stockholders' Equity

CONSOLIDATED STATEMENT OF STOCKHOLDERS’ EQUITY

(Unaudited)


	Common Shares		Common Stock-Par Value		Additional Paid-in Capital			Retained Earnings			Accumulated Other Comprehensive Income			Total
	(In thousands)
Balance at December 31, 2011		48,125	$	24,063	$	468,709		$	524,377		$	20,476		$	1,037,625
Stock-based compensation		37		18		10,171			—			—			10,189
Excess income taxes from stock-based compensation		—		—		(1,681	)		—			—			(1,681	)
Net loss – as restated		—		—		—			(21,909	)		—			(21,909	)
Other comprehensive loss – as restated		—		—		—			—			(14,264	)		(14,264	)

Balance at September 30, 2012 – as restated		48,162	$	24,081	$	477,199		$	502,468		$	6,212		$	1,009,960

Consolidated Statements Of Cash Flows

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)


	Three Months Ended March 31, 2012									Six Months Ended June 30, 2012									Nine Months Ended September 30, 2012
	As Reported			Adjustments			As Restated			As Reported			Adjustments			As Restated			As Reported			Adjustments			As Restated
	(In thousands)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income ( loss)	$	6,859		$	(5,484	)	$	1,375		$	(3,445	)	$	11,985		$	8,540		$	(29,433	)	$	7,524		$	(21,909	)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Gain on sale of assets		(33,348	)		—			(33,348	)		(53,686	)		—			(53,686	)		(50,892	)		—			(50,892	)
Deferred income taxes		8,072			(4,441	)		3,631			416			11,390			11,806			(11,151	)		3,798			(7,353	)
Dry hole costs and leasehold impairments		1,315			—			1,315			1,315			—			1,315			2,685			—			2,685
Impairment of oil and gas properties		49			—			49			5,350			—			5,350			5,350			—			5,350
Depreciation, depletion and amortization		79,097			—			79,097			169,180			—			169,180			268,410			—			268,410
Unrealized gains from derivatives		262			9,925			10,187			—			(24,610	)		(24,610	)		—			(13,498	)		(13,498	)
Debt issuance cost and discount amortization		944			—			944			2,103			—			2,103			3,689			—			3,689
Stock-based compensation		3,535			—			3,535			6,860			—			6,860			10,189			—			10,189
Excess income taxes from stock-based compensation		1,405			—			1,405			1,670			—			1,670			1,681			—			1,681
Decrease in accounts receivable		1,815			—			1,815			11,611			1,235			12,846			1,826			2,176			4,002
Increase in other current assets		(199	)		—			(199	)		(4,097	)		—			(4,097	)		(5,059	)		—			(5,059	)
Increase in accounts payable and accrued expenses		63,374			—			63,374			4,621			—			4,621			28,403			—			28,403

Net cash provided by operating activities		133,180			—			133,180			141,898			—			141,898			225,698			—			225,698

CASH FLOWS FROM INVESTING ACTIVITIES:
Net cash used for investing activities		(146,423	)		—			(146,423	)		(164,560	)		—			(164,560	)		(264,119	)		—			(264,119	)

CASH FLOWS FROM FINANCING ACTIVITIES:
Net cash provided by financing activities		8,533			—			8,533			17,707			—			17,707			32,530			—			32,530

Net decrease in cash and cash equivalents		(4,710	)		—			(4,710	)		(4,955	)		—			(4,955	)		(5,891	)		—			(5,891	)
Cash and cash equivalents, beginning of the year		8,460			—			8,460			8,460			—			8,460			8,460			—			8,460

Cash and cash equivalents, end of the year	$	3,750		$	—		$	3,750		$	3,505		$	—		$	3,505		$	2,569		$	—		$	2,569

- Definition

Tabular disclosure of the results of operations for oil and gas producing activities for the year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62246-109447

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 27
-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62352-109447

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-10.(a)(17)(ii),(c)(3)(ii)(A)(1))
-URI http://asc.fasb.org/extlink&oid=21918352&loc=d3e511914-122862

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 25
-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62259-109447

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62094-109447

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 26
-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62299-109447

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 55
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=8451751&loc=d3e63071-109448

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62395-109447

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 19
-Paragraph 59S, 59T, 59U, 59V, 59W, 59X
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Oil and Gas Reserves Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Summary of Changes in Net Quantities of Crude Oil and Natural Gas Reserves

Set forth below is a summary of the changes in Comstock’s net quantities of oil and natural gas reserves for each of the three years ended December 31, 2012:


	2010						2011						2012
	Oil (MBbls)			Natural Gas (MMcf)			Oil (MBbls)			Natural Gas (MMcf)			Oil (MBbls)			Natural Gas (MMcf)
Proved Reserves:
Beginning of year		7,214			682,389			4,219			1,025,633			32,099			1,118,632
Revisions of previous estimates		351			(6,137	)		8			(36,150	)		(397	)		(531,335	)
Extensions and discoveries		1,484			421,657			9,845			169,188			17,312			31,050
Purchases of minerals in place		—			—			18,865			50,554			—			—
Disposals of minerals in place		(4,115	)		(3,303	)		—			—			(7,486	)		(59,257	)
Production		(715	)		(68,973	)		(838	)		(90,593	)		(2,309	)		(82,490	)

End of year		4,219			1,025,633			32,099			1,118,632			39,219			476,600

Proved Developed Reserves:
Beginning of year		4,894			367,102			2,961			506,809			8,405			550,474

End of year		2,961			506,809			8,405			550,474			12,308			368,775

Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Reserves

The following table sets forth the standardized measure of discounted future net cash flows relating to proved reserves at December 31, 2011 and 2012:


	2011			2012
	(In thousands)
Cash Flows Relating to Proved Reserves:
Future Cash Flows	$	7,656,654		$	5,064,519
Future Costs:
Production		(2,259,147	)		(1,585,309	)
Development and Abandonment		(2,174,656	)		(1,165,991	)
Future Income Taxes		(843,266	)		(552,843	)

Future Net Cash Flows		2,379,585			1,760,376
10% Discount Factor		(1,266,090	)		(976,159	)

Standardized Measure of Discounted Future Net Cash Flows	$	1,113,495		$	784,217

Changes in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Reserves

The following table sets forth the changes in the standardized measure of discounted future net cash flows relating to proved reserves for the years ended December 31, 2010, 2011 and 2012:


	2010			2011			2012
	(In thousands)
Standardized Measure, Beginning of Year	$	426,590		$	606,136		$	1,113,495
Net change in sales price, net of production costs		141,570			1,061			(428,469	)
Development costs incurred during the year which were previously estimated		69,216			205,418			211,020
Revisions of quantity estimates		(5,433	)		(50,398	)		(892,645	)
Accretion of discount		48,911			79,763			148,697
Changes in future development and abandonment costs		(15,201	)		10,151			653,824
Changes in timing and other		66,657			(58,049	)		(16,176	)
Extensions and discoveries		321,909			540,937			467,080
Purchases of minerals in place		—			316,118			—
Sales of minerals in place		(50,651	)		—			(261,971	)
Sales, net of production costs		(268,466	)		(355,654	)		(341,803	)
Net changes in income taxes		(128,966	)		(181,988	)		131,165

Standardized Measure, End of Year	$	606,136		$	1,113,495		$	784,217

- Definition

Tabular disclosure of the net quantities of an enterprise's interests in proved developed and undeveloped reserves of (a) crude oil (including condensate and natural gas liquids), (b) natural gas (including coal bed methane), (c) synthetic oil, (d) synthetic gas, and (e) other nonrenewable natural resources that are intended to be upgraded during the period as of the beginning of the period, changes in quantities during the period, and as of the end of the period.

+ References + Details

- Definition

Tabular disclosure of the future net cash flows relating to proved oil and gas reserves and oil and gas subject to purchase under long-term agreements in which the enterprise participates in the operation of the properties on which the oil and gas is located or otherwise serves as the producer. This information is presented in aggregate and for each geographic area for which reserve quantities are disclosed.

+ References + Details

Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	3 Months Ended					12 Months Ended
	Dec. 31, 2012 USD ($) shares	Sep. 30, 2012 USD ($)	Mar. 31, 2012 USD ($)	Sep. 30, 2011 USD ($)	Mar. 31, 2011 USD ($)	Dec. 31, 2012 USD ($) Customer shares bbl	Dec. 31, 2011 USD ($) Customer shares bbl	Dec. 31, 2010 USD ($) Customer shares
Operations And Summary Of Significant Accounting Policies [Line Items]
Estimated fair value of Stone Energy Corporation common stock held for sale	$ 12,312					$ 12,312	$ 47,642
Proceeds from sale of Stone Energy Corporation common stock available for sale						37,705	53,417	$ 30,499
Realized gain on available-for-sale securities before income tax						$ 26,600	$ 35,100	16,500
Quantity of barrels in swap agreements \| bbl						2,160,000	1,440,000
Fair value of swap agreements	11,651					$ 11,651
Unrealized gain in swap agreements						(298)	$ 298
Income taxes on other comprehensive gain						$ (161)	161
Conversion ratio of oil to natural gas in units of production						One barrel of oil for six thousand cubic feet of natural gas
Impairment of unproved oil and natural gas properties	58,615	$ 1,370	$ 1,315	$ 364	$ 9,454	$ 61,300	9,800
Impairment charges related to oil and gas properties						$ 25,400	$ 60,800	$ 200
Number of major customers of oil and gas sales \| Customer						2	2	1
General and administrative expenses reimbursements of overhead costs						$ 11,500	$ 10,500	$ 10,600
Interest costs, capitalized during period						20,900	13,200	$ 13,000
Oil swap agreement [Member]
Operations And Summary Of Significant Accounting Policies [Line Items]
Fair value of swap agreements	$ 11,700					$ 11,700	500
Unrealized gain in swap agreements							300
Income taxes on other comprehensive gain							$ 200
Major Purchaser one [Member]
Operations And Summary Of Significant Accounting Policies [Line Items]
Percentage accounted of oil and gas sales						42.00%	49.00%	39.00%
Major Purchaser two [Member]
Operations And Summary Of Significant Accounting Policies [Line Items]
Percentage accounted of oil and gas sales						27.00%	14.00%
Performance Share Units (PSU) [Member]
Operations And Summary Of Significant Accounting Policies [Line Items]
Performance multiplier, minimum						0.00%
Performance multiplier, maximum						300.00%
Restricted Stock [Member]
Operations And Summary Of Significant Accounting Policies [Line Items]
Shares of unvested restricted stock outstanding \| shares	1,960,835					1,960,835	2,114,520	2,069,275
Fair value [Member]
Operations And Summary Of Significant Accounting Policies [Line Items]
Cost basis of Stone Energy Corporation common stock held for sale	$ 5,500					$ 5,500	$ 16,600
Estimated fair value of Stone Energy Corporation common stock held for sale	$ 12,300					$ 12,300	$ 47,600
Common stock marketable securities [Member]
Operations And Summary Of Significant Accounting Policies [Line Items]
Shares of Stone Energy Corporation common stock held by company \| shares	600,000					600,000	1,806,000
Unrealized gain on available sale securities net of tax	$ 4,400					$ 4,400	$ 20,200
Shares of Stone Energy Corporation common stock sold by Company \| shares						1,206,000	1,991,000	1,520,000
Proceeds from sale of Stone Energy Corporation common stock available for sale						$ 37,700	$ 53,400	$ 30,500
Minimum [Member]
Operations And Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful lives						3 years
Maximum [Member]
Operations And Summary Of Significant Accounting Policies [Line Items]
Property and equipment estimated useful lives						31 years 6 months

Summary of Significant Accounting Policies - Other Current Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Other Current Assets [Line Items]
Other Current Assets	$ 6,954	$ 2,796
Pipe and oil field equipment inventory [Member]
Schedule Of Other Current Assets [Line Items]
Other Current Assets	1,922	2,314
Production tax refunds receivable [Member]
Schedule Of Other Current Assets [Line Items]
Other Current Assets	1,830
Derivative settlements receivable [Member]
Schedule Of Other Current Assets [Line Items]
Other Current Assets	1,693
Drilling advances [Member]
Schedule Of Other Current Assets [Line Items]
Other Current Assets	1,160
Prepaid expenses [Member]
Schedule Of Other Current Assets [Line Items]
Other Current Assets	300	397
Other [Member]
Schedule Of Other Current Assets [Line Items]
Other Current Assets	$ 49	$ 85

Summary of Significant Accounting Policies - Summary of Financial Assets at Fair Value (Detail) - Fair Value, Measurements, Recurring [Member] $ in Thousands	Dec. 31, 2012 USD ($)
Assets measured at fair value on a recurring basis:
Cash held in bank accounts	$ 4,471
Marketable securities	12,312
Derivative financial instruments	11,651
Total assets	28,434
Level 1 [Member]
Assets measured at fair value on a recurring basis:
Cash held in bank accounts	4,471
Marketable securities	12,312
Total assets	16,783
Level 2 [Member]
Assets measured at fair value on a recurring basis:
Derivative financial instruments	11,651
Total assets	$ 11,651

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

+ References + Details

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

+ References + Details

- Definition

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References + Details

Summary of Significant Accounting Policies - Summary of Changes in Fair Value Level 2 Assets of Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Fair Value Disclosures [Line Items]
Balance beginning of period	$ 459
Purchases and settlements (net)	(9,766)
Total realized or unrealized gains
Realized gains included in earnings	9,766
Unrealized gains included in earnings	11,651
Unrealized gains included in other comprehensive income	(459)	459
Balance end of period	$ 11,651	$ 459

Summary of Significant Accounting Policies - Carrying Amounts and Estimated Fair Value of Other Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Debt Disclosure [Line Items]
Long-term debt, including current portion, Carrying Value	$ 1,324,383	$ 1,196,908
Long-term debt, including current portion, Fair Value	$ 1,382,000	$ 1,167,000

Summary of Significant Accounting Policies - Summary of Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Accrued Expenses [Line Items]
Accrued drilling costs	$ 14,050	$ 29,291
Accrued interest payable	12,351	11,113
Advance from joint venture partner	7,286
Accrued oil and gas property acquisition costs	2,413	31,988
Other	11,272	13,110
Total accrued expenses	$ 47,372	$ 85,502

- Definition

Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References + Details

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References + Details

Summary of Significant Accounting Policies - Summary of Changes in Reserve for Future Abandonment Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Asset Retirement Obligation [Line Items]
Reserve for Future Abandonment Costs at beginning of the year	$ 13,997	$ 6,674	$ 6,561
New wells placed on production	1,837	417	338
Changes in estimates	2,736	5,839	596
Acquisition liabilities assumed		741
Liabilities settled and assets disposed of	(1,304)	(56)	(1,212)
Accretion expense	728	382	391
Reserve for Future Abandonment Costs at end of the year	$ 17,994	$ 13,997	$ 6,674

Summary of Significant Accounting Policies - Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended					12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Earnings Per Share [Line Items]
Net loss	$ (78,151)	$ (41,134)	$ 1,309	$ 3,949	$ 2,404	$ (100,060)	$ (33,472)	$ (19,586)
Income Allocable to Unvested Stock Grants
Basic Net Loss Attributable to Common Stock						(100,060)	(33,472)	(19,586)
Effect of Dilutive Securities: Stock Options
Effect of Dilutive Securities: Performance Stock Units
Diluted Net Loss Attributable to Common Stock						$ (100,060)	$ (33,472)	$ (19,586)
Basic Net Loss Attributable to Common Stock, Shares						46,422	45,997	45,561
Effect of Dilutive Securities: Stock Options, Shares
Effect of Dilutive Securities: Performance Stock Units, Shares
Diluted Net Loss Attributable to Common Stock, Shares						46,422	45,997	45,561
Basic Net Loss Attributable to Common Stock, Per Share	$ (1.68)	$ (0.89)	$ 0.03	$ 0.08	$ 0.05	$ (2.16)	$ (0.73)	$ (0.43)
Diluted Net Loss Attributable to Common Stock, Per Share	$ (1.68)	$ (0.89)	$ 0.03	$ 0.08	$ 0.05	$ (2.16)	$ (0.73)	$ (0.43)

Summary of Significant Accounting Policies - Weighted Average Shares of Unvested Restricted Stock (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Unvested restricted stock	1,737	1,683	1,715

Summary of Significant Accounting Policies - Common Stock Stock Options Excluded as Anti-Dilutive from Determination of Diluted Earnings Per Share (Detail) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average anti-dilutive stock options	168	215	240
Weighted average exercise price	$ 37.81	$ 36.42	$ 35.98

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 13, 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Summary of Significant Accounting Policies - Cash Payments Made for Interest and Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash Payments:
Interest payments	$ 79,001	$ 49,109	$ 40,467
Income tax refunds	$ (58)	$ (1,403)	$ (48,575)

Summary of Significant Accounting Policies - Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended					12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net loss	$ (78,151)	$ (41,134)	$ 1,309	$ 3,949	$ 2,404	$ (100,060)	$ (33,472)	$ (19,586)
Other comprehensive income (loss):
Realized gains on marketable securities reclassified to earnings, net of provision for income taxes of ($5,785) in 2010, ($12,291) in 2011 and ($9,318) in 2012						(17,303)	(22,827)	(10,744)
Unrealized hedging gains, net of provision for (benefit from) income taxes of $161 in 2011 and ($161) in 2012						(298)	298
Unrealized gains on marketable securities, net of provision for income taxes of $6,707 in 2010, $5,748 in 2011 and $831 in 2012						1,543	10,675	12,455
Comprehensive loss						$ (116,118)	$ (45,326)	$ (17,875)

- Definition

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

Summary of Significant Accounting Policies - Comprehensive Loss (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Provision for income taxes on realized gains on marketable securities reclassified to earnings	$ (9,318)	$ (12,291)	$ (5,785)
Provision for (benefit from) income taxes on unrealized hedging gains	(161)	161
Provision for income taxes on unrealized gains on marketable securities	$ 831	$ 5,748	$ 6,707

Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income, Net of Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]
Beginning Balance, Oil Price Swap Agreements	$ 298
Reclassification to earnings, Oil Price Swap Agreements	(298)
Changes in value, Oil Price Swap Agreements		$ 298
Ending Balance, Oil Price Swap Agreements		298
Beginning Balance, Marketable Securities	20,178	32,330	$ 30,619
Reclassification to earnings, Marketable Securities	(17,303)	(22,827)	(10,744)
Changes in value, Marketable Securities	1,543	10,675	12,455
Ending Balance, Marketable Securities	4,418	20,178	32,330
Beginning Balance, Total Accumulated Comprehensive Income	20,476	32,330	30,619
Reclassification to earnings, Total Accumulated Comprehensive Income	(17,601)	(22,827)	(10,744)
Changes in value, Total Accumulated Comprehensive Income	1,543	10,973	12,455
Ending Balance, Total Accumulated Comprehensive Income	$ 4,418	$ 20,476	$ 32,330

Acquisitions and Dispositions of Oil and Gas Properties - Additional Information (Detail) $ in Thousands, Mcfe in Millions, Boe in Millions	12 Months Ended
	Dec. 31, 2012 USD ($) a Boe $ / a Well	Dec. 31, 2011 USD ($) a Mcfe	Jul. 30, 2012 USD ($)
Business Acquisition [Line Items]
Total cash consideration paid	$ 337,896
Exchange transaction completion date	May 2012
Acquisition of oil and gas properties	$ 337,896
Net proceeds from sale of oil and gas properties	119,800
Gain on sale of oil and gas properties	$ 26,000
Total net acres in joint venture area \| a	28,160
JV Partner Participation Cost Per Acre \| $ / a	25,000
Joint Venture expected acres per well drilled \| a	80
Joint Venture wells with JV Partner acreage participation conditional commitment \| Well	100
JV partner total working interest per well	33.00%
JV partner acreage participation working interest per well	33.00%
JV partner drilling cost working interest	33.00%
Payments received from KKR for initial participation in wells spud			$ 23,800
Formation costs incurred	$ 1,700
Payment received from joint venture partner for acreage and facility reimbursements	8,700
North Louisiana [Member]
Business Acquisition [Line Items]
Acquisition of proved oil and gas reserves \| Mcfe		13.0
Acquisition of leases covering area, net \| a		3,500
Acquisition of oil and gas properties		$ 27,100
Delaware Basin [Member]
Business Acquisition [Line Items]
Total cash consideration paid	$ 337,900
Acquisition of proved oil and gas reserves \| Boe	25.2
Acquisition of leases covering area, net \| a	43,591
Net proceeds from sale of oil and gas properties	$ 24,800

Acquisitions and Dispositions of Oil and Gas Properties - Purchase Price Allocation including Final Post-Closing Adjustments (Detail) $ in Thousands	Dec. 31, 2012 USD ($)
Consideration paid:
Cash	$ 337,896
Total consideration paid	$ 337,896

Acquisitions and Dispositions of Oil and Gas Properties - Amounts Recognized for Fair Value of Assets Acquired and Liabilities Assumed (Detail) $ in Thousands	Dec. 31, 2012 USD ($)
Business Acquisition [Line Items]
Proved properties	$ 205,758
Unproved properties	143,751
Asset retirement obligation	(741)
Liabilities assumed	(10,872)
Net fair value of properties acquired and liabilities assumed	$ 337,896

Oil and Gas Producing Activities - Capitalized Costs Related to Oil and Gas Property Acquisition Exploration and Development Activities (Detail) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Capitalized Costs [Line Items]
Unproved properties	$ 263,652	$ 369,096
Proved properties:
Leasehold costs	1,125,460	1,162,094
Wells and related equipment and facilities	2,654,256	2,314,052
Accumulated depreciation depletion and amortization	(1,588,046)	(1,349,871)
Capitalized Costs, Oil and Gas Producing Activities, Net, Total	$ 2,455,322	$ 2,495,371

Oil and Gas Producing Activities - Costs Incurred Related to Oil and Gas Property Acquisition Exploration and Development Activities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property Acquisitions:
Unproved property acquisitions	$ 29,677	$ 255,699	$ 134,728
Proved property acquisitions	3,235	219,402
Development costs	514,629	496,506	315,041
Exploration costs	5,522	83,182	87,823
Costs Incurred, Acquisition of Oil and Gas Properties, Total	$ 553,063	$ 1,054,789	$ 537,592

- Definition

Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have proved reserves.

+ References + Details

- Definition

Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have unproved reserves.

+ References + Details

Long-term Debt - Long-term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Long-term debt	$ 1,324,383	$ 1,196,908
Bank credit facility [Member]
Debt Instrument [Line Items]
Long-term debt	440,000	600,000
8 3/8% senior notes due 2017 [Member]
Debt Instrument [Line Items]
Long-term debt	300,000	300,000
Discount related to 8 3/8% senior notes due 2017 [Member]
Debt Instrument [Line Items]
Long-term debt	(2,556)	(3,092)
7 3/4% senior notes due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt	300,000	$ 300,000
9 1/2% senior notes due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt	300,000
Discount related to 9 1/2% senior notes due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt	$ (13,061)

Long-term Debt - Debt by Year of Maturity (Detail) $ in Thousands	Dec. 31, 2012 USD ($)
Debt Instrument [Line Items]
2013
2014
2015	440,000
2016
2017	297,444
Thereafter	586,939
Long-term debt	1,324,383
Bank credit facility [Member]
Debt Instrument [Line Items]
2013
2014
2015	440,000
2016
2017
Thereafter
Long-term debt	440,000
8 3/8% senior notes due 2017 [Member]
Debt Instrument [Line Items]
2013
2014
2015
2016
2017	297,444
Thereafter
Long-term debt	297,444
7 3/4% senior notes due 2019 [Member]
Debt Instrument [Line Items]
2013
2014
2015
2016
2017
Thereafter	300,000
Long-term debt	300,000
9 1/2% senior notes due 2020 [Member]
Debt Instrument [Line Items]
2013
2014
2015
2016
2017
Thereafter	286,939
Long-term debt	$ 286,939

Long-term Debt - Debt by Year of Maturity (Parenthetical) (Detail)	Dec. 31, 2012
8 3/8% senior notes due 2017 [Member]
Debt Instrument [Line Items]
Interest rate on senior notes	8.375%
7 3/4% senior notes due 2019 [Member]
Debt Instrument [Line Items]
Interest rate on senior notes	7.75%
9 1/2% senior notes due 2020 [Member]
Debt Instrument [Line Items]
Interest rate on senior notes	9.50%

Long-term Debt - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jun. 05, 2012	Mar. 14, 2011
Debt Instrument [Line Items]
Repurchase of senior notes due 2012	$ 390,000	$ 287,000	$ 68,000
Bank credit facility [Member]
Debt Instrument [Line Items]
Bank credit facility	$ 850,000
Line of credit facility commitment term (in years)	5 years
Maturity of credit facility	Nov. 30, 2015
Borrowing base	$ 570,000
Availability of borrowing base	$ 130,000
Minimum spread rate over LIBOR for interest rate on credit facility	1.75%
Maximum spread rate over LIBOR for interest rate on credit facility	2.75%
Stated percentage over federal funds rate to calculate base rate	0.50%
Stated percentage over 30 day LIBOR to calculate base rate	1.00%
Minimum spread rate over base rate for interest rate on credit facility	0.75%
Maximum spread rate over base rate for interest rate on credit facility	1.75%
Maximum amount of cash dividends without restriction under credit facility	$ 50,000
Commitment fee on unused borrowing base	0.50%
Ownership percentage of guarantor subsidiary	100.00%
9 1/2% senior notes due 2020 [Member]
Debt Instrument [Line Items]
Outstanding senior notes	$ 300,000
Interest rate on senior notes	9.50%
Maturity of senior notes	Jun. 15, 2020
Face amount of senior note				$ 300,000
8 3/8% senior notes due 2017 [Member]
Debt Instrument [Line Items]
Outstanding senior notes	$ 300,000
Interest rate on senior notes	8.375%
Maturity of senior notes	Oct. 15, 2017
6 7/8% senior notes due 2012 [Member]
Debt Instrument [Line Items]
Outstanding senior notes			$ 172,000
Interest rate on senior notes			6.875%
Repurchase of senior notes due 2012		172,400
Loss resulted due to early extinguishment of senior notes		$ 1,100
7 3/4% senior notes due 2019 [Member]
Debt Instrument [Line Items]
Outstanding senior notes	$ 300,000
Interest rate on senior notes	7.75%
Maturity of senior notes	Apr. 01, 2019
Face amount of senior note					$ 300,000

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Commitments And Contingencies [Line Items]
Rent expense under noncancelable operating leases	$ 1.4	$ 1.1	$ 1.3
Commitments for contracted drilling rigs	$ 65.3
Contract term related to drilling rigs	Through November 2015
Natural gas transportation agreements	Through July 2019
Maximum commitments under natural gas transportation agreements	$ 25.3

Commitments and Contingencies - Minimum Future Payments under Leases (Detail) $ in Thousands	Dec. 31, 2012 USD ($)
Commitments And Contingencies [Line Items]
2013	$ 1,983
2014	2,012
2015	2,038
2016	1,994
2017	2,021
Thereafter	6,740
Operating Leases, Future Minimum Payments Due, Total	$ 16,788

Stockholders' Equity - Additional Information (Detail) - $ / shares	Dec. 31, 2012	Dec. 31, 2011
Stockholders Equity [Line Items]
Common stock, shares authorized	75,000,000	75,000,000
Common stock, par value	$ 0.50	$ 0.50
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, par value per share	$ 10.00	$ 10.00
Preferred stock, shares outstanding	0	0

Stock-based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense recognized	$ 13.7	$ 15.0	$ 17.4
Income tax benefit realized from tax deductions associated with stock-based compensation			1.5
Income tax provision realized from tax deductions associated with stock-based compensation	1.7	0.6
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense recognized	$ 13.5	$ 15.0	$ 17.0
Grant date fair value of share units , per share	$ 15.49	$ 18.31	$ 25.61
Unrecognized compensation cost related to unvested restricted stock	$ 19.1
Compensation cost expected to be recognized period	2 years 3 months 18 days
Fair value of restricted stock vested	$ 6.7	$ 9.3	$ 15.1
2009 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term Incentive Plan provides for future awards of stock options, restricted stock grants or other equity awards	1,607,372
Performance Share Units (PSU) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value of share units , per share	$ 21.14
Performance Periods	The performance periods consist of one year, two years and three years, respectively
Performance share units, risk free interest rate	0.40%
Performance share units, Minimum volatility	29.00%
Performance share units, Maximum volatility	70.00%
Number of performance share units, granted	254,133
Number of performance share units, outstanding	254,133
Grant date fair value of performance share units	$ 5.4
Performance multiplier, minimum	0.00%
Performance multiplier, maximum	300.00%
Performance multiplier assumed	100.00%
Minimum final number of shares of common stock issuable based on performance multiplier	0
Maximum final number of shares of common stock issuable based on performance multiplier	688,545
Total compensation expense recorded for performance share units	$ 0.2
Unrecognized expense, performance share units	$ 5.2
Term for Amortization of Performance Share Compensation cost	Through December 2015
Minimum [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amortized vesting period of restricted stock			1 year
Maximum [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amortized vesting period of restricted stock			4 years
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense recognized			$ 0.4
Total intrinsic value of options outstanding	$ 0.0	$ 0.0
Number of option, Exercised	0	0
Latest year with option issuances	2008

Stock-based Compensation - Stock Options Outstanding (Detail)	12 Months Ended
	Dec. 31, 2012 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options Outstanding	157,150
Number of Options Exercisable	157,150
Range One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price \| $ / shares	$ 32.50
Weighted Average Remaining Life (in years)	2 years 10 months 24 days
Number of Options Outstanding	51,500
Number of Options Exercisable	51,500
Range Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price \| $ / shares	$ 33.22
Weighted Average Remaining Life (in years)	4 years
Number of Options Outstanding	65,650
Number of Options Exercisable	65,650
Range Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price \| $ / shares	$ 54.36
Weighted Average Remaining Life (in years)	4 months 24 days
Number of Options Outstanding	40,000
Number of Options Exercisable	40,000

Stock-based Compensation - Stock Option Activity under Company's Incentive Plans (Detail)	12 Months Ended
	Dec. 31, 2012 $ / shares shares
Stock Option Activity Under The Company's Incentive Plans [Line Items]
Beginning Balance, Outstanding, Number of Options \| shares	203,150
Number of options, Expired and forfeited \| shares	(46,000)
Ending Balance, Outstanding, Number of options \| shares	157,150
Ending Balance, Vested and Exercisable, Number of Options \| shares	157,150
Beginning of Period, Outstanding, Weighted Average Exercise Price \| $ / shares	$ 36.64
Weighted Average Exercise Price, Expired and forfeited \| $ / shares	30.74
Ending of Period, Outstanding, Weighted Average Exercise Price \| $ / shares	38.36
Ending Balance, Vested and Exercisable, Weighted Average Exercise Price \| $ / shares	$ 38.36

Stock-based Compensation - Options Exercised and Tax Benefit Realized (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Options Exercised And Tax Benefit Realized [Line Items]
Cash received for options exercised			$ 1,427
Actual tax benefit realized			$ 4,221

- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (j)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 19
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph i
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Stock-based Compensation - Summary of Restricted Stock Activity (Detail) - Restricted Stock [Member] - $ / shares	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Number of Restricted Shares, Outstanding	2,114,520	2,069,275
Number of Restricted Shares, Granted	303,530
Number of Restricted Shares, Vested	(437,123)
Number of Restricted Shares, Forfeitures	(20,092)
Ending Balance, Number of Restricted Shares, Outstanding	1,960,835	2,114,520	2,069,275
Beginning Balance, Weighted Average Grant Price, Outstanding	$ 31.25
Weighted Average Grant Price, Granted	15.49	$ 18.31	$ 25.61
Weighted Average Grant Price, Vested	35.07
Weighted Average Grant Price, Forfeitures	26.10
Ending Balance, Weighted Average Grant Price, Outstanding	$ 28.01	$ 31.25

Retirement Plan - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Retirement Plan [Line Items]
Matching contributions to the plan	$ 365,000	$ 323,000	$ 341,000

Income Taxes - Income Tax Benefit (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Benefit [Line Items]
Current	$ (162)	$ 28	$ (229)
Deferred	(47,192)	(14,652)	(4,617)
Benefit from income taxes	$ (47,354)	$ (14,624)	$ (4,846)

- Definition

The component of income tax expense for the period representing amounts of income taxes paid or payable (or refundable) for the period for all income tax obligations as determined by applying the provisions of relevant enacted tax laws to relevant amounts of taxable Income or Loss from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Current Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6509736

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
-URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 289
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Deferred Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6510177

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.7)
-URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 289
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section I
-Subsection 7

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Income Taxes - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2012 USD ($) Jurisdictions	Dec. 31, 2011 USD ($)	Dec. 31, 2010
Income Taxes [Line Items]
Customary Rate	35.00%	35.00%	35.00%
Valuation allowance on net operating loss carryforwards	$ 23,009	$ 19,630
State jurisdictions currently under review \| Jurisdictions	2
U.S. Federal [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	$ 36,900
Net operating loss carryforwards limitation on use	Limited to approximately $1.1 million per year pursuant to a prior change of control of an acquired company
Net operating loss carryforwards limitations	$ 1,100
Valuation allowance on net operating loss carryforwards	23,000
Tax effect of valuation allowance on net operating loss carryforwards	8,000
Louisiana [Member]
Income Taxes [Line Items]
Valuation allowance on net operating loss carryforwards	288,000
Tax effect of valuation allowance on net operating loss carryforwards	$ 15,000

Income Taxes - Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Line Items]
Tax benefit at statutory rate	$ (51,595)	$ (16,834)	$ (8,551)
Tax effect of:
Nondeductible compensation	2,545	2,753	4,253
State taxes, net of federal tax benefit	1,486	(741)	(343)
Net operating loss carryback adjustments			(369)
Other	210	198	164
Total	$ (47,354)	$ (14,624)	$ (4,846)

- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to pretax Income or Loss from continuing operations; income tax expense or benefit may include interest and penalties on tax uncertainties based on the entity's accounting policy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 25
-URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e32247-109318

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32672-109319

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 45, 46
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 48
-Paragraph 15, 16, 19
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Income Taxes - Difference Between Customary Rate and Effective Tax Rate on Income Before Income Taxes Due (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Line Items]
Statutory rate	35.00%	35.00%	35.00%
Tax effect of:
Nondeductible compensation	(1.70%)	(5.70%)	(17.40%)
State taxes, net of federal tax benefit	(1.00%)	1.50%	1.40%
Net operating loss carryback adjustments			1.50%
Other	(0.20%)	(0.40%)	(0.70%)
Effective tax rate	32.10%	30.40%	19.80%

Income Taxes - Tax Effects of Significant Temporary Differences Representing Net Deferred Tax Asset and Liability (Detail) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Current deferred tax liabilities:
Marketable securities	$ (1,262)	$ (7,503)
Derivative financial instruments	(4,078)	(161)
Net current deferred tax liability	(5,340)	(7,664)
Noncurrent deferred tax liabilities:
Property and equipment	(247,062)	(253,580)
Other assets	8,319	8,772
Net operating loss carryforwards	95,180	47,320
Alternative minimum tax carryforward	19,080	19,093
Valuation allowance on net operating loss carryforwards	(23,009)	(19,630)
Other	(2,409)	(3,680)
Net noncurrent deferred tax liability	(149,901)	(201,705)
Net deferred tax liability	$ (155,241)	$ (209,369)

Income Taxes - Carryforwards Available to Reduce Future Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Carryforward Available To Reduce Future Income Taxes [Line Items]
Alternative minimum tax credits carryforward	$ 19,080	$ 19,093
Years of Expiration Carryforward Unlimited [Member]
Carryforward Available To Reduce Future Income Taxes [Line Items]
Alternative minimum tax credits carryforward	$ 19,080
U.S. Federal [Member]
Carryforward Available To Reduce Future Income Taxes [Line Items]
Net operating loss, Years of Expiration Carryforward	2017 - 2032
Net operating loss, Tax Credit Carryforward, Amount	$ 192,255
Louisiana [Member]
Carryforward Available To Reduce Future Income Taxes [Line Items]
Net operating loss, Years of Expiration Carryforward	2012 - 2027
Net operating loss, Tax Credit Carryforward, Amount	$ 536,365

Derivative Financial Instruments and Hedging Activities - Additional Information (Detail) MBbls in Thousands	12 Months Ended
	Dec. 31, 2012 USD ($) MBbls	Dec. 31, 2011 USD ($)
Derivative Instruments And Hedging Activities [Line Items]
Realized gains on crude oil price swaps	$ 9,800,000
Derivative asset at fair value	11,651,000
Derivative asset at carrying value	11,651,000
Derivative asset current at carrying value	$ 11,651,000	$ 459,000
Contract terms 2012 oil production [Member]
Derivative Instruments And Hedging Activities [Line Items]
Quantity of crude oil for which swap entered \| MBbls	1,710
NYMEX price of crude oil swaps	$ 99.46

- Definition

Fair values as of the balance sheet date for all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments and which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Current Assets
-URI http://asc.fasb.org/extlink&oid=6509628

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FIN39-1
-Paragraph 10A, 10B
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Section A
-Paragraph 4
-Chapter 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 4, 17
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Derivative Financial Instruments and Hedging Activities - Summary of Outstanding Commodity Derivatives (Detail) - Oil Price Swap Agreements One [Member]	Dec. 31, 2012 $ / bbl bbl
Derivatives [Line Items]
Commodity Derivatives Volume \| bbl	2,160,000
Commodity Derivatives Beginning of Contract Period	Jan. 2013
Commodity Derivatives End of Contract Period	Dec. 2013
Commodity Derivatives Weighted Average Contract Price \| $ / bbl	98.67

Supplementary Quarterly Financial Data (Unaudited) - Schedule of Supplementary Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule Of Quarterly Financial Data [Line Items]
Total oil and gas sales	$ 106,603				$ 114,456	$ 119,422	$ 112,451	$ 88,038	$ 431,923	$ 434,367	$ 349,141
Income (loss) from operations	(102,036)				(53,517)	12,086	8,378	(8,263)	(131,660)	(41,316)	(12,004)
Net income (loss)	$ (78,151)				$ (41,134)	$ 1,309	$ 3,949	$ 2,404	$ (100,060)	$ (33,472)	$ (19,586)
Net income (loss) per share:
Basic	$ (1.68)				$ (0.89)	$ 0.03	$ 0.08	$ 0.05	$ (2.16)	$ (0.73)	$ (0.43)
Diluted	$ (1.68)				$ (0.89)	$ 0.03	$ 0.08	$ 0.05	$ (2.16)	$ (0.73)	$ (0.43)
As Restated [Member]
Schedule Of Quarterly Financial Data [Line Items]
Total oil and gas sales		$ 112,895	$ 100,736	$ 111,689
Income (loss) from operations		(24,419)	(8,046)	2,841
Net income (loss)		$ (30,449)	$ 7,165	$ 1,375
Net income (loss) per share:
Basic		$ (0.66)	$ 0.15	$ 0.03
Diluted		$ (0.66)	$ 0.15	$ 0.03

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.21)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 52
-URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.23)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 18
-Article 7

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 36, 37, 38
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 20
-Article 5

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 21
-Article 9

+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Supplementary Quarterly Financial Data (Unaudited) - Summary of Results of Operations from Non-Routine Items (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule Of Quarterly Financial Data [Line Items]
Gain on sale of oil and gas properties		$ (2,794)	$ 20,338	$ 6,727					$ 24,271
Gain on sales of marketable securities				26,621	$ 2,905	$ 2,484	$ 8,480	$ 21,249	26,621	$ 35,118	$ 16,529
Impairments of unproved oil and gas properties	$ (58,615)	$ (1,370)		(1,315)		$ (364)		$ (9,454)	(61,300)	(9,800)
Impairments of proved oil and gas properties	$ (20,018)		$ (5,301)	$ (49)	$ (60,817)				$ (25,368)	$ (60,817)

- Definition

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

+ References + Details

Supplementary Quarterly Financial Data (Unaudited) - Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
ASSETS
Cash and Cash Equivalents	$ 4,471				$ 8,460	$ 1,732	$ 90,472
Accounts Receivable	36,150				47,082
Marketable Securities	12,312				47,642
Derivative Financial Instruments	11,651				459
Other Current Assets	6,954				2,796
Total current assets	77,146				113,090
Net Property and Equipment	2,470,053				2,509,845
Other Assets	19,944				16,949
Total Assets	2,567,143				2,639,884
LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities	139,058				187,207
Long-term Debt	1,324,383				1,196,908
Deferred Income Taxes Payable	149,901				201,705
Reserve for Future Abandonment Costs	17,994				13,997	6,674	6,561
Other Non-Current Liabilities	2,273				2,442
Total liabilities	1,633,609				1,602,259
Commitments and Contingencies
Stockholders' Equity:
Common stock	24,204				24,063
Additional paid-in capital	480,595				468,709
Retained earnings	424,317				524,377
Accumulated other comprehensive income	4,418				20,476	32,330	30,619
Total Stockholders' Equity	933,534				1,037,625	$ 1,068,531	$ 1,066,111
Total liabilities and stockholders' equity	$ 2,567,143				2,639,884
As Reported [Member]
ASSETS
Cash and Cash Equivalents		$ 2,569	$ 3,505	$ 3,750	8,460
Restricted Cash				9,549
Accounts Receivable		51,907	42,122	51,918
Marketable Securities		15,072	15,204	17,154
Assets Held for Sale				91,520
Derivative Financial Instruments		10,823	18,536
Other Current Assets		7,658	6,695	2,908
Total current assets		88,029	86,062	176,799
Net Property and Equipment		2,546,024	2,547,219	2,517,672
Derivative Financial Instruments		2,836	6,235
Other Assets		20,950	21,796	16,201
Total Assets		2,657,839	2,661,312	2,710,672
LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities		200,086	176,726	250,060
Long-term Debt		1,238,809	1,223,235	1,207,042
Deferred Income Taxes Payable		190,784	203,530	208,078
Reserve for Future Abandonment Costs		14,545	14,191	13,536
Derivative Financial Instruments				2,205
Other Non-Current Liabilities		2,301	2,337	2,394
Total liabilities		1,646,525	1,620,019	1,683,315
Commitments and Contingencies
Stockholders' Equity:
Common stock		24,081	24,081	24,058
Additional paid-in capital		477,199	473,881	470,844
Retained earnings		494,944	520,932	531,236
Accumulated other comprehensive income		15,090	22,399	1,219
Total Stockholders' Equity		1,011,314	1,041,293	1,027,357
Total liabilities and stockholders' equity		2,657,839	2,661,312	2,710,672
Adjustments [Member]
ASSETS
Cash and Cash Equivalents
Accounts Receivable		(2,176)	(1,235)
Total current assets		(2,176)	(1,235)
Total Assets		(2,176)	(1,235)
LIABILITIES AND STOCKHOLDERS' EQUITY
Deferred Income Taxes Payable		(822)	2,881	(863)
Total liabilities		(822)	2,881	(863)
Commitments and Contingencies
Stockholders' Equity:
Retained earnings		7,524	11,985	(5,484)
Accumulated other comprehensive income		(8,878)	(16,101)	6,347
Total Stockholders' Equity		(1,354)	(4,116)	863
Total liabilities and stockholders' equity		(2,176)	(1,235)
As Restated [Member]
ASSETS
Cash and Cash Equivalents		2,569	3,505	3,750	8,460
Restricted Cash				9,549
Accounts Receivable		49,731	40,887	51,918
Marketable Securities		15,072	15,204	17,154
Assets Held for Sale				91,520
Derivative Financial Instruments		10,823	18,536
Other Current Assets		7,658	6,695	2,908
Total current assets		85,853	84,827	176,799
Net Property and Equipment		2,546,024	2,547,219	2,517,672
Derivative Financial Instruments		2,836	6,235
Other Assets		20,950	21,796	16,201
Total Assets		2,655,663	2,660,077	2,710,672
LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities		200,086	176,726	250,060
Long-term Debt		1,238,809	1,223,235	1,207,042
Deferred Income Taxes Payable		189,962	206,411	207,215
Reserve for Future Abandonment Costs		14,545	14,191	13,536
Derivative Financial Instruments				2,205
Other Non-Current Liabilities		2,301	2,337	2,394
Total liabilities		1,645,703	1,622,900	1,682,452
Commitments and Contingencies
Stockholders' Equity:
Common stock		24,081	24,081	24,058
Additional paid-in capital		477,199	473,881	470,844
Retained earnings		502,468	532,917	525,752
Accumulated other comprehensive income		6,212	6,298	7,566
Total Stockholders' Equity		1,009,960	1,037,177	1,028,220	$ 1,037,625
Total liabilities and stockholders' equity		$ 2,655,663	$ 2,660,077	$ 2,710,672

Supplementary Quarterly Financial Data (Unaudited) - Consolidated Statements of Operations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2012	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restated Results Of Operations [Line Items]
Oil and gas sales	$ 106,603				$ 114,456	$ 119,422	$ 112,451	$ 88,038			$ 431,923	$ 434,367	$ 349,141
Gain on sale of oil and gas properties		$ (2,794)	$ 20,338	$ 6,727							24,271
Total Revenues											456,194	434,367	349,141
Total operating expenses											587,854	475,683	361,145
Operating income (loss)	(102,036)				(53,517)	12,086	8,378	(8,263)			(131,660)	(41,316)	(12,004)
Other income (expenses):
Gain on sale of marketable securities				26,621	2,905	2,484	8,480	21,249			26,621	35,118	16,529
Interest expense											(64,575)	(42,688)	(29,456)
Total other income (expenses)											(15,754)	(6,780)	(12,428)
Income (loss) before income taxes											(147,414)	(48,096)	(24,432)
Benefit from (provision for) income taxes											47,354	14,624	4,846
Net income (loss)	$ (78,151)				$ (41,134)	$ 1,309	$ 3,949	$ 2,404			$ (100,060)	$ (33,472)	$ (19,586)
Net income (loss) per share:
Basic	$ (1.68)				$ (0.89)	$ 0.03	$ 0.08	$ 0.05			$ (2.16)	$ (0.73)	$ (0.43)
Diluted	$ (1.68)				$ (0.89)	$ 0.03	$ 0.08	$ 0.05			$ (2.16)	$ (0.73)	$ (0.43)
Weighted average shares outstanding:
Basic											46,422	45,997	45,561
Diluted											46,422	45,997	45,561
As Reported [Member]
Restated Results Of Operations [Line Items]
Oil and gas sales		117,129	104,690	110,335						$ 332,154
Gain on sale of oil and gas properties		(2,794)	20,338	6,727						24,271
Total Revenues		114,335	125,028	117,062						356,425
Total operating expenses		134,520	129,120	115,575						379,215
Operating income (loss)		(20,185)	(4,092)	1,487						(22,790)
Other income (expenses):
Gain on sale of marketable securities				26,621						26,621
Other income		153	545	(23)						675
Interest expense		(17,535)	(14,529)	(13,237)						(45,301)
Total other income (expenses)		(17,382)	(13,984)	13,361						(18,005)
Income (loss) before income taxes		(37,567)	(18,076)	14,848						(40,795)
Benefit from (provision for) income taxes		11,579	7,772	(7,989)						11,362
Net income (loss)		$ (25,988)	$ (10,304)	$ 6,859					$ (3,445)	$ (29,433)
Net income (loss) per share:
Basic		$ (0.56)	$ (0.22)	$ 0.14						$ (0.63)
Diluted		$ (0.56)	$ (0.22)	$ 0.14						$ (0.63)
Weighted average shares outstanding:
Basic		46,443	46,426	46,372						46,414
Diluted		46,443	46,426	46,372						46,414
Adjustments [Member]
Restated Results Of Operations [Line Items]
Oil and gas sales		$ (4,234)	$ (3,954)	$ 1,354						$ (6,834)
Total Revenues		(4,234)	(3,954)	1,354						(6,834)
Operating income (loss)		(4,234)	(3,954)	1,354						(6,834)
Other income (expenses):
Realized gain (loss) from derivatives		3,293	2,719	(1,354)						4,658
Unrealized gain (loss) from derivatives		(11,112)	34,797	(10,187)						13,498
Other income			(262)	262
Total other income (expenses)		(7,819)	37,254	(11,279)						18,156
Income (loss) before income taxes		(12,053)	33,300	(9,925)						11,322
Benefit from (provision for) income taxes		7,592	(15,831)	4,441						(3,798)
Net income (loss)		$ (4,461)	$ 17,469	$ (5,484)					11,985	$ 7,524
Net income (loss) per share:
Basic		$ (0.10)	$ 0.37	$ (0.11)						$ 0.16
Diluted		$ (0.10)	$ 0.37	$ (0.11)						$ 0.16
As Restated [Member]
Restated Results Of Operations [Line Items]
Oil and gas sales		$ 112,895	$ 100,736	$ 111,689						$ 325,320
Gain on sale of oil and gas properties		(2,794)	20,338	6,727						24,271
Total Revenues		110,101	121,074	118,416						349,591
Total operating expenses		134,520	129,120	115,575						379,215
Operating income (loss)		(24,419)	(8,046)	2,841						(29,624)
Other income (expenses):
Gain on sale of marketable securities				26,621						26,621
Realized gain (loss) from derivatives		3,293	2,719	(1,354)						4,658
Unrealized gain (loss) from derivatives		(11,112)	34,797	(10,187)						13,498
Other income		153	283	239						675
Interest expense		(17,535)	(14,529)	(13,237)						(45,301)
Total other income (expenses)		(25,201)	23,270	2,082						151
Income (loss) before income taxes		(49,620)	15,224	4,923						(29,473)
Benefit from (provision for) income taxes		19,171	(8,059)	(3,548)						7,564
Net income (loss)		$ (30,449)	$ 7,165	$ 1,375					$ 8,540	$ (21,909)
Net income (loss) per share:
Basic		$ (0.66)	$ 0.15	$ 0.03						$ (0.47)
Diluted		$ (0.66)	$ 0.15	$ 0.03						$ (0.47)
Weighted average shares outstanding:
Basic		46,443	46,426	46,372						46,414
Diluted		46,443	46,426	46,372						46,414

Supplementary Quarterly Financial Data (Unaudited) - Consolidated Statements of Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2012	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net loss	$ (78,151)				$ (41,134)	$ 1,309	$ 3,949	$ 2,404			$ (100,060)	$ (33,472)	$ (19,586)
Unrealized hedging gains, net of provision for (benefit from) income taxes of $3,578, ($3,578), $-, ($12,087), $12,087, $-, $3,889, ($3,889), $- and ($4,620), $4,620, $-											(298)	298
Net change in unrealized gains and losses on marketable securities, net of benefit from (provision for) income taxes of $6,793, $-, $6,793, $682, $-, $682, $46, $-, $46 and $7,520, $-, $7,520											(15,760)	(12,152)	1,711
Other comprehensive income (loss)											(16,058)	(11,854)	1,711
Comprehensive income (loss)											$ (116,118)	$ (45,326)	$ (17,875)
As Reported [Member]
Net loss		$ (25,988)	$ (10,304)	$ 6,859					$ (3,445)	$ (29,433)
Unrealized hedging gains, net of provision for (benefit from) income taxes of $3,578, ($3,578), $-, ($12,087), $12,087, $-, $3,889, ($3,889), $- and ($4,620), $4,620, $-		(7,223)	22,448	(6,645)						8,580
Net change in unrealized gains and losses on marketable securities, net of benefit from (provision for) income taxes of $6,793, $-, $6,793, $682, $-, $682, $46, $-, $46 and $7,520, $-, $7,520		(86)	(1,268)	(12,612)						(13,966)
Other comprehensive income (loss)		(7,309)	21,180	(19,257)						(5,386)
Comprehensive income (loss)		(33,297)	10,876	(12,398)						(34,819)
Adjustments [Member]
Net loss		(4,461)	17,469	(5,484)					11,985	7,524
Reclassified to earnings, net of provision for (benefit from) income taxes of $-, $161, $161, $-, $-, $-, $-, $-, $- and $-, $161, $161				(298)						(298)
Unrealized hedging gains, net of provision for (benefit from) income taxes of $3,578, ($3,578), $-, ($12,087), $12,087, $-, $3,889, ($3,889), $- and ($4,620), $4,620, $-		7,223	(22,448)	6,645						(8,580)
Other comprehensive income (loss)		7,223	(22,448)	6,347						(8,878)
Comprehensive income (loss)		2,762	(4,979)	863						(1,354)
As Restated [Member]
Net loss		(30,449)	7,165	1,375					$ 8,540	(21,909)
Reclassified to earnings, net of provision for (benefit from) income taxes of $-, $161, $161, $-, $-, $-, $-, $-, $- and $-, $161, $161				(298)						(298)
Net change in unrealized gains and losses on marketable securities, net of benefit from (provision for) income taxes of $6,793, $-, $6,793, $682, $-, $682, $46, $-, $46 and $7,520, $-, $7,520		(86)	(1,268)	(12,612)						(13,966)
Other comprehensive income (loss)		(86)	(1,268)	(12,910)						(14,264)
Comprehensive income (loss)		$ (30,535)	$ 5,897	$ (11,535)						$ (36,173)

- Definition

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

Net of tax amount of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 17, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 24
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Supplementary Quarterly Financial Data (Unaudited) - Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended	12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Unrealized hedging gains, income tax provision (benefit)					$ (161)	$ 161
Net change in unrealized gains and losses on marketable securities, income tax benefit (provision)					$ 8,487	$ 6,543	$ (923)
As Reported [Member]
Unrealized hedging gains, income tax provision (benefit)	$ 3,889	$ (12,087)	$ 3,578	$ (4,620)
Net change in unrealized gains and losses on marketable securities, income tax benefit (provision)	46	682	6,793	7,520
Adjustments [Member]
Reclassified to earnings, provision for (benefit from)income taxes			161	161
Unrealized hedging gains, income tax provision (benefit)	(3,889)	12,087	(3,578)	4,620
As Restated [Member]
Reclassified to earnings, provision for (benefit from)income taxes			161	161
Net change in unrealized gains and losses on marketable securities, income tax benefit (provision)	$ 46	$ 682	$ 6,793	$ 7,520

Supplementary Quarterly Financial Data (Unaudited) - Consolidated Statement of Stockholders' Equity (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2012	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Beginning Balance				$ 1,037,625				$ 1,068,531	$ 1,037,625	$ 1,037,625	$ 1,037,625	$ 1,068,531	$ 1,066,111
Stock-based compensation											13,728	15,032	17,377
Excess income taxes from stock-based compensation											(1,701)	(612)	1,491
Net loss - as restated	$ (78,151)				$ (41,134)	$ 1,309	$ 3,949	2,404			(100,060)	(33,472)	(19,586)
Other comprehensive loss - as restated											(16,058)	(11,854)	1,711
Ending Balance	933,534				1,037,625						933,534	1,037,625	1,068,531
Common Stock [Member]
Beginning Balance				$ 24,063				$ 23,853	$ 24,063	$ 24,063	$ 24,063	$ 23,853	$ 23,552
Beginning Balance, Shares				48,125				47,706	48,125	48,125	48,125	47,706	47,104
Stock-based compensation											$ 141	$ 210	$ 209
Stock-based compensation, Shares											284	419	418
Ending Balance	$ 24,204				$ 24,063						$ 24,204	$ 24,063	$ 23,853
Ending Balance, shares	48,409				48,125						48,409	48,125	47,706
Additional Paid-in Capital [Member]
Beginning Balance				$ 468,709				$ 454,499	$ 468,709	$ 468,709	$ 468,709	$ 454,499	$ 434,505
Stock-based compensation											13,587	14,822	17,168
Excess income taxes from stock-based compensation											(1,701)	(612)	1,491
Ending Balance	$ 480,595				$ 468,709						480,595	468,709	454,499
Retained Earnings [Member]
Beginning Balance				524,377				557,849	524,377	524,377	524,377	557,849	577,435
Net loss - as restated											(100,060)	(33,472)	(19,586)
Ending Balance	424,317				524,377						424,317	524,377	557,849
Accumulated Other Comprehensive Income [Member]
Beginning Balance				20,476				$ 32,330	20,476	20,476	20,476	32,330	30,619
Other comprehensive loss - as restated											(16,058)	(11,854)	1,711
Ending Balance	4,418				20,476						4,418	20,476	$ 32,330
As Restated [Member]
Beginning Balance	1,009,960	$ 1,037,177	$ 1,028,220	1,037,625					1,037,625	1,037,625	1,037,625
Stock-based compensation										10,189
Excess income taxes from stock-based compensation										(1,681)
Net loss - as restated		(30,449)	7,165	1,375					8,540	(21,909)
Other comprehensive loss - as restated		(86)	(1,268)	(12,910)						(14,264)
Ending Balance		1,009,960	$ 1,037,177	1,028,220	1,037,625				1,037,177	1,009,960		1,037,625
As Restated [Member] \| Common Stock [Member]
Beginning Balance	$ 24,081			$ 24,063					$ 24,063	$ 24,063	$ 24,063
Beginning Balance, Shares	48,162			48,125					48,125	48,125	48,125
Stock-based compensation										$ 18
Stock-based compensation, Shares										37
Ending Balance		$ 24,081			$ 24,063					$ 24,081		$ 24,063
Ending Balance, shares		48,162			48,125					48,162		48,125
As Restated [Member] \| Additional Paid-in Capital [Member]
Beginning Balance	$ 477,199			$ 468,709					$ 468,709	$ 468,709	$ 468,709
Stock-based compensation										10,171
Excess income taxes from stock-based compensation										(1,681)
Ending Balance		$ 477,199			$ 468,709					477,199		$ 468,709
As Restated [Member] \| Retained Earnings [Member]
Beginning Balance	502,468			524,377					524,377	524,377	524,377
Net loss - as restated										(21,909)
Ending Balance		502,468			524,377					502,468		524,377
As Restated [Member] \| Accumulated Other Comprehensive Income [Member]
Beginning Balance	$ 6,212			$ 20,476					$ 20,476	20,476	$ 20,476
Other comprehensive loss - as restated										(14,264)
Ending Balance		$ 6,212			$ 20,476					$ 6,212		$ 20,476

Supplementary Quarterly Financial Data (Unaudited) - Consolidated Statements of Cash Flows (Detail) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2012	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income ( loss)	$ (78,151)				$ (41,134)	$ 1,309	$ 3,949	$ 2,404			$ (100,060)	$ (33,472)	$ (19,586)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Gain on sale of assets											(50,892)	(35,061)	10,103
Deferred income taxes											(47,192)	(14,652)	(4,617)
Dry hole costs and leasehold impairments											61,300	9,819
Impairment of oil and gas properties											25,368	60,817	224
Depreciation, depletion and amortization											365,286	290,776	213,809
Debt issuance cost and discount amortization											5,277	4,300	2,436
Stock-based compensation											13,728	15,032	17,377
Excess income taxes from stock-based compensation											1,701	612	(1,491)
Decrease in accounts receivable											11,975	(9,046)	(4,432)
Increase in other current assets											(4,309)	3,311	48,070
Increase in accounts payable and accrued expenses											(8,463)	(7,532)	49,769
Net cash provided by operating activities											262,229	284,904	311,662
CASH FLOWS FROM INVESTING ACTIVITIES:
Net cash used for investing activities											(383,720)	(952,086)	(440,473)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net cash provided by financing activities											117,502	673,910	40,071
Net decrease in cash and cash equivalents											(3,989)	6,728	(88,740)
Cash and cash equivalents, beginning of the year				$ 8,460				$ 1,732	$ 8,460	$ 8,460	8,460	1,732	90,472
Cash and cash equivalents, end of the year	4,471				8,460						4,471	8,460	$ 1,732
As Reported [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income ( loss)		$ (25,988)	$ (10,304)	6,859					(3,445)	(29,433)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Gain on sale of assets				(33,348)					(53,686)	(50,892)
Deferred income taxes				8,072					416	(11,151)
Dry hole costs and leasehold impairments				1,315					1,315	2,685
Impairment of oil and gas properties				49					5,350	5,350
Depreciation, depletion and amortization				79,097					169,180	268,410
Unrealized gains from derivatives				262
Debt issuance cost and discount amortization				944					2,103	3,689
Stock-based compensation				3,535					6,860	10,189
Excess income taxes from stock-based compensation				1,405					1,670	1,681
Decrease in accounts receivable				1,815					11,611	1,826
Increase in other current assets				(199)					(4,097)	(5,059)
Increase in accounts payable and accrued expenses				63,374					4,621	28,403
Net cash provided by operating activities				133,180					141,898	225,698
CASH FLOWS FROM INVESTING ACTIVITIES:
Net cash used for investing activities				(146,423)					(164,560)	(264,119)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net cash provided by financing activities				8,533					17,707	32,530
Net decrease in cash and cash equivalents				(4,710)					(4,955)	(5,891)
Cash and cash equivalents, beginning of the year	2,569	3,505	3,750	8,460					8,460	8,460	8,460
Cash and cash equivalents, end of the year		2,569	3,505	3,750	8,460				3,505	2,569		8,460
Adjustments [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income ( loss)		(4,461)	17,469	(5,484)					11,985	7,524
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Gain on sale of assets
Deferred income taxes				(4,441)					11,390	3,798
Dry hole costs and leasehold impairments
Impairment of oil and gas properties				0
Depreciation, depletion and amortization
Unrealized gains from derivatives				9,925					(24,610)	(13,498)
Debt issuance cost and discount amortization
Stock-based compensation
Excess income taxes from stock-based compensation
Decrease in accounts receivable									1,235	2,176
Increase in other current assets
Increase in accounts payable and accrued expenses
Net cash provided by operating activities
CASH FLOWS FROM INVESTING ACTIVITIES:
Net cash used for investing activities
CASH FLOWS FROM FINANCING ACTIVITIES:
Net cash provided by financing activities
Net decrease in cash and cash equivalents
Cash and cash equivalents, beginning of the year
Cash and cash equivalents, end of the year
As Restated [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income ( loss)		(30,449)	7,165	1,375					8,540	(21,909)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Gain on sale of assets				(33,348)					(53,686)	(50,892)
Deferred income taxes				3,631					11,806	(7,353)
Dry hole costs and leasehold impairments				1,315					1,315	2,685
Impairment of oil and gas properties				49					5,350	5,350
Depreciation, depletion and amortization				79,097					169,180	268,410
Unrealized gains from derivatives				10,187					(24,610)	(13,498)
Debt issuance cost and discount amortization				944					2,103	3,689
Stock-based compensation				3,535					6,860	10,189
Excess income taxes from stock-based compensation				1,405					1,670	1,681
Decrease in accounts receivable				1,815					12,846	4,002
Increase in other current assets				(199)					(4,097)	(5,059)
Increase in accounts payable and accrued expenses				63,374					4,621	28,403
Net cash provided by operating activities				133,180					141,898	225,698
CASH FLOWS FROM INVESTING ACTIVITIES:
Net cash used for investing activities				(146,423)					(164,560)	(264,119)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net cash provided by financing activities				8,533					17,707	32,530
Net decrease in cash and cash equivalents				(4,710)					(4,955)	(5,891)
Cash and cash equivalents, beginning of the year	$ 2,569	3,505	3,750	8,460					8,460	8,460	$ 8,460
Cash and cash equivalents, end of the year		$ 2,569	$ 3,505	$ 3,750	$ 8,460				$ 3,505	$ 2,569		$ 8,460

Oil and Gas Reserves Information (Unaudited) - Summary of Changes in Net Quantities of Crude Oil and Natural Gas Reserves (Detail)	12 Months Ended
	Dec. 31, 2012 MBbls MMcf	Dec. 31, 2011 MBbls MMcf	Dec. 31, 2010 MBbls MMcf
Oil (MBbls) [Member]
Proved Reserves:
Beginning of year \| MBbls	32,099	4,219	7,214
Revisions of previous estimates \| MBbls	(397)	8	351
Extensions and discoveries \| MBbls	17,312	9,845	1,484
Purchases of minerals in place \| MBbls		18,865
Disposals of minerals in place \| MBbls	(7,486)		(4,115)
Production \| MBbls	(2,309)	(838)	(715)
End of year \| MBbls	39,219	32,099	4,219
Proved Developed Reserves:
Beginning of year \| MBbls	8,405	2,961	4,894
End of year \| MBbls	12,308	8,405	2,961
Natural Gas (MMcf) [Member]
Proved Reserves:
Beginning of year \| MMcf	1,118,632	1,025,633	682,389
Revisions of previous estimates \| MMcf	(531,335)	(36,150)	(6,137)
Extensions and discoveries \| MMcf	31,050	169,188	421,657
Purchases of minerals in place \| MMcf		50,554
Disposals of minerals in place \| MMcf	(59,257)		(3,303)
Production \| MMcf	(82,490)	(90,593)	(68,973)
End of year \| MMcf	476,600	1,118,632	1,025,633
Proved Developed Reserves:
Beginning of year \| MMcf	550,474	506,809	367,102
End of year \| MMcf	368,775	550,474	506,809

Oil and Gas Reserves Information (Unaudited) - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2012 $ / bbl $ / Mcf MMcf	Dec. 31, 2011 $ / bbl $ / Mcf
Average Sales Price and Production Costs Per Unit of Production [Line Items]
Annual Change in Total Proved Undeveloped Natural Gas Reserves \| MMcf	(460,000)
Crude Oil and NGL Per Barrel [Member]
Average Sales Price and Production Costs Per Unit of Production [Line Items]
Average sales prices \| $ / bbl	94.61	92.93
Natural Gas Per Thousand Cubic Feet [Member]
Average Sales Price and Production Costs Per Unit of Production [Line Items]
Average sales prices \| $ / Mcf	2.84	4.18

Oil and Gas Reserves Information (Unaudited) - Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Reserves (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Cash Flows Relating to Proved Reserves:
Future Cash Flows	$ 5,064,519	$ 7,656,654
Future Costs:
Production	(1,585,309)	(2,259,147)
Development and Abandonment	(1,165,991)	(2,174,656)
Future Income Taxes	(552,843)	(843,266)
Future Net Cash Flows	1,760,376	2,379,585
10% Discount Factor	(976,159)	(1,266,090)
Standardized Measure of Discounted Future Net Cash Flows	$ 784,217	$ 1,113,495

Oil and Gas Reserves Information (Unaudited) - Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Reserves (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Reserve Quantities [Line Items]
Percentage of discount factor	10.00%	10.00%

Oil and Gas Reserves Information (Unaudited) - Changes in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Reserves (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reserve Quantities [Line Items]
Standardized Measure, Beginning of Year	$ 1,113,495	$ 606,136	$ 426,590
Net change in sales price, net of production costs	(428,469)	1,061	141,570
Development costs incurred during the year which were previously estimated	211,020	205,418	69,216
Revisions of quantity estimates	(892,645)	(50,398)	(5,433)
Accretion of discount	148,697	79,763	48,911
Changes in future development and abandonment costs	653,824	10,151	(15,201)
Changes in timing and other	(16,176)	(58,049)	66,657
Extensions and discoveries	467,080	540,937	321,909
Purchases of minerals in place		316,118
Sales of minerals in place	(261,971)		(50,651)
Sales, net of production costs	(341,803)	(355,654)	(268,466)
Net changes in income taxes	131,165	(181,988)	(128,966)
Standardized Measure, End of Year	$ 784,217	$ 1,113,495	$ 606,136