Stone Energy (SGY) 10-Q 6 Aug 14 2014 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Jun. 30, 2014	Aug. 05, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Jun-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q2	'
Trading Symbol	'SGY	'
Entity Registrant Name	'STONE ENERGY CORP	'
Entity Central Index Key	'0000904080	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	56,181,661

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEET (USD $)	Jun. 30, 2014		Mar. 31, 2014	Dec. 31, 2013		Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets:	'		'	'		'	'	'
Cash and cash equivalents	$333,886		'	$331,224		$226,372	'	$279,526
Accounts receivable	197,495		'	171,971		'	'	'
Fair value of derivative contracts	'		'	4,549		'	'	'
Current income tax receivable	7,372		'	7,366		'	'	'
Deferred taxes	36,308	[1]	'	31,710	[1]	'	'	'
Inventory	3,723		'	3,723		'	'	'
Other current assets	1,955		'	1,874		'	'	'
Total current assets	580,739		'	552,417		'	'	'
Oil and gas properties, full cost method of accounting:	'		'	'		'	'	'
Proved	8,520,195		'	7,804,117		'	'	'
Less: accumulated depreciation, depletion and amortization	-6,144,815		'	-5,908,760		'	'	'
Net proved oil and gas properties	2,375,380		'	1,895,357		'	'	'
Unevaluated	554,201		'	724,339		'	'	'
Other property and equipment, net	28,302		'	26,178		'	'	'
Fair value of derivative contracts	415		'	1,378		'	'	'
Other assets, net	43,015		'	48,887		'	'	'
Total assets	3,582,052		'	3,248,556		'	'	'
Current liabilities:	'		'	'		'	'	'
Accounts payable to vendors	193,900		'	195,677		'	'	'
Undistributed oil and gas proceeds	62,927		'	37,029		'	'	'
Accrued interest	9,025		'	9,022		'	'	'
Fair value of derivative contracts	25,711		'	7,753		'	'	'
Asset retirement obligations	77,132		'	67,161		'	'	'
Other current liabilities	79,539		'	54,520		'	'	'
Total current liabilities	448,234		'	371,162		'	'	'
Long-term debt	1,033,931		'	1,027,084		'	'	'
Deferred taxes	404,188	[1]	'	390,693	[1]	'	'	'
Asset retirement obligations	431,060		'	435,352		'	'	'
Fair value of derivative contracts	5,251		'	470		'	'	'
Other long-term liabilities	47,843		'	53,509		'	'	'
Total liabilities	2,370,507		'	2,278,270		'	'	'
Commitments and contingencies	'		'	'		'	'	'
Stockholders' equity:	'		'	'		'	'	'
Common stock, $.01 par value; authorized 100,000,000 shares; issued 54,872,749 and 48,750,533 shares, respectively	549		'	488		'	'	'
Treasury stock (16,582 shares, at cost)	-860		'	-860		'	'	'
Additional paid-in capital	1,624,795		'	1,397,885		'	'	'
Accumulated deficit	-394,778		'	-425,165		'	'	'
Accumulated other comprehensive income (loss)	-18,161		-9,200	-2,062		24,500	10,500	28,800
Total stockholders' equity	1,211,545		'	970,286		'	'	'
Total liabilities and stockholders' equity	$3,582,052		'	$3,248,556		'	'	'
[1]	Deferred income taxes have been allocated to the Guarantor Subsidiary where related oil and gas properties reside.

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEET (Parenthetical) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Statement Of Financial Position [Abstract]	'	'
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	54,872,749	48,750,533
Treasury stock, shares	16,582	16,582

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENT OF INCOME (Unaudited) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Operating revenue:	'	'	'	'
Oil production	$142,393	$184,498	$280,682	$371,423
Gas production	46,667	47,832	103,029	84,654
Natural gas liquids production	15,936	11,200	43,906	20,378
Other operational income	2,050	979	3,047	1,786
Derivative income, net	'	1,368	'	147
Total operating revenue	207,046	245,877	430,664	478,388
Operating expenses:	'	'	'	'
Lease operating expenses	49,454	50,517	96,357	103,561
Transportation, processing and gathering expenses	14,098	8,896	28,724	14,293
Production taxes	3,257	4,091	6,319	6,180
Depreciation, depletion and amortization	92,835	87,209	175,481	162,644
Accretion expense	7,733	8,318	15,288	16,581
Salaries, general and administrative expenses	16,637	15,198	32,966	29,150
Incentive compensation expense	3,903	2,050	7,037	3,481
Other operational expenses	'	73	212	145
Derivative expense, net	2,516	'	3,115	'
Total operating expenses	190,433	176,352	365,499	336,035
Income from operations	16,613	69,525	65,165	142,353
Other (income) expenses:	'	'	'	'
Interest expense	9,913	8,895	18,270	18,530
Interest income	-193	-115	-336	-232
Other income	-722	-682	-1,429	-1,408
Other expense	179	'	179	'
Total other (income) expenses	9,177	8,098	16,684	16,890
Income before income taxes	7,436	61,427	48,481	125,463
Provision (benefit) for income taxes:	'	'	'	'
Current	'	-6,993	'	-10,739
Deferred	2,992	29,398	18,094	56,422
Total income taxes	2,992	22,405	18,094	45,683
Net income	$4,444	$39,022	$30,387	$79,780
Basic earnings per share	$0.08	$0.78	$0.59	$1.60
Diluted earnings per share	$0.08	$0.78	$0.59	$1.60
Average shares outstanding	52,050	48,687	50,540	48,653
Average shares outstanding assuming dilution	52,373	48,725	50,727	48,691

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Unaudited) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement Of Income And Comprehensive Income [Abstract]	'	'	'	'
Net income	$4,444	$39,022	$30,387	$79,780
Other comprehensive income (loss), net of tax effect:	'	'	'	'
Derivatives	-9,765	14,561	-16,355	-3,780
Foreign currency translation	755	-523	256	-523
Comprehensive income (loss)	($4,566)	$53,060	$14,288	$75,477

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (Unaudited) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:	'	'
Net income	$30,387	$79,780
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation, depletion and amortization	175,481	162,644
Accretion expense	15,288	16,581
Deferred income tax provision	18,094	56,422
Settlement of asset retirement obligations	-24,915	-37,335
Non-cash stock compensation expense	5,358	4,866
Excess tax benefits	'	-104
Non-cash derivative expense	2,697	311
Non-cash interest expense	8,229	8,181
Change in current income taxes	-6	-16,399
(Increase) decrease in accounts receivable	-25,524	1,138
Increase in other current assets	-82	-245
Decrease in inventory	'	158
Increase in accounts payable	1,843	6,593
Increase (decrease) in other current liabilities	50,785	-3,170
Other	-675	-3,448
Net cash (used in) provided by operating activities	256,960	275,973
Cash flows from investing activities:	'	'
Investment in oil and gas properties	-517,904	-320,218
Proceeds from sale of oil and gas properties, net of expenses	51,955	'
Investment in fixed and other assets	-3,896	-1,711
Change in restricted funds	-356	-3,515
Net cash used in investing activities	-470,201	-325,444
Cash flows from financing activities:	'	'
Net proceeds from issuance of common stock	226,036	'
Deferred financing costs	-3,167	-11
Excess tax benefits	'	104
Net payments for share-based compensation	-6,948	-3,590
Net cash provided by (used in) financing activities	215,921	-3,497
Effect of exchange rate changes on cash	-18	-186
Net change in cash and cash equivalents	2,662	-53,154
Cash and cash equivalents, beginning of period	331,224	279,526
Cash and cash equivalents, end of period	$333,886	$226,372

Interim_Financial_Statements

Interim Financial Statements	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Interim Financial Statements	'
	Note 1 – Interim Financial Statements
	The condensed consolidated financial statements of Stone Energy Corporation (“Stone”) and its subsidiaries as of June 30, 2014 and for the three and six month periods ended June 30, 2014 and 2013 are unaudited and reflect all adjustments (consisting only of normal recurring adjustments), which are, in the opinion of management, necessary for a fair presentation of the financial position and operating results for the interim periods. The condensed consolidated balance sheet as of December 31, 2013 has been derived from the audited financial statements as of that date contained in our Annual Report on Form 10-K for the year ended December 31, 2013 (our “2013 Annual Report on Form 10-K”). The condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto, together with management’s discussion and analysis of financial condition and results of operations, contained in our 2013 Annual Report on Form 10-K. The results of operations for the three and six month periods ended June 30, 2014 are not necessarily indicative of future financial results.

Earnings_Per_Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	Note 2 – Earnings Per Share
	The following table sets forth the calculation of basic and diluted weighted average shares outstanding and earnings per share for the indicated periods:
		Three Months Ended						Six Months Ended
		June 30,						June 30,
		2014			2013			2014			2013
		(In thousands, except per share data)
	Income (numerator):
	Basic:
	Net income	$	4,444		$	39,022		$	30,387		$	79,780
	Net income attributable to participating securities		(111	)		(1,015	)		(698	)		(1,794	)
	Net income attributable to common stock - basic	$	4,333		$	38,007		$	29,689		$	77,986
	Diluted:
	Net income	$	4,444		$	39,022		$	30,387		$	79,780
	Net income attributable to participating securities		(111	)		(1,015	)		(697	)		(1,793	)
	Net income attributable to common stock - diluted	$	4,333		$	38,007		$	29,690		$	77,987
	Weighted average shares (denominator):
	Weighted average shares - basic		52,050			48,687			50,540			48,653
	Dilutive effect of stock options		58			38			54			38
	Dilutive effect of convertible notes		265			—			133			—
	Weighted average shares - diluted		52,373			48,725			50,727			48,691
	Basic earnings per share	$	0.08		$	0.78		$	0.59		$	1.6
	Diluted earnings per share	$	0.08		$	0.78		$	0.59		$	1.6
	Stock options that were considered antidilutive because the exercise price of the options exceeded the average price of our common stock for the applicable period totaled approximately 120,000 shares and 131,000 shares during the three and six months ended June 30, 2014, respectively, and 333,000 shares during the three and six months ended June 30, 2013.
	During the three months ended June 30, 2014 and 2013, approximately 40,000 shares and 45,000 shares of our common stock, respectively, were issued from authorized shares upon the lapsing of forfeiture restrictions of restricted stock and the exercise of stock options by employees and nonemployee directors. During the six months ended June 30, 2014 and 2013, approximately 372,000 shares and 336,000 shares of common stock, respectively, were issued from authorized shares upon the lapsing of forfeiture restrictions of restricted stock and the exercise of stock options by employees and nonemployee directors. In May 2014, 5,750,000 shares of our common stock were issued in a public offering (see Note 3 – Common Stock Offering).
	Because it is management’s stated intention to redeem the principal amount of our 1 3⁄4% Senior Convertible Notes due 2017 (the “2017 Convertible Notes”) (see Note 5 – Long-Term Debt) in cash, we have used the treasury method for determining dilution in the diluted earnings per share computation. During the three months ended June 30, 2014, the average price of our common stock exceeded the effective conversion price of the 2017 Convertible Notes, and therefore, such notes were dilutive for the three and six months ended June 30, 2014. For the prior year periods presented, the average price of our common stock was less than the effective conversion price for such notes, resulting in no dilutive effect on the diluted earnings per share computation for such periods. For all periods presented, the average price of our common stock was less than the strike price of the Sold Warrants (as defined in Note 5 – Long-Term Debt) and therefore, such warrants were not dilutive for such periods. Based on the terms of the Purchased Call Options (as defined in Note 5 – Long-Term Debt), such call options are antidilutive and therefore, were not included in the calculation of diluted earnings per share.

Common_Stock_Offering

Common Stock Offering	6 Months Ended
	Jun. 30, 2014
Text Block [Abstract]	'
Common Stock Offering	'
	Note 3 – Common Stock Offering
	In May 2014, we sold 5,750,000 shares of our common stock in a public offering at a price of $41.00 per share resulting in net proceeds of approximately $226.0 million after deducting the underwriting discount and offering expenses.

Derivative_Instruments_and_Hed

Derivative Instruments and Hedging Activities	6 Months Ended
	Jun. 30, 2014
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Derivative Instruments and Hedging Activities	'
	Note 4 – Derivative Instruments and Hedging Activities
	Our hedging strategy is designed to protect our near and intermediate term cash flows from future declines in oil and natural gas prices. This protection is essential to capital budget planning, which is sensitive to expenditures that must be committed to in advance, such as rig contracts and the purchase of tubular goods. We enter into derivative transactions to secure a commodity price for a portion of future production that is acceptable at the time of the transaction. These derivatives generally are designated as cash flow hedges upon entering into the contracts. We do not enter into derivative transactions for trading purposes. We have no fair value hedges.
	The nature of a derivative instrument must be evaluated to determine if it qualifies as a hedging instrument. If the instrument qualifies as a hedging instrument, it is recorded as either an asset or liability measured at fair value and subsequent changes in the derivative’s fair value are recognized in stockholders’ equity through other comprehensive income (loss), net of related taxes, to the extent the hedge is considered effective. Monthly settlements of effective hedges are reflected in revenue from oil and gas production and cash flows from operating activities. Instruments not qualifying as hedging instruments are recorded in our balance sheet at fair value, and changes in fair value are recognized in earnings through derivative expense (income). Monthly settlements of ineffective hedges and derivative instruments not qualifying as hedging instruments are recognized in earnings through derivative expense (income) and cash flows from operating activities.
	We have entered into fixed-price swaps with various counterparties for a portion of our expected 2014, 2015 and 2016 oil and natural gas production from the Gulf Coast Basin. Some of our fixed-price oil swap settlements are based on an average of the New York Mercantile Exchange (“NYMEX”) closing price for West Texas Intermediate crude oil during the entire calendar month, and some are based on the average of the Intercontinental Exchange closing price for Brent crude oil during the entire calendar month. Our fixed-price gas swap settlements are based on the NYMEX price for the last day of a respective contract month. Swaps typically provide for monthly payments by us if prices rise above the swap price or monthly payments to us if prices fall below the swap price. Our fixed-price swap contracts are with The Toronto-Dominion Bank, Barclays Bank PLC, BNP Paribas, The Bank of Nova Scotia, Bank of America, Natixis and Regions Bank.
	The following table illustrates our derivative positions for calendar years 2014, 2015 and 2016 as of August 5, 2014:
			Fixed-Price Swaps (NYMEX, except where noted)
			Natural Gas							Oil
			Daily Volume				Swap Price			Daily Volume				Swap Price
			(MMBtus/d)				($)			(Bbls/d)				($)
	2014			10,000				4			1,000				90.06
	2014			10,000				4.04			1,000	(a)			90.25
	2014			10,000				4.105			1,000				92.25
	2014			10,000				4.19			1,000				93.55
	2014			10,000	(b)			4.25			1,000				94
	2014			10,000				4.25			1,000				98
	2014			10,000				4.35			1,000				98.3
	2014										2,000	(c)			98.85
	2014										1,000				99.65
	2014										1,000	(d)			103.3
	2015			10,000				4.005			1,000				89
	2015			10,000				4.12			1,000				90
	2015			10,000				4.15			1,000				90.25
	2015			10,000				4.165			1,000				90.4
	2015			10,000				4.22			1,000				93.28
	2015			10,000				4.255			1,000				93.37
	2015										1,000				94.85
	2015										1,000				95
	2016			10,000				4.11
	2016			10,000				4.12
	(a)	October through December
	(b)	February through December
	(c)	January through June
	(d)	Brent crude oil contract
	All of our derivative instruments at December 31, 2013 were designated as effective cash flow hedges. At June 30, 2014, certain of our natural gas derivative instruments no longer qualified as cash flow hedges as it was no longer probable, subsequent to the sale of our non-core Gulf of Mexico (“GOM”) conventional shelf properties (see Note 13 – Subsequent Events), that GOM natural gas production would be sufficient to cover the GOM volumes hedged. Accordingly, we discontinued hedge accounting for such contracts as of June 30, 2014 and recognized the related accumulated other comprehensive loss of $1.5 million as derivative expense in the second quarter of 2014. Contracts no longer qualifying as cash flow hedges were comprised of three natural gas contracts for the months of August through December 2014 and two natural gas contracts for the months of January through December 2015. Additionally, a small portion of our cash flow hedges are typically determined to be ineffective because oil and natural gas price changes in the markets in which we sell our products are not 100% correlative to changes in the underlying price basis indicative in the derivative contract. At June 30, 2014, we had an accumulated other comprehensive loss of $17.8 million, net of tax, related to the fair value of our effective cash flow hedges that were outstanding as of June 30, 2014. We believe that approximately $14.8 million, net of tax, of accumulated other comprehensive loss will be reclassified into earnings in the next 12 months.
	Derivatives qualifying as hedging instruments:
	The following tables disclose the location and fair value amounts of derivatives qualifying as hedging instruments, as reported in our balance sheet, at June 30, 2014 and December 31, 2013:
	Fair Value of Derivatives Qualifying as Hedging Instruments at June 30, 2014
	(In millions)
			Asset Derivatives						Liability Derivatives
	Description		Balance Sheet Location		Fair				Balance Sheet Location	Fair
					Value					Value
	Commodity contracts		Current assets: Fair value of derivative contracts		$	—			Current liabilities: Fair value of derivative contracts	$	24.2
			Long-term assets: Fair value of derivative contracts			0.4			Long-term liabilities: Fair value of derivative contracts		5.3
					$	0.4				$	29.5
	Fair Value of Derivatives Qualifying as Hedging Instruments at December 31, 2013
	(In millions)
			Asset Derivatives						Liability Derivatives
	Description		Balance Sheet Location		Fair				Balance Sheet Location	Fair
					Value					Value
	Commodity contracts		Current assets: Fair value of derivative contracts		$	4.5			Current liabilities: Fair value of derivative contracts	$	7.8
			Long-term assets: Fair value of derivative contracts			1.4			Long-term liabilities: Fair value of derivative contracts		0.5
					$	5.9				$	8.3
	The following tables disclose the before tax effect of derivatives qualifying as hedging instruments, as reported in the statement of income, for the three and six month periods ended June 30, 2014 and 2013:
	Effect of Derivatives Qualifying as Hedging Instruments on the Statement of Income
	for the Three Months Ended June 30, 2014 and 2013
	(In millions)
	Derivatives in Cash		Amount of Gain							Gain (Loss) Reclassified from								Gain (Loss) Recognized in Income
			(Loss) Recognized
	Flow Hedging		in Other							Accumulated Other Comprehensive								on Derivatives
			Comprehensive
	Relationships		Income on							Income into Income								(Ineffective Portion)
			Derivatives
										(Effective Portion) (a)
		2014				2013			Location		2014				2013		Location	2014			2013
Commodity contracts		($	26	)		$	30		Operating revenue - oil/gas production		($	9.2	)		$	7.3	Derivative (expense) income, net	($	1	)	$	1.4
Total		($	26	)		$	30				($	9.2	)		$	7.3		($	1	)	$	1.4
(a)    For the three months ended June 30, 2014, effective hedging contracts decreased oil revenue by $6.1 million and decreased gas revenue by $3.1 million. For the three months ended June 30, 2013, effective hedging contracts increased oil revenue by $5.3 million and increased gas revenue by $2.0 million.
Effect of Derivatives Qualifying as Hedging Instruments on the Statement of Income
for the Six Months Ended June 30, 2014 and 2013
(In millions)
Derivatives in Cash		Amount of Gain							Gain (Loss) Reclassified from								Gain (Loss) Recognized in Income
		(Loss) Recognized
Flow Hedging		in Other							Accumulated Other Comprehensive								on Derivatives
		Comprehensive
Relationships		Income on							Income into Income								(Ineffective Portion)
		Derivatives
									(Effective Portion) (a)
		2014				2013			Location		2014				2013		Location	2014			2013
Commodity contracts		($	43.4	)		$	9.9		Operating revenue - oil/gas production		($	16.3	)		$	15.9	Derivative (expense) income, net	($	1.6	)	$	0.1
Total		($	43.4	)		$	9.9				($	16.3	)		$	15.9		($	1.6	)	$	0.1
(a)	For the six months ended June 30, 2014, effective hedging contracts decreased oil revenue by $8.6 million and decreased gas revenue by $7.7 million. For the six months ended June 30, 2013, effective hedging contracts increased oil revenue by $9.9 million and increased gas revenue by $6.0 million.
Derivatives not qualifying as hedging instruments:
The following table discloses the location and fair value amounts of our derivatives not qualifying as hedging instruments, as reported in our balance sheet, at June 30, 2014. All of our derivatives at December 31, 2013 qualified as hedging instruments.
Fair Value of Derivatives Not Qualifying as Hedging Instruments at June 30, 2014
(In millions)
Description		Balance Sheet Location		Fair Value
Commodity contracts		Current liabilities: Fair value of derivative contracts		$	1.5
Gains or losses related to changes in fair value and cash settlements for derivatives not qualifying as hedging instruments are recorded as derivative income (expense) in the statement of income. The following table discloses the before tax effect of our derivatives not qualifying as hedging instruments on the statement of income for the three and six month periods ended June 30, 2014:
Amount of Loss Recognized in Derivative Expense
(In millions)
Description		Three Months Ended				Six Months Ended
		June 30, 2014				June 30, 2014
Commodity contracts:
Cash settlements		$	—			$	—
Change in fair value			(1.5	)			(1.5	)
Total losses on non-qualifying hedges		($	1.5	)		($	1.5	)
Offsetting of derivative assets and liabilities:
Our derivative contracts are subject to netting arrangements. It is our policy to not offset our derivative contracts in presenting the fair value of these contracts as assets and liabilities in our balance sheet. The following presents the potential impact of the rights of offset associated with our recognized assets and liabilities at June 30, 2014 (in millions):
		As Presented				Effects of			With Effects of
		Without				Netting			Netting
		Netting
Current assets: Fair value of derivative contracts		$	—			$	—		$	—
Long-term assets: Fair value of derivative contracts			0.4				(0.4	)		—
Current liabilities: Fair value of derivative contracts			(25.7	)			—			(25.7	)
Long-term liabilities: Fair value of derivative contracts			(5.3	)			0.4			(4.9	)

LongTerm_Debt

Long-Term Debt	6 Months Ended
	Jun. 30, 2014
Debt Disclosure [Abstract]	'
Long-Term Debt	'
	Note 5 – Long-Term Debt
	Long-term debt consisted of the following at:
		June 30,		December 31,
		2014		2013
		(In millions)
	1 3⁄4% Senior Convertible Notes due 2017	$	258.9	$	252.1
	7 1⁄2% Senior Notes due 2022		775		775
	Bank debt		—		—
	Total long-term debt	$	1,033.90	$	1,027.10
	Bank Debt. On June 24, 2014, we entered into an amended and restated revolving credit facility with commitments totaling $900 million (subject to borrowing base limitations) through a syndicated bank group, replacing our previous facility. The bank credit facility matures on July 1, 2019. Our initial borrowing base under the bank credit facility has been set at $500 million, an increase from the previous borrowing base of $400 million. As of June 30 and August 5, 2014, we had no outstanding borrowings under the bank credit facility and $21.0 million in letters of credit had been issued pursuant to the bank credit facility, leaving $479.0 million of availability under the bank credit facility. Subject to certain exceptions, the bank credit facility is required to be guaranteed by all of our material domestic direct and indirect subsidiaries. The bank credit facility is guaranteed by our only material subsidiary, Stone Energy Offshore, L.L.C. (“Stone Offshore”).
	The borrowing base under the bank credit facility is redetermined semi-annually, in May and November, by the lenders, taking into consideration the estimated loan value of our oil and gas properties and those of our subsidiaries that guarantee the bank facility in accordance with the lenders’ customary practices for oil and gas loans. In addition, we and the lenders each have discretion at any time, but not more than two additional times in any calendar year, to have the borrowing base redetermined. The bank credit facility is collateralized by substantially all of Stone’s and Stone Offshore’s assets. Stone and Stone Offshore are required to mortgage, and grant a security interest in, their oil and natural gas reserves representing at least 80% of the discounted present value of the future net cash flows from their proved oil and natural gas reserves reviewed in determining the borrowing base.
	Interest on loans under the bank credit facility is calculated using the London Interbank Offering (“LIBOR”) rate or the base rate, at the election of Stone. The margin for loans at the LIBOR rate is determined based on borrowing base utilization and ranges from 1.500% to 2.500%. The bank credit facility provides for optional and mandatory prepayments, affirmative and negative covenants and interest coverage ratio and leverage ratio maintenance covenants. We were in compliance with all covenants as of June 30, 2014.
	2017 Convertible Notes. On March 6, 2012, we issued in a private offering $300 million in aggregate principal amount of the 2017 Convertible Notes to qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended (the “Securities Act”). The 2017 Convertible Notes are convertible into cash, shares of our common stock or a combination of cash and shares of our common stock, at our election, based on an initial conversion rate of 23.4449 shares of our common stock per $1,000 principal amount of 2017 Convertible Notes, which corresponds to an initial conversion price of approximately $42.65 per share of our common stock. On June 30, 2014, our closing share price was $46.79. The conversion rate, and thus the conversion price, may be adjusted under certain circumstances as described in the indenture related to the 2017 Convertible Notes. Upon conversion, we will be obligated to pay or deliver, as the case may be, cash, shares of our common stock or a combination of cash and shares of our common stock, at our election. Prior to December 1, 2016, the 2017 Convertible Notes will be convertible only upon the occurrence of certain events and during certain periods, and thereafter, at any time until the second scheduled trading day immediately preceding the maturity date.
	In connection with the offering, we entered into convertible note hedge transactions with respect to our common stock (the “Purchased Call Options”) with Barclays Capital Inc., acting as agent for Barclays Bank PLC and Bank of America, N.A. (the “Dealers”). We paid an aggregate amount of approximately $70.8 million to the Dealers for the Purchased Call Options. The Purchased Call Options cover, subject to customary antidilution adjustments, approximately 7,033,470 shares of our common stock at a strike price that corresponds to the initial conversion price of the 2017 Convertible Notes, also subject to adjustment, and are exercisable upon conversion of the 2017 Convertible Notes.
	We also entered into separate warrant transactions whereby, in reliance upon the exemption from registration provided by Section 4(2) of the Securities Act, we sold to the Dealers warrants to acquire, subject to customary antidilution adjustments, approximately 7,033,470 shares of our common stock (the “Sold Warrants”) at a strike price of $55.91 per share of our common stock. We received aggregate proceeds of approximately $40.1 million from the sale of the Sold Warrants to the Dealers. If, upon expiration of the Sold Warrants, the price per share of our common stock, as measured under the Sold Warrants, is greater than the strike price of the Sold Warrants, we will be required to issue, without further consideration, under each Sold Warrant a number of shares of our common stock with a value equal to the amount of such difference.
	As of June 30, 2014, the carrying amount of the liability component of the 2017 Convertible Notes was $258.9 million. During the three and six months ended June 30, 2014, we recognized $3.5 million and $6.8 million, respectively, of interest expense for the amortization of the discount and $0.3 million and $0.6 million, respectively, of interest expense for the amortization of deferred financing costs related to the 2017 Convertible Notes. During the three and six months ended June 30, 2014, we recognized $1.3 million and $2.6 million, respectively, of interest expense related to the contractual interest coupon on the 2017 Convertible Notes.

Asset_Retirement_Obligations

Asset Retirement Obligations	6 Months Ended
	Jun. 30, 2014
Asset Retirement Obligation Disclosure [Abstract]	'
Asset Retirement Obligations	'
	Note 6 – Asset Retirement Obligations
	The change in our asset retirement obligations during the six months ended June 30, 2014 is set forth below:
		Six Months
		Ended
		June 30, 2014
		(In millions)
	Asset retirement obligations as of the beginning of the period, including current portion	$	502.5
	Liabilities incurred		25.7
	Liabilities settled		(24.9	)
	Divestment of properties		(10.4	)
	Accretion expense		15.3
	Asset retirement obligations as of the end of the period, including current portion	$	508.2

Divestitures

Divestitures	6 Months Ended
	Jun. 30, 2014
Business Combinations [Abstract]	'
Divestitures	'
	Note 7 – Divestitures
	On January 16, 2014, we completed the sale of our interests in the Cut Off and Clovelly fields for cash consideration of approximately $44.8 million and the assumption of the associated asset retirement obligations of approximately $9.2 million. On January 31, 2014, we completed the sale of our interest in the Hatch Point field for cash consideration of approximately $9.7 million and the assumption of the associated asset retirement obligations of approximately $1.2 million. These sales were accounted for as an adjustment to capitalized costs with no gain or loss recognized.
	On July 31, 2014, we completed the sale of certain of our non-core properties in the GOM conventional shelf (see Note 13—Subsequent Events).

Fair_Value_Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	Note 8 – Fair Value Measurements
	U.S. Generally Accepted Accounting Principles (“GAAP”) establish a fair value hierarchy that has three levels based on the reliability of the inputs used to determine the fair value. These levels include: Level 1, defined as inputs such as unadjusted quoted prices in active markets for identical assets or liabilities; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs for use when little or no market data exists, therefore requiring an entity to develop its own assumptions.
	As of June 30, 2014 and December 31, 2013, we held certain financial assets and liabilities that are required to be measured at fair value on a recurring basis, including our commodity derivative instruments and our investments in marketable securities. We utilize the services of an independent third party to assist us in valuing our derivative instruments. We used the income approach in determining the fair value of our derivative instruments utilizing a proprietary pricing model. The model accounts for our credit risk and the credit risk of our counterparties in the discount rate applied to estimated future cash inflows and outflows. Our swap contracts are included within the Level 2 fair value hierarchy. For a more detailed description of our derivative instruments, see Note 4 – Derivative Instruments and Hedging Activities. We used the market approach in determining the fair value of our investments in marketable securities, which are included within the Level 1 fair value hierarchy.
	The following tables present our assets and liabilities that are measured at fair value on a recurring basis at June 30, 2014:
		Fair Value Measurements at June 30, 2014
	Assets	Total		Quoted Prices		Significant		Significant
				in Active		Other		Unobservable
				Markets for		Observable		Inputs
				Identical Assets		Inputs		(Level 3)
				(Level 1)		(Level 2)
		(In millions)
	Marketable securities (Other Assets)	$	8.7	$	8.7	$	—	$	—
	Derivative contracts		0.4		—		0.4		—
	Total	$	9.1	$	8.7	$	0.4	$	—
		Fair Value Measurements at June 30, 2014
	Liabilities	Total		Quoted Prices		Significant		Significant
				in Active		Other		Unobservable
				Markets for		Observable		Inputs
				Identical		Inputs		(Level 3)
				Liabilities		(Level 2)
				(Level 1)
		(In millions)
	Derivative contracts	$	31	$	—	$	31	$	—
	Total	$	31	$	—	$	31	$	—
	The following tables present our assets and liabilities that are measured at fair value on a recurring basis at December 31, 2013:
		Fair Value Measurements at December 31, 2013
	Assets	Total		Quoted Prices		Significant		Significant
				in Active		Other		Unobservable
				Markets for		Observable		Inputs
				Identical Assets		Inputs		(Level 3)
				(Level 1)		(Level 2)
		(In millions)
	Marketable securities (Other Assets)	$	8.2	$	8.2	$	—	$	—
	Derivative contracts		5.9		—		5.9		—
	Total	$	14.1	$	8.2	$	5.9	$	—
		Fair Value Measurements at December 31, 2013
	Liabilities	Total		Quoted Prices		Significant		Significant
				in Active		Other		Unobservable
				Markets for		Observable		Inputs
				Identical		Inputs		(Level 3)
				Liabilities		(Level 2)
				(Level 1)
		(In millions)
	Derivative contracts	$	8.3	$	—	$	8.3	$	—
	Total	$	8.3	$	—	$	8.3	$	—
	The fair value of cash and cash equivalents and our variable-rate bank debt approximated book value at June 30, 2014 and December 31, 2013. As of June 30, 2014 and December 31, 2013, the fair value of the liability component of the 2017 Convertible Notes was approximately $276.1 million and $260.4 million, respectively. As of June 30, 2014 and December 31, 2013, the fair value of the 7 1⁄2% Senior Notes due 2022 (the “2022 Notes”) was approximately $854.4 million and $814.7 million, respectively.
	The fair value of the 2022 Notes was determined based on quotes obtained from brokers, which represent Level 1 inputs. We applied fair value concepts in determining the liability component of the 2017 Convertible Notes (see Note 5 – Long-Term Debt) at inception, June 30, 2014 and December 31, 2013. The fair value of the liability was estimated using an income approach. The significant inputs in these determinations were market interest rates based on quotes obtained from brokers and represent Level 2 inputs.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income (Loss)	6 Months Ended
	Jun. 30, 2014
Equity [Abstract]	'
Accumulated Other Comprehensive Income (Loss)	'
	Note 9 – Accumulated Other Comprehensive Income (Loss)
	Changes in accumulated other comprehensive income (loss) by component for the three and six months ended June 30, 2014 were as follows (in millions):
		Cash Flow			Foreign			Total
		Hedges			Currency
					Items
	For the Three Months Ended June 30, 2014
	Beginning balance, net of tax	($	8	)	($	1.2	)	($	9.2	)
	Other comprehensive income (loss) before reclassifications:
	Change in fair value of derivatives		(26.0	)		—			(26.0	)
	Foreign currency translations		—			0.8			0.8
	Income tax effect		9.4			—			9.4
	Net of tax		(16.6	)		0.8			(15.8	)
	Amounts reclassified from accumulated other comprehensive income:
	Operating revenue: oil/gas production		(9.2	)		—			(9.2	)
	Derivative expense, net		(1.5	)		—			(1.5	)
	Income tax effect		3.9			—			3.9
	Net of tax		(6.8	)		—			(6.8	)
	Other comprehensive income (loss), net of tax		(9.8	)		0.8			(9.0	)
	Ending balance, net of tax	($	17.8	)	($	0.4	)	($	18.2	)
		Cash Flow			Foreign			Total
		Hedges			Currency
					Items
	For the Six Months Ended June 30, 2014
	Beginning balance, net of tax	($	1.4	)	($	0.7	)	($	2.1	)
	Other comprehensive income (loss) before reclassifications:
	Change in fair value of derivatives		(43.4	)		—			(43.4	)
	Foreign currency translations		—			0.3			0.3
	Income tax effect		15.7			—			15.7
	Net of tax		(27.7	)		0.3			(27.4	)
	Amounts reclassified from accumulated other comprehensive income:
	Operating revenue: oil/gas production		(16.3	)		—			(16.3	)
	Derivative expense, net		(1.5	)		—			(1.5	)
	Income tax effect		6.5			—			6.5
	Net of tax		(11.3	)		—			(11.3	)
	Other comprehensive income (loss), net of tax		(16.4	)		0.3			(16.1	)
	Ending balance, net of tax	($	17.8	)	($	0.4	)	($	18.2	)
	Changes in accumulated other comprehensive income (loss) by component for the three and six months ended June 30, 2013, were as follows (in millions):
		Cash Flow			Foreign			Total
		Hedges			Currency
					Items
	For the Three Months Ended June 30, 2013
	Beginning balance, net of tax	$	10.5		$	—		$	10.5
	Other comprehensive income (loss) before reclassifications:
	Change in fair value of derivatives		30			—			30
	Foreign currency translations		—			(0.5	)		(0.5	)
	Income tax effect		(10.8	)		—			(10.8	)
	Net of tax		19.2			(0.5	)		18.7
	Amounts reclassified from accumulated other comprehensive income:
	Operating revenue: oil/gas production		7.3			—			7.3
	Income tax effect		(2.6	)		—			(2.6	)
	Net of tax		4.7			—			4.7
	Other comprehensive income (loss), net of tax		14.5			(0.5	)		14
	Ending balance, net of tax	$	25		($	0.5	)	$	24.5
		Cash Flow			Foreign			Total
		Hedges			Currency
					Items
	For the Six Months Ended June 30, 2013
	Beginning balance, net of tax	$	28.8		$	—		$	28.8
	Other comprehensive income (loss) before reclassifications:
	Change in fair value of derivatives		9.9			—			9.9
	Foreign currency translations		—			(0.5	)		(0.5	)
	Income tax effect		(3.5	)		—			(3.5	)
	Net of tax		6.4			(0.5	)		5.9
Amounts reclassified from accumulated other comprehensive income:
Operating revenue: oil/gas production		15.9			—			15.9
Income tax effect		(5.7	)		—			(5.7	)
Net of tax		10.2			—			10.2
Other comprehensive loss, net of tax		(3.8	)		(0.5	)		(4.3	)
Ending balance, net of tax	$	25		($	0.5	)	$	24.5

Investment_in_Oil_and_Gas_Prop

Investment in Oil and Gas Properties	6 Months Ended
	Jun. 30, 2014
Extractive Industries [Abstract]	'
Investment in Oil and Gas Properties	'
	Note 10 – Investment in Oil and Gas Properties
	In April 2013, we entered into an agreement to participate in the drilling of exploratory wells in Canada. Included in unevaluated oil and gas property costs at June 30, 2014 and December 31, 2013, were $14.7 million and $10.6 million, respectively, of capital expenditures related to our oil and gas property investments in Canada.

Commitments_and_Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2014
Commitments And Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	Note 11 – Commitments and Contingencies
	We are named as a party in certain lawsuits and regulatory proceedings arising in the ordinary course of business. We do not expect that these matters, individually or in the aggregate, will have a material adverse effect on our financial condition.
	In August 2013, Kimmeridge Energy Exploration Fund, L.P. (“Kimmeridge”) filed a lawsuit against Stone in the 15th Judicial District Court in Lafayette Parish, Louisiana seeking damages in the amount of approximately $18.4 million plus interest, costs and attorney fees. Kimmeridge alleges that (1) Stone was obligated by virtue of a letter of intent to negotiate in good faith and close an acquisition involving approximately 33,000 net mineral acres in the Illinois basin, and (2) Stone failed to pay brokerage costs incurred after December 31, 2012 pursuant to a separate letter of understanding between Stone and Kimmeridge. Stone denies Kimmeridge’s claims, as well as its damage calculations, and is vigorously defending against both claims. We cannot estimate the potential range of loss at this time.

Recently_Issued_Accounting_Sta

Recently Issued Accounting Standards	6 Months Ended
	Jun. 30, 2014
Accounting Changes And Error Corrections [Abstract]	'
Recently Issued Accounting Standards	'
	Note 12 – Recently Issued Accounting Standards
	In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, “Revenue from Contracts with Customers” to clarify the principles for recognizing revenue and to develop a common revenue standard and disclosure requirements. The core principle of ASU 2014-09 is that an entity will recognize revenue when it transfers control of goods or services to customers at an amount that reflects the consideration to which it expects to be entitled in exchange for those goods or services. The standard is effective for fiscal years beginning after December 15, 2016, and for interim periods within those fiscal years. Early application is not permitted. Entities can choose to apply the standard using either a full retrospective approach or a modified retrospective approach, with the cumulative effect of initially applying ASU 2014-09 recognized at the date of initial application. Although we are still evaluating the effect that this new standard may have on our financial statements and related disclosures, we do not anticipate that the implementation of this new standard will have a material effect.

Subsequent_Events

Subsequent Events	6 Months Ended
	Jun. 30, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	Note 13 – Subsequent Events
	On July 31, 2014, we completed the sale of certain of our non-core properties in the GOM conventional shelf for cash consideration of approximately $177.6 million, after giving effect to preliminary purchase price adjustments, and the assumption of the associated asset retirement obligations. At December 31, 2013, the estimated proved reserves associated with these assets represented approximately 9% of our total estimated proved oil and natural gas reserves. The sale will be accounted for as an adjustment to capitalized costs with no gain or loss recognized since the adjustment will not significantly alter the relationship between capitalized costs and proved reserves.
	All of the proceeds from the sale have been deposited with a Qualified Intermediary (under the terms of a Qualified Trust Agreement and Exchange Agreement) for potential reinvestment in like-kind replacement property as defined under Section 1031 of the Internal Revenue Code. We have until September 14, 2014 (the “Identification Period”) to identify qualified replacement property and have until January 27, 2015 (the “Exchange Period”) to close on such property. Compliance with these provisions provides for deferral of taxable gain on these sales proceeds. The Qualified Trust Agreement and Exchange Agreement provide for certain restrictions on the use of these funds during the Identification Period and, assuming identification is accomplished, additional restrictions during the Exchange Period.

Guarantor_Financial_Statements

Guarantor Financial Statements	6 Months Ended
	Jun. 30, 2014
Guarantees [Abstract]	'
Guarantor Financial Statements	'
	Note 14 – Guarantor Financial Statements
	Stone Offshore is an unconditional guarantor (the “Guarantor Subsidiary”) of the 2017 Convertible Notes and the 2022 Notes. Our other subsidiaries (the “Non-Guarantor Subsidiaries”) have not provided guarantees. The following presents unaudited condensed consolidating financial information as of June 30, 2014 and December 31, 2013 and for the three and six month periods ended June 30, 2014 and 2013 on an issuer (parent company), Guarantor Subsidiary, Non-Guarantor Subsidiaries and consolidated basis. Elimination entries presented are necessary to combine the entities.
	CONDENSED CONSOLIDATING BALANCE SHEET
	30-Jun-14
	(In thousands)
			Parent			Guarantor			Non-			Eliminations			Consolidated
						Subsidiary			Guarantor
									Subsidiaries
	Assets
	Current assets:
	Cash and cash equivalents		$	244,254		$	89,388		$	244		$	—		$	333,886
	Accounts receivable			153,316			80,436			—			(36,257	)		197,495
	Current income tax receivable			7,372			—			—			—			7,372
	Deferred taxes *			1,565			34,743			—			—			36,308
	Inventory			3,440			283			—			—			3,723
	Other current assets			1,955			—			—			—			1,955
	Total current assets			411,902			204,850			244			(36,257	)		580,739
	Oil and gas properties, full cost method:
	Proved			1,475,522			7,044,673			—			—			8,520,195
	Less: accumulated DD&A			(527,605	)		(5,617,210	)		—			—			(6,144,815	)
	Net proved oil and gas properties			947,917			1,427,463			—			—			2,375,380
	Unevaluated			302,396			237,146			14,659			—			554,201
	Other property and equipment, net			28,302			—			—			—			28,302
	Fair value of derivative contracts			—			415			—			—			415
	Other assets, net			30,734			1,880			10,401			—			43,015
	Investment in subsidiary			798,664			—			25,156			(823,820	)		—
	Total assets		$	2,519,915		$	1,871,754		$	50,460		($	860,077	)	$	3,582,052
	Liabilities and Stockholders’ Equity
	Current liabilities:
	Accounts payable to vendors		$	93,251		$	125,177		$	11,729		($	36,257	)	$	193,900
	Undistributed oil and gas proceeds			60,724			2,203			—			—			62,927
	Accrued interest			9,025			—			—			—			9,025
	Fair value of derivative contracts			—			25,711			—			—			25,711
	Asset retirement obligations			—			77,132			—			—			77,132
	Other current liabilities			76,461			3,078			—			—			79,539
	Total current liabilities			239,461			233,301			11,729			(36,257	)		448,234
	Long-term debt			1,033,931			—			—			—			1,033,931
	Deferred taxes *			(16,629	)		420,817			—			—			404,188
	Asset retirement obligations			3,764			427,296			—			—			431,060
	Fair value of derivative contracts			—			5,251			—			—			5,251
	Other long-term liabilities			47,843			—			—			—			47,843
	Total liabilities			1,308,370			1,086,665			11,729			(36,257	)		2,370,507
	Commitments and contingencies
	Stockholders’ equity:
	Common stock			549			—			—			—			549
	Treasury stock			(860	)		—			—			—			(860	)
	Additional paid-in capital			1,624,795			1,309,562			39,580			(1,349,142	)		1,624,795
	Accumulated deficit			(394,778	)		(506,723	)		(28	)		506,751			(394,778	)
	Accumulated other comprehensive loss			(18,161	)		(17,750	)		(821	)		18,571			(18,161	)
	Total stockholders’ equity			1,211,545			785,089			38,731			(823,820	)		1,211,545
	Total liabilities and stockholders’ equity		$	2,519,915		$	1,871,754		$	50,460		($	860,077	)	$	3,582,052
	*	Deferred income taxes have been allocated to the Guarantor Subsidiary where related oil and gas properties reside.
	CONDENSED CONSOLIDATING BALANCE SHEET
	31-Dec-13
	(In thousands)
			Parent			Guarantor			Non-			Eliminations			Consolidated
						Subsidiary			Guarantor
									Subsidiaries
	Assets
	Current assets:
	Cash and cash equivalents		$	246,294		$	84,290		$	640		$	—		$	331,224
	Accounts receivable			74,887			97,128			—			(44	)		171,971
	Fair value of derivative contracts			—			4,549			—			—			4,549
Current income tax receivable			7,366			—			—			—			7,366
Deferred taxes *			8,659			23,051			—			—			31,710
Inventory			3,440			283			—			—			3,723
Other current assets			1,874			—			—			—			1,874
Total current assets			342,520			209,301			640			(44	)		552,417
Oil and gas properties, full cost method:
Proved			1,309,527			6,494,590			—			—			7,804,117
Less: accumulated DD&A			(459,932	)		(5,448,828	)		—			—			(5,908,760	)
Net proved oil and gas properties			849,595			1,045,762			—			—			1,895,357
Unevaluated			325,113			388,643			10,583			—			724,339
Other property and equipment, net			26,178			—			—			—			26,178
Fair value of derivative contracts			—			1,378			—			—			1,378
Other assets, net			45,410			1,349			2,128			—			48,887
Investment in subsidiary			747,472			—			12,711			(760,183	)		—
Total assets		$	2,336,288		$	1,646,433		$	26,062		($	760,227	)	$	3,248,556
Liabilities and Stockholders’ Equity
Current liabilities:
Accounts payable to vendors		$	173,147		$	22,530		$	44		($	44	)	$	195,677
Undistributed oil and gas proceeds			34,386			2,643			—			—			37,029
Accrued interest			9,022			—			—			—			9,022
Fair value of derivative contracts			—			7,753			—			—			7,753
Asset retirement obligations			—			67,161			—			—			67,161
Other current liabilities			53,682			838			—			—			54,520
Total current liabilities			270,237			100,925			44			(44	)		371,162
Long-term debt			1,027,084			—			—			—			1,027,084
Deferred taxes *			10,227			380,466			—			—			390,693
Asset retirement obligations			4,945			430,407			—			—			435,352
Fair value of derivative contracts			—			470			—			—			470
Other long-term liabilities			53,509			—			—			—			53,509
Total liabilities			1,366,002			912,268			44			(44	)		2,278,270
Commitments and contingencies
Stockholders’ equity:
Common stock			488			—			—			—			488
Treasury stock			(860	)		—			—			—			(860	)
Additional paid-in capital			1,397,885			1,309,563			27,403			(1,336,966	)		1,397,885
Accumulated deficit			(425,165	)		(574,003	)		(52	)		574,055			(425,165	)
Accumulated other comprehensive loss			(2,062	)		(1,395	)		(1,333	)		2,728			(2,062	)
Total stockholders’ equity			970,286			734,165			26,018			(760,183	)		970,286
Total liabilities and stockholders’ equity		$	2,336,288		$	1,646,433		$	26,062		($	760,227	)	$	3,248,556
*	Deferred income taxes have been allocated to the Guarantor Subsidiary where related oil and gas properties reside.
CONDENSED CONSOLIDATING STATEMENT OF INCOME
THREE MONTHS ENDED JUNE 30, 2014
(In thousands)
		Parent			Guarantor			Non-			Eliminations			Consolidated
					Subsidiary			Guarantor
								Subsidiaries
Operating revenue:
Oil production		$	5,854		$	136,539		$	—		$	—		$	142,393
Gas production			20,800			25,867			—			—			46,667
Natural gas liquids production			10,219			5,717			—			—			15,936
Other operational income			1,880			170			—			—			2,050
Total operating revenue			38,753			168,293			—			—			207,046
Operating expenses:
Lease operating expenses			5,046			44,408			—			—			49,454
Transportation, processing and gathering expenses			10,456			3,642			—			—			14,098
Production taxes			1,903			1,354			—			—			3,257
Depreciation, depletion, amortization			30,385			62,450			—			—			92,835
Accretion expense			61			7,672			—			—			7,733
Salaries, general and administrative			16,639			—			(2	)		—			16,637
Incentive compensation expense			3,903			—			—			—			3,903
Derivative expense, net			—			2,516			—			—			2,516
Total operating expenses			68,393			122,042			(2	)		—			190,433
Income (loss) from operations			(29,640	)		46,251			2			—			16,613
Other (income) expenses:
Interest expense			9,880			33			—			—			9,913
Interest income			(146	)		(41	)		(6	)		—			(193	)
Other income			(192	)		(530	)		—			—			(722	)
Other expense			179			—			—			—			179
Income from investment in subsidiaries			(29,947	)		—			(8	)		29,955			—
Total other (income) expenses			(20,226	)		(538	)		(14	)		29,955			9,177
Income (loss) before taxes			(9,414	)		46,789			16			(29,955	)		7,436
Provision (benefit) for income taxes:
Current			—			—			—			—			—
Deferred			(13,858	)		16,850			—			—			2,992
Total income taxes			(13,858	)		16,850			—			—			2,992
Net income		$	4,444		$	29,939		$	16		($	29,955	)	$	4,444
Comprehensive income (loss)		($	4,566	)	$	29,939		$	16		($	29,955	)	($	4,566	)
CONDENSED CONSOLIDATING STATEMENT OF INCOME
THREE MONTHS ENDED JUNE 30, 2013
(In thousands)
		Parent			Guarantor			Non-			Eliminations			Consolidated
					Subsidiary			Guarantor
								Subsidiaries
Operating revenue:
Oil production		$	8,378		$	176,120		$	—		$	—		$	184,498
Gas production			20,071			27,761			—			—			47,832
Natural gas liquids production			6,378			4,822			—			—			11,200
Other operational income			790			189			—			—			979
Derivate income, net			—			1,368			—			—			1,368
Total operating revenue			35,617			210,260			—			—			245,877
Operating expenses:
Lease operating expenses			3,425			47,092			—			—			50,517
Transportation, processing and gathering expenses			5,729			3,167			—			—			8,896
Production taxes			1,320			2,771			—			—			4,091
Depreciation, depletion, amortization			25,088			62,121			—			—			87,209
Accretion expense			93			8,225			—			—			8,318
Salaries, general and administrative			15,150			—			48			—			15,198
Incentive compensation expense			2,050			—			—			—			2,050
Other operational expenses			51			22			—						73
Total operating expenses			52,906			123,398			48			—			176,352
Income (loss) from operations			(17,289	)		86,862			(48	)		—			69,525
Other (income) expenses:
Interest expense			8,882			13			—			—			8,895
Interest income			(70	)		(38	)		(7	)		—			(115	)
Other income			(217	)		(465	)		—			—			(682	)
(Income) loss from investment in subsidiaries			(55,893	)		—			39			55,854			—
Total other (income) expenses			(47,298	)		(490	)		32			55,854			8,098
Income (loss) before taxes			30,009			87,352			(80	)		(55,854	)		61,427
Provision (benefit) for income taxes:
Current			(6,993	)		—			—			—			(6,993	)
Deferred			(2,020	)		31,418			—			—			29,398
Total income taxes			(9,013	)		31,418			—			—			22,405
Net income (loss)		$	39,022		$	55,934		($	80	)	($	55,854	)	$	39,022
Comprehensive income (loss)		$	53,060		$	55,934		($	80	)	($	55,854	)	$	53,060
CONDENSED CONSOLIDATING STATEMENT OF INCOME
SIX MONTHS ENDED JUNE 30, 2014
(In thousands)
		Parent			Guarantor			Non-			Eliminations			Consolidated
					Subsidiary			Guarantor
								Subsidiaries
Operating revenue:
Oil production		$	12,490		$	268,192		$	—		$	—		$	280,682
Gas production			49,639			53,390			—			—			103,029
Natural gas liquids production			28,473			15,433			—			—			43,906
Other operational income			2,704			343			—			—			3,047
Total operating revenue			93,306			337,358			—			—			430,664
Operating expenses:
Lease operating expenses			9,059			87,298			—			—			96,357
Transportation, processing and gathering expenses			20,773			7,951			—			—			28,724
Production taxes			3,584			2,735			—			—			6,319
Depreciation, depletion, amortization			58,440			117,041			—			—			175,481
Accretion expense			129			15,159			—			—			15,288
Salaries, general and administrative			32,964			2			—			—			32,966
Incentive compensation expense			7,037			—			—			—			7,037
Other operational expenses			176			36			—			—			212
Derivative expense, net			—			3,115			—			—			3,115
Total operating expenses			132,162			233,337			—			—			365,499
Income (loss) from operations			(38,856	)		104,021			—			—			65,165
Other (income) expenses:
Interest expense			18,233			37			—			—			18,270
Interest income			(225	)		(99	)		(12	)		—			(336	)
Other income			(373	)		(1,056	)		—			—			(1,429	)
Other expense			179			—			—			—			179
Income from investment in subsidiaries			(67,292	)		—			(12	)		67,304			—
Total other (income) expenses			(49,478	)		(1,118	)		(24	)		67,304			16,684
Income before taxes			10,622			105,139			24			(67,304	)		48,481
Provision (benefit) for income taxes:
Current			—			—			—			—			—
Deferred			(19,765	)		37,859			—			—			18,094
Total income taxes			(19,765	)		37,859			—			—			18,094
Net income		$	30,387		$	67,280		$	24		($	67,304	)	$	30,387
Comprehensive income		$	14,288		$	67,280		$	24		($	67,304	)	$	14,288
CONDENSED CONSOLIDATING STATEMENT OF INCOME
SIX MONTHS ENDED JUNE 30, 2013
(In thousands)
		Parent			Guarantor			Non-			Eliminations			Consolidated
					Subsidiary			Guarantor
								Subsidiaries
Operating revenue:
Oil production		$	13,721		$	357,702		$	—		$	—		$	371,423
Gas production			27,269			57,385			—			—			84,654
Natural gas liquids production			8,677			11,701			—			—			20,378
Other operational income			1,439			347			—			—			1,786
Derivate income, net			—			147			—			—			147
Total operating revenue			51,106			427,282			—			—			478,388
Operating expenses:
Lease operating expenses			5,716			97,845			—			—			103,561
Transportation, processing and gathering expenses			7,781			6,512			—			—			14,293
Production taxes			2,187			3,993			—			—			6,180
Depreciation, depletion, amortization			35,279			127,365			—			—			162,644
Accretion expense			186			16,395			—			—			16,581
Salaries, general and administrative			29,098			4			48			—			29,150
Incentive compensation expense			3,481			—			—			—			3,481
Other operational expenses			101			44			—						145
Total operating expenses			83,829			252,158			48			—			336,035
Income (loss) from operations			(32,723	)		175,124			(48	)		—			142,353
Other (income) expenses:
Interest expense			18,509			21			—			—			18,530
Interest income			(150	)		(75	)		(7	)		—			(232	)
Other income			(441	)		(967	)		—			—			(1,408	)
(Income) loss from investment in subsidiaries			(112,721	)		—			39			112,682			—
Total other (income) expenses			(94,803	)		(1,021	)		32			112,682			16,890
Income (loss) before taxes			62,080			176,145			(80	)		(112,682	)		125,463
Provision (benefit) for income taxes:
Current			(10,739	)		—			—			—			(10,739	)
Deferred			(6,961	)		63,383			—			—			56,422
Total income taxes			(17,700	)		63,383			—			—			45,683
Net income (loss)		$	79,780		$	112,762		($	80	)	($	112,682	)	$	79,780
Comprehensive income (loss)		$	75,477		$	112,762		($	80	)	($	112,682	)	$	75,477
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
SIX MONTHS ENDED JUNE 30, 2014
(In thousands)
		Parent			Guarantor			Non-			Eliminations			Consolidated
					Subsidiary			Guarantor
								Subsidiaries
Cash flows from operating activities:
Net income		$	30,387		$	67,280		$	24		($	67,304	)	$	30,387
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization			58,440			117,041			—			—			175,481
Accretion expense			129			15,159			—			—			15,288
Deferred income tax provision (benefit)			(19,765	)		37,859			—			—			18,094
Settlement of asset retirement obligations			(82	)		(24,833	)		—			—			(24,915	)
Non-cash stock compensation expense			5,358			—			—			—			5,358
Non-cash derivative expense			—			2,697			—			—			2,697
Non-cash interest expense			8,229			—			—			—			8,229
Change in current income taxes			(6	)		—			—			—			(6	)
Non-cash income from investment in subsidiaries			(67,292	)		—			(12	)		67,304			—
Change in intercompany receivables/payables			(126,526	)		114,841			11,685			—			—
(Increase) decrease in accounts receivable			(42,216	)		16,692			—			—			(25,524	)
Increase in other current assets			(82	)		—			—			—			(82	)
Increase (decrease) in accounts payable			2,052			(209	)		—			—			1,843
Increase in other current liabilities			48,987			1,798			—			—			50,785
Other			381			(1,056	)		—			—			(675	)
Net cash (used in) provided by operating activities			(102,006	)		347,269			11,697			—			256,960
Cash flows from investing activities:
Investment in oil and gas properties			(121,836	)		(384,349	)		(11,719	)		—			(517,904	)
Proceeds from sale of oil and gas properties, net of expenses			9,777			42,178			—			—			51,955
Investment in fixed and other assets			(3,896	)		—			—			—			(3,896	)
Change in restricted funds			—			—			(356	)		—			(356	)
Investment in subsidiaries			—			—			(12,176	)		12,176			—
Net cash used in investing activities			(115,955	)		(342,171	)		(24,251	)		12,176			(470,201	)
Cash flows from financing activities:
Net proceeds from issuance of common stock			226,036			—			—			—			226,036
Deferred financing costs			(3,167	)		—			—			—			(3,167	)
Equity proceeds from parent			—			—			12,176			(12,176	)		—
Net payments for share-based compensation			(6,948	)		—			—			—			(6,948	)
Net cash provided by financing activities			215,921			—			12,176			(12,176	)		215,921
Effect of exchange rate changes on cash			—			—			(18	)		—			(18	)
Net change in cash and cash equivalents			(2,040	)		5,098			(396	)		—			2,662
Cash and cash equivalents, beginning of period			246,294			84,290			640			—			331,224
Cash and cash equivalents, end of period		$	244,254		$	89,388		$	244		$	—		$	333,886
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
SIX MONTHS ENDED JUNE 30, 2013
(In thousands)
		Parent			Guarantor			Non-			Eliminations			Consolidated
					Subsidiary			Guarantor
								Subsidiaries
Cash flows from operating activities:
Net income (loss)		$	79,780		$	112,762		($	80	)	($	112,682	)	$	79,780
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization			35,279			127,365			—			—			162,644
Accretion expense			186			16,395			—			—			16,581
Deferred income tax provision (benefit)			(6,961	)		63,383			—			—			56,422
Settlement of asset retirement obligations			—			(37,335	)		—			—			(37,335	)
Non-cash stock compensation expense			4,866			—			—			—			4,866
Excess tax benefits			(104	)		—			—			—			(104	)
Non-cash derivative expense			—			311			—			—			311
Non-cash interest expense			8,181			—			—			—			8,181
Non-cash income (loss) from investment in subsidiaries			(112,722	)		—			40			112,682			—
Change in current income taxes			(16,399	)		—			—			—			(16,399	)
Change in intercompany receivables/payables			170,815			(170,859	)		44			—			—
(Increase) decrease in accounts receivable			(17,365	)		18,503			—			—			1,138
Increase in other current assets			(245	)		—			—			—			(245	)
Decrease in inventory			158			—			—			—			158
Increase in accounts payable			4,507			2,086			—			—			6,593
Increase (decrease) in other current liabilities			(5,258	)		2,088			—			—			(3,170	)
Other			(2,482	)		(966	)		—			—			(3,448	)
Net cash provided by operating activities			142,236			133,733			4			—			275,973
Cash flows from investing activities:
Investment in oil and gas properties			(176,896	)		(133,659	)		(9,663	)		—			(320,218	)
Investment in fixed and other assets			(1,711	)		—			—			—			(1,711	)
Change in restricted funds			—			—			(3,515	)		—			(3,515	)
Investment in subsidiaries			(14,000	)		—			(13,404	)		27,404			—
Net cash used in investing activities			(192,607	)		(133,659	)		(26,582	)		27,404			(325,444	)
Cash flows from financing activities:
Deferred financing costs			(11	)		—			—			—			(11	)
Excess tax benefits			104			—			—			—			104
Equity proceeds from parent			—			—			27,404			(27,404	)		—
Net payments for share-based compensation			(3,590	)		—			—			—			(3,590	)
Net cash (used in) provided by financing activities			(3,497	)		—			27,404			(27,404	)		(3,497	)
Effect of exchange rate on cash			—			—			(186	)		—			(186	)
Net change in cash and cash equivalents			(53,868	)		74			640			—			(53,154	)
Cash and cash equivalents, beginning of period			228,398			51,128			—			—			279,526
Cash and cash equivalents, end of period		$	174,530		$	51,202		$	640		$	—		$	226,372

Earnings_Per_Share_Policies

Earnings Per Share (Policies)	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Earning Per Share	'
	Because it is management’s stated intention to redeem the principal amount of our 1 3⁄4% Senior Convertible Notes due 2017 (the “2017 Convertible Notes”) (see Note 5 – Long-Term Debt) in cash, we have used the treasury method for determining dilution in the diluted earnings per share computation. During the three months ended June 30, 2014, the average price of our common stock exceeded the effective conversion price of the 2017 Convertible Notes, and therefore, such notes were dilutive for the three and six months ended June 30, 2014. For the prior year periods presented, the average price of our common stock was less than the effective conversion price for such notes, resulting in no dilutive effect on the diluted earnings per share computation for such periods. For all periods presented, the average price of our common stock was less than the strike price of the Sold Warrants (as defined in Note 5 – Long-Term Debt) and therefore, such warrants were not dilutive for such periods. Based on the terms of the Purchased Call Options (as defined in Note 5 – Long-Term Debt), such call options are antidilutive and therefore, were not included in the calculation of diluted earnings per share.
Derivative Instruments and Hedging Activities	'
	The nature of a derivative instrument must be evaluated to determine if it qualifies as a hedging instrument. If the instrument qualifies as a hedging instrument, it is recorded as either an asset or liability measured at fair value and subsequent changes in the derivative’s fair value are recognized in stockholders’ equity through other comprehensive income (loss), net of related taxes, to the extent the hedge is considered effective. Monthly settlements of effective hedges are reflected in revenue from oil and gas production and cash flows from operating activities. Instruments not qualifying as hedging instruments are recorded in our balance sheet at fair value, and changes in fair value are recognized in earnings through derivative expense (income). Monthly settlements of ineffective hedges and derivative instruments not qualifying as hedging instruments are recognized in earnings through derivative expense (income) and cash flows from operating activities.
Fair Value of Financial Instruments	'
	U.S. Generally Accepted Accounting Principles (“GAAP”) establish a fair value hierarchy that has three levels based on the reliability of the inputs used to determine the fair value. These levels include: Level 1, defined as inputs such as unadjusted quoted prices in active markets for identical assets or liabilities; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs for use when little or no market data exists, therefore requiring an entity to develop its own assumptions.

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Calculation of Basic and Diluted Weighted Average Shares Outstanding Earnings Per Share	'
	The following table sets forth the calculation of basic and diluted weighted average shares outstanding and earnings per share for the indicated periods:
		Three Months Ended						Six Months Ended
		June 30,						June 30,
		2014			2013			2014			2013
		(In thousands, except per share data)
	Income (numerator):
	Basic:
	Net income	$	4,444		$	39,022		$	30,387		$	79,780
	Net income attributable to participating securities		(111	)		(1,015	)		(698	)		(1,794	)
	Net income attributable to common stock - basic	$	4,333		$	38,007		$	29,689		$	77,986
	Diluted:
	Net income	$	4,444		$	39,022		$	30,387		$	79,780
	Net income attributable to participating securities		(111	)		(1,015	)		(697	)		(1,793	)
	Net income attributable to common stock - diluted	$	4,333		$	38,007		$	29,690		$	77,987
	Weighted average shares (denominator):
	Weighted average shares - basic		52,050			48,687			50,540			48,653
	Dilutive effect of stock options		58			38			54			38
	Dilutive effect of convertible notes		265			—			133			—
	Weighted average shares - diluted		52,373			48,725			50,727			48,691
	Basic earnings per share	$	0.08		$	0.78		$	0.59		$	1.6
	Diluted earnings per share	$	0.08		$	0.78		$	0.59		$	1.6

Derivative_Instruments_and_Hed1

Derivative Instruments and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 2014
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Hedging Positions	'
	The following table illustrates our derivative positions for calendar years 2014, 2015 and 2016 as of August 5, 2014:
			Fixed-Price Swaps (NYMEX, except where noted)
			Natural Gas							Oil
			Daily Volume				Swap Price			Daily Volume				Swap Price
			(MMBtus/d)				($)			(Bbls/d)				($)
	2014			10,000				4			1,000				90.06
	2014			10,000				4.04			1,000	(a)			90.25
	2014			10,000				4.105			1,000				92.25
	2014			10,000				4.19			1,000				93.55
	2014			10,000	(b)			4.25			1,000				94
	2014			10,000				4.25			1,000				98
	2014			10,000				4.35			1,000				98.3
	2014										2,000	(c)			98.85
	2014										1,000				99.65
	2014										1,000	(d)			103.3
	2015			10,000				4.005			1,000				89
	2015			10,000				4.12			1,000				90
	2015			10,000				4.15			1,000				90.25
	2015			10,000				4.165			1,000				90.4
	2015			10,000				4.22			1,000				93.28
	2015			10,000				4.255			1,000				93.37
	2015										1,000				94.85
	2015										1,000				95
	2016			10,000				4.11
	2016			10,000				4.12
	(a)	October through December
	(b)	February through December
	(c)	January through June
	(d)	Brent crude oil contract
Location and Fair Value Amounts of Derivative Instruments Reported in Balance Sheet	'
	The following tables disclose the location and fair value amounts of derivatives qualifying as hedging instruments, as reported in our balance sheet, at June 30, 2014 and December 31, 2013:
	Fair Value of Derivatives Qualifying as Hedging Instruments at June 30, 2014
	(In millions)
			Asset Derivatives						Liability Derivatives
	Description		Balance Sheet Location		Fair				Balance Sheet Location	Fair
					Value					Value
	Commodity contracts		Current assets: Fair value of derivative contracts		$	—			Current liabilities: Fair value of derivative contracts	$	24.2
			Long-term assets: Fair value of derivative contracts			0.4			Long-term liabilities: Fair value of derivative contracts		5.3
					$	0.4				$	29.5
	Fair Value of Derivatives Qualifying as Hedging Instruments at December 31, 2013
	(In millions)
			Asset Derivatives						Liability Derivatives
	Description		Balance Sheet Location		Fair				Balance Sheet Location	Fair
					Value					Value
	Commodity contracts		Current assets: Fair value of derivative contracts		$	4.5			Current liabilities: Fair value of derivative contracts	$	7.8
			Long-term assets: Fair value of derivative contracts			1.4			Long-term liabilities: Fair value of derivative contracts		0.5
					$	5.9				$	8.3
Before Tax Effect of Derivative Instruments in Statement of Income	'
	The following tables disclose the before tax effect of derivatives qualifying as hedging instruments, as reported in the statement of income, for the three and six month periods ended June 30, 2014 and 2013:
	Effect of Derivatives Qualifying as Hedging Instruments on the Statement of Income
	for the Three Months Ended June 30, 2014 and 2013
	(In millions)
	Derivatives in Cash		Amount of Gain							Gain (Loss) Reclassified from								Gain (Loss) Recognized in Income
			(Loss) Recognized
	Flow Hedging		in Other							Accumulated Other Comprehensive								on Derivatives
			Comprehensive
	Relationships		Income on							Income into Income								(Ineffective Portion)
			Derivatives
										(Effective Portion) (a)
			2014				2013			Location		2014				2013		Location	2014			2013
	Commodity contracts		($	26	)		$	30		Operating revenue - oil/gas production		($	9.2	)		$	7.3	Derivative (expense) income, net	($	1	)	$	1.4
	Total		($	26	)		$	30				($	9.2	)		$	7.3		($	1	)	$	1.4
	(a)    For the three months ended June 30, 2014, effective hedging contracts decreased oil revenue by $6.1 million and decreased gas revenue by $3.1 million. For the three months ended June 30, 2013, effective hedging contracts increased oil revenue by $5.3 million and increased gas revenue by $2.0 million.
	Effect of Derivatives Qualifying as Hedging Instruments on the Statement of Income
	for the Six Months Ended June 30, 2014 and 2013
	(In millions)
	Derivatives in Cash		Amount of Gain							Gain (Loss) Reclassified from								Gain (Loss) Recognized in Income
			(Loss) Recognized
	Flow Hedging		in Other							Accumulated Other Comprehensive								on Derivatives
			Comprehensive
	Relationships		Income on							Income into Income								(Ineffective Portion)
			Derivatives
										(Effective Portion) (a)
			2014				2013			Location		2014				2013		Location	2014			2013
	Commodity contracts		($	43.4	)		$	9.9		Operating revenue - oil/gas production		($	16.3	)		$	15.9	Derivative (expense) income, net	($	1.6	)	$	0.1
	Total		($	43.4	)		$	9.9				($	16.3	)		$	15.9		($	1.6	)	$	0.1
	(a)	For the six months ended June 30, 2014, effective hedging contracts decreased oil revenue by $8.6 million and decreased gas revenue by $7.7 million. For the six months ended June 30, 2013, effective hedging contracts increased oil revenue by $9.9 million and increased gas revenue by $6.0 million.
Location and Fair Value Amounts of Derivative Instruments Not Qualifying as Hedging Instruments Reported in Balance Sheet	'
	The following table discloses the location and fair value amounts of our derivatives not qualifying as hedging instruments, as reported in our balance sheet, at June 30, 2014. All of our derivatives at December 31, 2013 qualified as hedging instruments.
	Fair Value of Derivatives Not Qualifying as Hedging Instruments at June 30, 2014
	(In millions)
	Description		Balance Sheet Location		Fair Value
	Commodity contracts		Current liabilities: Fair value of derivative contracts		$	1.5
Gains or Losses Related to Changes in Fair Value and Cash Settlements on Derivatives Not Qualifying as Hedging Instruments	'
	Gains or losses related to changes in fair value and cash settlements for derivatives not qualifying as hedging instruments are recorded as derivative income (expense) in the statement of income. The following table discloses the before tax effect of our derivatives not qualifying as hedging instruments on the statement of income for the three and six month periods ended June 30, 2014:
	Amount of Loss Recognized in Derivative Expense
	(In millions)
	Description		Three Months Ended				Six Months Ended
			June 30, 2014				June 30, 2014
	Commodity contracts:
	Cash settlements		$	—			$	—
	Change in fair value			(1.5	)			(1.5	)
	Total losses on non-qualifying hedges		($	1.5	)		($	1.5	)
Impact of Rights of Offset Associated with Recognized Assets and Liabilities	'
	The following presents the potential impact of the rights of offset associated with our recognized assets and liabilities at June 30, 2014 (in millions):
			As Presented				Effects of			With Effects of
			Without				Netting			Netting
			Netting
	Current assets: Fair value of derivative contracts		$	—			$	—		$	—
	Long-term assets: Fair value of derivative contracts			0.4				(0.4	)		—
	Current liabilities: Fair value of derivative contracts			(25.7	)			—			(25.7	)
	Long-term liabilities: Fair value of derivative contracts			(5.3	)			0.4			(4.9	)

LongTerm_Debt_Tables

Long-Term Debt (Tables)	6 Months Ended
	Jun. 30, 2014
Debt Disclosure [Abstract]	'
Long-Term Debt	'
	Long-term debt consisted of the following at:
		June 30,		December 31,
		2014		2013
		(In millions)
	1 3⁄4% Senior Convertible Notes due 2017	$	258.9	$	252.1
	7 1⁄2% Senior Notes due 2022		775		775
	Bank debt		—		—
	Total long-term debt	$	1,033.90	$	1,027.10

Asset_Retirement_Obligations_T

Asset Retirement Obligations (Tables)	6 Months Ended
	Jun. 30, 2014
Asset Retirement Obligation Disclosure [Abstract]	'
Changes in Asset Retirement Obligations	'
	The change in our asset retirement obligations during the six months ended June 30, 2014 is set forth below:
		Six Months
		Ended
		June 30, 2014
		(In millions)
	Asset retirement obligations as of the beginning of the period, including current portion	$	502.5
	Liabilities incurred		25.7
	Liabilities settled		(24.9	)
	Divestment of properties		(10.4	)
	Accretion expense		15.3
	Asset retirement obligations as of the end of the period, including current portion	$	508.2

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Schedule of Assets And Liabilities Measured at Fair Value Recurring Basis	'
	The following tables present our assets and liabilities that are measured at fair value on a recurring basis at June 30, 2014:
		Fair Value Measurements at June 30, 2014
	Assets	Total		Quoted Prices		Significant		Significant
				in Active		Other		Unobservable
				Markets for		Observable		Inputs
				Identical Assets		Inputs		(Level 3)
				(Level 1)		(Level 2)
		(In millions)
	Marketable securities (Other Assets)	$	8.7	$	8.7	$	—	$	—
	Derivative contracts		0.4		—		0.4		—
	Total	$	9.1	$	8.7	$	0.4	$	—
		Fair Value Measurements at June 30, 2014
	Liabilities	Total		Quoted Prices		Significant		Significant
				in Active		Other		Unobservable
				Markets for		Observable		Inputs
				Identical		Inputs		(Level 3)
				Liabilities		(Level 2)
				(Level 1)
		(In millions)
	Derivative contracts	$	31	$	—	$	31	$	—
	Total	$	31	$	—	$	31	$	—
	The following tables present our assets and liabilities that are measured at fair value on a recurring basis at December 31, 2013:
		Fair Value Measurements at December 31, 2013
	Assets	Total		Quoted Prices		Significant		Significant
				in Active		Other		Unobservable
				Markets for		Observable		Inputs
				Identical Assets		Inputs		(Level 3)
				(Level 1)		(Level 2)
		(In millions)
	Marketable securities (Other Assets)	$	8.2	$	8.2	$	—	$	—
	Derivative contracts		5.9		—		5.9		—
	Total	$	14.1	$	8.2	$	5.9	$	—
		Fair Value Measurements at December 31, 2013
	Liabilities	Total		Quoted Prices		Significant		Significant
				in Active		Other		Unobservable
				Markets for		Observable		Inputs
				Identical		Inputs		(Level 3)
				Liabilities		(Level 2)
				(Level 1)
		(In millions)
	Derivative contracts	$	8.3	$	—	$	8.3	$	—
	Total	$	8.3	$	—	$	8.3	$	—

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Jun. 30, 2014
Equity [Abstract]	'
Schedule of Changes In Accumulated Other Comprehensive Income Loss	'
	Changes in accumulated other comprehensive income (loss) by component for the three and six months ended June 30, 2014 were as follows (in millions):
		Cash Flow			Foreign			Total
		Hedges			Currency
					Items
	For the Three Months Ended June 30, 2014
	Beginning balance, net of tax	($	8	)	($	1.2	)	($	9.2	)
	Other comprehensive income (loss) before reclassifications:
	Change in fair value of derivatives		(26.0	)		—			(26.0	)
	Foreign currency translations		—			0.8			0.8
	Income tax effect		9.4			—			9.4
	Net of tax		(16.6	)		0.8			(15.8	)
	Amounts reclassified from accumulated other comprehensive income:
	Operating revenue: oil/gas production		(9.2	)		—			(9.2	)
	Derivative expense, net		(1.5	)		—			(1.5	)
	Income tax effect		3.9			—			3.9
	Net of tax		(6.8	)		—			(6.8	)
	Other comprehensive income (loss), net of tax		(9.8	)		0.8			(9.0	)
	Ending balance, net of tax	($	17.8	)	($	0.4	)	($	18.2	)
		Cash Flow			Foreign			Total
		Hedges			Currency
					Items
	For the Six Months Ended June 30, 2014
	Beginning balance, net of tax	($	1.4	)	($	0.7	)	($	2.1	)
	Other comprehensive income (loss) before reclassifications:
	Change in fair value of derivatives		(43.4	)		—			(43.4	)
	Foreign currency translations		—			0.3			0.3
	Income tax effect		15.7			—			15.7
	Net of tax		(27.7	)		0.3			(27.4	)
	Amounts reclassified from accumulated other comprehensive income:
	Operating revenue: oil/gas production		(16.3	)		—			(16.3	)
	Derivative expense, net		(1.5	)		—			(1.5	)
	Income tax effect		6.5			—			6.5
	Net of tax		(11.3	)		—			(11.3	)
	Other comprehensive income (loss), net of tax		(16.4	)		0.3			(16.1	)
	Ending balance, net of tax	($	17.8	)	($	0.4	)	($	18.2	)
	Changes in accumulated other comprehensive income (loss) by component for the three and six months ended June 30, 2013, were as follows (in millions):
		Cash Flow			Foreign			Total
		Hedges			Currency
					Items
	For the Three Months Ended June 30, 2013
	Beginning balance, net of tax	$	10.5		$	—		$	10.5
	Other comprehensive income (loss) before reclassifications:
	Change in fair value of derivatives		30			—			30
	Foreign currency translations		—			(0.5	)		(0.5	)
	Income tax effect		(10.8	)		—			(10.8	)
	Net of tax		19.2			(0.5	)		18.7
	Amounts reclassified from accumulated other comprehensive income:
	Operating revenue: oil/gas production		7.3			—			7.3
	Income tax effect		(2.6	)		—			(2.6	)
	Net of tax		4.7			—			4.7
	Other comprehensive income (loss), net of tax		14.5			(0.5	)		14
	Ending balance, net of tax	$	25		($	0.5	)	$	24.5
		Cash Flow			Foreign			Total
		Hedges			Currency
					Items
	For the Six Months Ended June 30, 2013
	Beginning balance, net of tax	$	28.8		$	—		$	28.8
	Other comprehensive income (loss) before reclassifications:
	Change in fair value of derivatives		9.9			—			9.9
	Foreign currency translations		—			(0.5	)		(0.5	)
	Income tax effect		(3.5	)		—			(3.5	)
	Net of tax		6.4			(0.5	)		5.9
	Amounts reclassified from accumulated other comprehensive income:
Operating revenue: oil/gas production		15.9			—			15.9
Income tax effect		(5.7	)		—			(5.7	)
Net of tax		10.2			—			10.2
Other comprehensive loss, net of tax		(3.8	)		(0.5	)		(4.3	)
Ending balance, net of tax	$	25		($	0.5	)	$	24.5

Guarantor_Financial_Statements1

Guarantor Financial Statements (Tables)	6 Months Ended
	Jun. 30, 2014
Guarantees [Abstract]	'
Condensed Consolidating Balance Sheet	'
	CONDENSED CONSOLIDATING BALANCE SHEET
	30-Jun-14
	(In thousands)
			Parent			Guarantor			Non-			Eliminations			Consolidated
						Subsidiary			Guarantor
									Subsidiaries
	Assets
	Current assets:
	Cash and cash equivalents		$	244,254		$	89,388		$	244		$	—		$	333,886
	Accounts receivable			153,316			80,436			—			(36,257	)		197,495
	Current income tax receivable			7,372			—			—			—			7,372
	Deferred taxes *			1,565			34,743			—			—			36,308
	Inventory			3,440			283			—			—			3,723
	Other current assets			1,955			—			—			—			1,955
	Total current assets			411,902			204,850			244			(36,257	)		580,739
	Oil and gas properties, full cost method:
	Proved			1,475,522			7,044,673			—			—			8,520,195
	Less: accumulated DD&A			(527,605	)		(5,617,210	)		—			—			(6,144,815	)
	Net proved oil and gas properties			947,917			1,427,463			—			—			2,375,380
	Unevaluated			302,396			237,146			14,659			—			554,201
	Other property and equipment, net			28,302			—			—			—			28,302
	Fair value of derivative contracts			—			415			—			—			415
	Other assets, net			30,734			1,880			10,401			—			43,015
	Investment in subsidiary			798,664			—			25,156			(823,820	)		—
	Total assets		$	2,519,915		$	1,871,754		$	50,460		($	860,077	)	$	3,582,052
	Liabilities and Stockholders’ Equity
	Current liabilities:
	Accounts payable to vendors		$	93,251		$	125,177		$	11,729		($	36,257	)	$	193,900
	Undistributed oil and gas proceeds			60,724			2,203			—			—			62,927
	Accrued interest			9,025			—			—			—			9,025
	Fair value of derivative contracts			—			25,711			—			—			25,711
	Asset retirement obligations			—			77,132			—			—			77,132
	Other current liabilities			76,461			3,078			—			—			79,539
	Total current liabilities			239,461			233,301			11,729			(36,257	)		448,234
	Long-term debt			1,033,931			—			—			—			1,033,931
	Deferred taxes *			(16,629	)		420,817			—			—			404,188
	Asset retirement obligations			3,764			427,296			—			—			431,060
	Fair value of derivative contracts			—			5,251			—			—			5,251
	Other long-term liabilities			47,843			—			—			—			47,843
	Total liabilities			1,308,370			1,086,665			11,729			(36,257	)		2,370,507
	Commitments and contingencies
	Stockholders’ equity:
	Common stock			549			—			—			—			549
	Treasury stock			(860	)		—			—			—			(860	)
	Additional paid-in capital			1,624,795			1,309,562			39,580			(1,349,142	)		1,624,795
	Accumulated deficit			(394,778	)		(506,723	)		(28	)		506,751			(394,778	)
	Accumulated other comprehensive loss			(18,161	)		(17,750	)		(821	)		18,571			(18,161	)
	Total stockholders’ equity			1,211,545			785,089			38,731			(823,820	)		1,211,545
	Total liabilities and stockholders’ equity		$	2,519,915		$	1,871,754		$	50,460		($	860,077	)	$	3,582,052
	*	Deferred income taxes have been allocated to the Guarantor Subsidiary where related oil and gas properties reside.
	CONDENSED CONSOLIDATING BALANCE SHEET
	31-Dec-13
	(In thousands)
			Parent			Guarantor			Non-			Eliminations			Consolidated
						Subsidiary			Guarantor
									Subsidiaries
	Assets
	Current assets:
	Cash and cash equivalents		$	246,294		$	84,290		$	640		$	—		$	331,224
	Accounts receivable			74,887			97,128			—			(44	)		171,971
	Fair value of derivative contracts			—			4,549			—			—			4,549
	Current income tax receivable			7,366			—			—			—			7,366
	Deferred taxes *			8,659			23,051			—			—			31,710
Inventory			3,440			283			—			—			3,723
Other current assets			1,874			—			—			—			1,874
Total current assets			342,520			209,301			640			(44	)		552,417
Oil and gas properties, full cost method:
Proved			1,309,527			6,494,590			—			—			7,804,117
Less: accumulated DD&A			(459,932	)		(5,448,828	)		—			—			(5,908,760	)
Net proved oil and gas properties			849,595			1,045,762			—			—			1,895,357
Unevaluated			325,113			388,643			10,583			—			724,339
Other property and equipment, net			26,178			—			—			—			26,178
Fair value of derivative contracts			—			1,378			—			—			1,378
Other assets, net			45,410			1,349			2,128			—			48,887
Investment in subsidiary			747,472			—			12,711			(760,183	)		—
Total assets		$	2,336,288		$	1,646,433		$	26,062		($	760,227	)	$	3,248,556
Liabilities and Stockholders’ Equity
Current liabilities:
Accounts payable to vendors		$	173,147		$	22,530		$	44		($	44	)	$	195,677
Undistributed oil and gas proceeds			34,386			2,643			—			—			37,029
Accrued interest			9,022			—			—			—			9,022
Fair value of derivative contracts			—			7,753			—			—			7,753
Asset retirement obligations			—			67,161			—			—			67,161
Other current liabilities			53,682			838			—			—			54,520
Total current liabilities			270,237			100,925			44			(44	)		371,162
Long-term debt			1,027,084			—			—			—			1,027,084
Deferred taxes *			10,227			380,466			—			—			390,693
Asset retirement obligations			4,945			430,407			—			—			435,352
Fair value of derivative contracts			—			470			—			—			470
Other long-term liabilities			53,509			—			—			—			53,509
Total liabilities			1,366,002			912,268			44			(44	)		2,278,270
Commitments and contingencies
Stockholders’ equity:
Common stock			488			—			—			—			488
Treasury stock			(860	)		—			—			—			(860	)
Additional paid-in capital			1,397,885			1,309,563			27,403			(1,336,966	)		1,397,885
Accumulated deficit			(425,165	)		(574,003	)		(52	)		574,055			(425,165	)
Accumulated other comprehensive loss			(2,062	)		(1,395	)		(1,333	)		2,728			(2,062	)
Total stockholders’ equity			970,286			734,165			26,018			(760,183	)		970,286
Total liabilities and stockholders’ equity		$	2,336,288		$	1,646,433		$	26,062		($	760,227	)	$	3,248,556
*	Deferred income taxes have been allocated to the Guarantor Subsidiary where related oil and gas properties reside.
Condensed Consolidating Statement of Income	'
	CONDENSED CONSOLIDATING STATEMENT OF INCOME
	THREE MONTHS ENDED JUNE 30, 2014
	(In thousands)
			Parent			Guarantor			Non-			Eliminations			Consolidated
						Subsidiary			Guarantor
									Subsidiaries
	Operating revenue:
	Oil production		$	5,854		$	136,539		$	—		$	—		$	142,393
	Gas production			20,800			25,867			—			—			46,667
	Natural gas liquids production			10,219			5,717			—			—			15,936
	Other operational income			1,880			170			—			—			2,050
	Total operating revenue			38,753			168,293			—			—			207,046
	Operating expenses:
	Lease operating expenses			5,046			44,408			—			—			49,454
	Transportation, processing and gathering expenses			10,456			3,642			—			—			14,098
	Production taxes			1,903			1,354			—			—			3,257
	Depreciation, depletion, amortization			30,385			62,450			—			—			92,835
	Accretion expense			61			7,672			—			—			7,733
	Salaries, general and administrative			16,639			—			(2	)		—			16,637
	Incentive compensation expense			3,903			—			—			—			3,903
	Derivative expense, net			—			2,516			—			—			2,516
	Total operating expenses			68,393			122,042			(2	)		—			190,433
	Income (loss) from operations			(29,640	)		46,251			2			—			16,613
	Other (income) expenses:
	Interest expense			9,880			33			—			—			9,913
	Interest income			(146	)		(41	)		(6	)		—			(193	)
	Other income			(192	)		(530	)		—			—			(722	)
	Other expense			179			—			—			—			179
	Income from investment in subsidiaries			(29,947	)		—			(8	)		29,955			—
	Total other (income) expenses			(20,226	)		(538	)		(14	)		29,955			9,177
	Income (loss) before taxes			(9,414	)		46,789			16			(29,955	)		7,436
	Provision (benefit) for income taxes:
	Current			—			—			—			—			—
	Deferred			(13,858	)		16,850			—			—			2,992
	Total income taxes			(13,858	)		16,850			—			—			2,992
	Net income		$	4,444		$	29,939		$	16		($	29,955	)	$	4,444
	Comprehensive income (loss)		($	4,566	)	$	29,939		$	16		($	29,955	)	($	4,566	)
	CONDENSED CONSOLIDATING STATEMENT OF INCOME
	THREE MONTHS ENDED JUNE 30, 2013
	(In thousands)
			Parent			Guarantor			Non-			Eliminations			Consolidated
						Subsidiary			Guarantor
									Subsidiaries
	Operating revenue:
	Oil production		$	8,378		$	176,120		$	—		$	—		$	184,498
	Gas production			20,071			27,761			—			—			47,832
	Natural gas liquids production			6,378			4,822			—			—			11,200
	Other operational income			790			189			—			—			979
	Derivate income, net			—			1,368			—			—			1,368
	Total operating revenue			35,617			210,260			—			—			245,877
	Operating expenses:
	Lease operating expenses			3,425			47,092			—			—			50,517
	Transportation, processing and gathering expenses			5,729			3,167			—			—			8,896
	Production taxes			1,320			2,771			—			—			4,091
	Depreciation, depletion, amortization			25,088			62,121			—			—			87,209
	Accretion expense			93			8,225			—			—			8,318
	Salaries, general and administrative			15,150			—			48			—			15,198
	Incentive compensation expense			2,050			—			—			—			2,050
	Other operational expenses			51			22			—						73
	Total operating expenses			52,906			123,398			48			—			176,352
	Income (loss) from operations			(17,289	)		86,862			(48	)		—			69,525
	Other (income) expenses:
	Interest expense			8,882			13			—			—			8,895
Interest income			(70	)		(38	)		(7	)		—			(115	)
Other income			(217	)		(465	)		—			—			(682	)
(Income) loss from investment in subsidiaries			(55,893	)		—			39			55,854			—
Total other (income) expenses			(47,298	)		(490	)		32			55,854			8,098
Income (loss) before taxes			30,009			87,352			(80	)		(55,854	)		61,427
Provision (benefit) for income taxes:
Current			(6,993	)		—			—			—			(6,993	)
Deferred			(2,020	)		31,418			—			—			29,398
Total income taxes			(9,013	)		31,418			—			—			22,405
Net income (loss)		$	39,022		$	55,934		($	80	)	($	55,854	)	$	39,022
Comprehensive income (loss)		$	53,060		$	55,934		($	80	)	($	55,854	)	$	53,060
CONDENSED CONSOLIDATING STATEMENT OF INCOME
SIX MONTHS ENDED JUNE 30, 2014
(In thousands)
		Parent			Guarantor			Non-			Eliminations			Consolidated
					Subsidiary			Guarantor
								Subsidiaries
Operating revenue:
Oil production		$	12,490		$	268,192		$	—		$	—		$	280,682
Gas production			49,639			53,390			—			—			103,029
Natural gas liquids production			28,473			15,433			—			—			43,906
Other operational income			2,704			343			—			—			3,047
Total operating revenue			93,306			337,358			—			—			430,664
Operating expenses:
Lease operating expenses			9,059			87,298			—			—			96,357
Transportation, processing and gathering expenses			20,773			7,951			—			—			28,724
Production taxes			3,584			2,735			—			—			6,319
Depreciation, depletion, amortization			58,440			117,041			—			—			175,481
Accretion expense			129			15,159			—			—			15,288
Salaries, general and administrative			32,964			2			—			—			32,966
Incentive compensation expense			7,037			—			—			—			7,037
Other operational expenses			176			36			—			—			212
Derivative expense, net			—			3,115			—			—			3,115
Total operating expenses			132,162			233,337			—			—			365,499
Income (loss) from operations			(38,856	)		104,021			—			—			65,165
Other (income) expenses:
Interest expense			18,233			37			—			—			18,270
Interest income			(225	)		(99	)		(12	)		—			(336	)
Other income			(373	)		(1,056	)		—			—			(1,429	)
Other expense			179			—			—			—			179
Income from investment in subsidiaries			(67,292	)		—			(12	)		67,304			—
Total other (income) expenses			(49,478	)		(1,118	)		(24	)		67,304			16,684
Income before taxes			10,622			105,139			24			(67,304	)		48,481
Provision (benefit) for income taxes:
Current			—			—			—			—			—
Deferred			(19,765	)		37,859			—			—			18,094
Total income taxes			(19,765	)		37,859			—			—			18,094
Net income		$	30,387		$	67,280		$	24		($	67,304	)	$	30,387
Comprehensive income		$	14,288		$	67,280		$	24		($	67,304	)	$	14,288
CONDENSED CONSOLIDATING STATEMENT OF INCOME
SIX MONTHS ENDED JUNE 30, 2013
(In thousands)
		Parent			Guarantor			Non-			Eliminations			Consolidated
					Subsidiary			Guarantor
								Subsidiaries
Operating revenue:
Oil production		$	13,721		$	357,702		$	—		$	—		$	371,423
Gas production			27,269			57,385			—			—			84,654
Natural gas liquids production			8,677			11,701			—			—			20,378
Other operational income			1,439			347			—			—			1,786
Derivate income, net			—			147			—			—			147
Total operating revenue			51,106			427,282			—			—			478,388
Operating expenses:
Lease operating expenses			5,716			97,845			—			—			103,561
Transportation, processing and gathering expenses			7,781			6,512			—			—			14,293
Production taxes			2,187			3,993			—			—			6,180
Depreciation, depletion, amortization			35,279			127,365			—			—			162,644
Accretion expense			186			16,395			—			—			16,581
Salaries, general and administrative			29,098			4			48			—			29,150
Incentive compensation expense			3,481			—			—			—			3,481
Other operational expenses			101			44			—						145
Total operating expenses			83,829			252,158			48			—			336,035
Income (loss) from operations			(32,723	)		175,124			(48	)		—			142,353
Other (income) expenses:
Interest expense			18,509			21			—			—			18,530
Interest income			(150	)		(75	)		(7	)		—			(232	)
Other income			(441	)		(967	)		—			—			(1,408	)
(Income) loss from investment in subsidiaries			(112,721	)		—			39			112,682			—
Total other (income) expenses			(94,803	)		(1,021	)		32			112,682			16,890
Income (loss) before taxes			62,080			176,145			(80	)		(112,682	)		125,463
Provision (benefit) for income taxes:
Current			(10,739	)		—			—			—			(10,739	)
Deferred			(6,961	)		63,383			—			—			56,422
Total income taxes			(17,700	)		63,383			—			—			45,683
Net income (loss)		$	79,780		$	112,762		($	80	)	($	112,682	)	$	79,780
Comprehensive income (loss)		$	75,477		$	112,762		($	80	)	($	112,682	)	$	75,477
Condensed Consolidating Statement of Cash Flows	'
	CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
	SIX MONTHS ENDED JUNE 30, 2014
	(In thousands)
			Parent			Guarantor			Non-			Eliminations			Consolidated
						Subsidiary			Guarantor
									Subsidiaries
	Cash flows from operating activities:
	Net income		$	30,387		$	67,280		$	24		($	67,304	)	$	30,387
	Adjustments to reconcile net income to net cash provided by operating activities:
	Depreciation, depletion and amortization			58,440			117,041			—			—			175,481
	Accretion expense			129			15,159			—			—			15,288
	Deferred income tax provision (benefit)			(19,765	)		37,859			—			—			18,094
	Settlement of asset retirement obligations			(82	)		(24,833	)		—			—			(24,915	)
	Non-cash stock compensation expense			5,358			—			—			—			5,358
	Non-cash derivative expense			—			2,697			—			—			2,697
	Non-cash interest expense			8,229			—			—			—			8,229
	Change in current income taxes			(6	)		—			—			—			(6	)
	Non-cash income from investment in subsidiaries			(67,292	)		—			(12	)		67,304			—
	Change in intercompany receivables/payables			(126,526	)		114,841			11,685			—			—
	(Increase) decrease in accounts receivable			(42,216	)		16,692			—			—			(25,524	)
	Increase in other current assets			(82	)		—			—			—			(82	)
	Increase (decrease) in accounts payable			2,052			(209	)		—			—			1,843
	Increase in other current liabilities			48,987			1,798			—			—			50,785
	Other			381			(1,056	)		—			—			(675	)
	Net cash (used in) provided by operating activities			(102,006	)		347,269			11,697			—			256,960
	Cash flows from investing activities:
	Investment in oil and gas properties			(121,836	)		(384,349	)		(11,719	)		—			(517,904	)
	Proceeds from sale of oil and gas properties, net of expenses			9,777			42,178			—			—			51,955
	Investment in fixed and other assets			(3,896	)		—			—			—			(3,896	)
	Change in restricted funds			—			—			(356	)		—			(356	)
	Investment in subsidiaries			—			—			(12,176	)		12,176			—
	Net cash used in investing activities			(115,955	)		(342,171	)		(24,251	)		12,176			(470,201	)
	Cash flows from financing activities:
	Net proceeds from issuance of common stock			226,036			—			—			—			226,036
	Deferred financing costs			(3,167	)		—			—			—			(3,167	)
	Equity proceeds from parent			—			—			12,176			(12,176	)		—
	Net payments for share-based compensation			(6,948	)		—			—			—			(6,948	)
	Net cash provided by financing activities			215,921			—			12,176			(12,176	)		215,921
	Effect of exchange rate changes on cash			—			—			(18	)		—			(18	)
	Net change in cash and cash equivalents			(2,040	)		5,098			(396	)		—			2,662
	Cash and cash equivalents, beginning of period			246,294			84,290			640			—			331,224
	Cash and cash equivalents, end of period		$	244,254		$	89,388		$	244		$	—		$	333,886
	CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
	SIX MONTHS ENDED JUNE 30, 2013
	(In thousands)
			Parent			Guarantor			Non-			Eliminations			Consolidated
						Subsidiary			Guarantor
									Subsidiaries
	Cash flows from operating activities:
	Net income (loss)		$	79,780		$	112,762		($	80	)	($	112,682	)	$	79,780
	Adjustments to reconcile net income to net cash provided by operating activities:
	Depreciation, depletion and amortization			35,279			127,365			—			—			162,644
	Accretion expense			186			16,395			—			—			16,581
	Deferred income tax provision (benefit)			(6,961	)		63,383			—			—			56,422
	Settlement of asset retirement obligations			—			(37,335	)		—			—			(37,335	)
	Non-cash stock compensation expense			4,866			—			—			—			4,866
	Excess tax benefits			(104	)		—			—			—			(104	)
	Non-cash derivative expense			—			311			—			—			311
	Non-cash interest expense			8,181			—			—			—			8,181
	Non-cash income (loss) from investment in subsidiaries			(112,722	)		—			40			112,682			—
	Change in current income taxes			(16,399	)		—			—			—			(16,399	)
	Change in intercompany receivables/payables			170,815			(170,859	)		44			—			—
	(Increase) decrease in accounts receivable			(17,365	)		18,503			—			—			1,138
Increase in other current assets			(245	)		—			—			—			(245	)
Decrease in inventory			158			—			—			—			158
Increase in accounts payable			4,507			2,086			—			—			6,593
Increase (decrease) in other current liabilities			(5,258	)		2,088			—			—			(3,170	)
Other			(2,482	)		(966	)		—			—			(3,448	)
Net cash provided by operating activities			142,236			133,733			4			—			275,973
Cash flows from investing activities:
Investment in oil and gas properties			(176,896	)		(133,659	)		(9,663	)		—			(320,218	)
Investment in fixed and other assets			(1,711	)		—			—			—			(1,711	)
Change in restricted funds			—			—			(3,515	)		—			(3,515	)
Investment in subsidiaries			(14,000	)		—			(13,404	)		27,404			—
Net cash used in investing activities			(192,607	)		(133,659	)		(26,582	)		27,404			(325,444	)
Cash flows from financing activities:
Deferred financing costs			(11	)		—			—			—			(11	)
Excess tax benefits			104			—			—			—			104
Equity proceeds from parent			—			—			27,404			(27,404	)		—
Net payments for share based compensation			(3,590	)		—			—			—			(3,590	)
Net cash (used in) provided by financing activities			(3,497	)		—			27,404			(27,404	)		(3,497	)
Effect of exchange rate on cash			—			—			(186	)		—			(186	)
Net change in cash and cash equivalents			(53,868	)		74			640			—			(53,154	)
Cash and cash equivalents, beginning of period			228,398			51,128			—			—			279,526
Cash and cash equivalents, end of period		$	174,530		$	51,202		$	640		$	—		$	226,372

Earnings_Per_Share_Calculation

Earnings Per Share - Calculation of Basic and Diluted Weighted Average Shares Outstanding and Earnings Per Share (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Basic:	'	'	'	'
Net income	$4,444	$39,022	$30,387	$79,780
Net income attributable to participating securities	-111	-1,015	-698	-1,794
Net income attributable to common stock - basic	4,333	38,007	29,689	77,986
Diluted:	'	'	'	'
Net income	4,444	39,022	30,387	79,780
Net income attributable to participating securities	-111	-1,015	-697	-1,793
Net income attributable to common stock - diluted	$4,333	$38,007	$29,690	$77,987
Weighted average shares (denominator):	'	'	'	'
Weighted average shares - basic	52,050	48,687	50,540	48,653
Dilutive effect of stock options	58	38	54	38
Dilutive effect of convertible notes	265	'	133	'
Weighted average shares - diluted	52,373	48,725	50,727	48,691
Basic earnings per share	$0.08	$0.78	$0.59	$1.60
Diluted earnings per share	$0.08	$0.78	$0.59	$1.60

Earnings_Per_Share_Additional_

Earnings Per Share - Additional Information (Detail)	3 Months Ended		6 Months Ended					1 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	31-May-14
					1.75% Senior Convertible Notes due 2017 [Member]	1.75% Senior Convertible Notes due 2017 [Member]	1.75% Senior Convertible Notes due 2017 [Member]	IPO [Member]
Weighted Average Shares Used In Computing Earnings Per Share [Line Items]	'	'	'	'	'	'	'	'
Antidilutive stock options outstanding	120,000	333,000	131,000	333,000	'	'	'	'
Shares of common stock issued upon vesting of restricted stock	40,000	45,000	372,000	336,000	'	'	'	'
Common stock issued	'	'	'	'	'	'	'	5,750,000
Interest rate	'	'	'	'	1.75%	1.75%	1.75%	'

Common_Stock_Offering_Addition

Common Stock Offering - Additional Information (Detail) (USD $)	6 Months Ended	1 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	31-May-14
		IPO [Member]
Subsidiary, Sale of Stock [Line Items]	'	'
Common stock issued	'	5,750,000
Price of common stock	'	$41
Net proceeds of stock after deducting underwriting discount	$226,036	$226,036

Derivative_Instruments_and_Hed2

Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $)

6 Months Ended

3 Months Ended

5 Months Ended

12 Months Ended

Jun. 30, 2014

Mar. 31, 2014

Dec. 31, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Jun. 30, 2014

Mar. 31, 2014

Dec. 31, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Jun. 30, 2014

Dec. 31, 2014

Dec. 31, 2015

Cash Flow Hedges [Member]

Cash Flow Hedges [Member]

Cash Flow Hedges [Member]

Cash Flow Hedges [Member]

Cash Flow Hedges [Member]

Cash Flow Hedges [Member]

Accumulated other comprehensive loss [Member]

Scenario, Forecast [Member]

Scenario, Forecast [Member]

Natural Gas [Member]

Natural Gas [Member]

Contract

Contract

Derivative Instruments, Gain (Loss) [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum correlation between price of oil & natural gas in market and underlying price basis indicative in the derivative contract

100.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of Contracts no longer qualifying as cash flow hedges

'

'

'

'

'

'

'

'

'

'

'

'

'

3,000,000

2,000,000

Derivative expense

'

'

'

'

'

'

'

'

'

'

'

'

$1,500,000

'

'

Accumulated other comprehensive loss

-18,161,000

-9,200,000

-2,062,000

24,500,000

10,500,000

28,800,000

-17,800,000

-8,000,000

-1,400,000

25,000,000

10,500,000

28,800,000

'

'

'

Accumulated other comprehensive loss, to be reclassified into earnings in the next twelve months

$14,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative_Instruments_and_Hed3

Derivative Instruments and Hedging Activities - Hedging Positions (Detail)	Jun. 30, 2014
	MBbls
Oil [Member] | 2014 Hedging Position One [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	1,000
Swap Price	90.06
Oil [Member] | 2014 Hedging Position Two [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	1,000
Swap Price	90.25
Oil [Member] | 2014 Hedging Position Three [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	1,000
Swap Price	92.25
Oil [Member] | 2014 Hedging Position Four [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	1,000
Swap Price	93.55
Oil [Member] | 2014 Hedging Position Five [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	1,000
Swap Price	94
Oil [Member] | 2014 Hedging Position Six [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	1,000
Swap Price	98
Oil [Member] | 2014 Hedging Position Seven [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	1,000
Swap Price	98.3
Oil [Member] | 2014 Hedging Position Eight [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	2,000
Swap Price	98.85
Oil [Member] | 2014 Hedging Position Nine [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	1,000
Swap Price	99.65
Oil [Member] | 2014 Hedging Position Ten [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	1,000
Swap Price	103.3
Oil [Member] | 2015 Hedging Position One [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	1,000
Swap Price	89
Oil [Member] | 2015 Hedging Position Two [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	1,000
Swap Price	90
Oil [Member] | 2015 Hedging Position Three [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	1,000
Swap Price	90.25
Oil [Member] | 2015 Hedging Position Four [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	1,000
Swap Price	90.4
Oil [Member] | 2015 Hedging Position Five [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	1,000
Swap Price	93.28
Oil [Member] | 2015 Hedging Position Six [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	1,000
Swap Price	93.37
Oil [Member] | Two Thousand Fifteen Hedging Position Seven [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	1,000
Swap Price	94.85
Oil [Member] | Two Thousand Fifteen Hedging Position Eight [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	1,000
Swap Price	95
Natural Gas [Member] | 2014 Hedging Position One [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	10,000
Swap Price	4
Natural Gas [Member] | 2014 Hedging Position Two [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	10,000
Swap Price	4.04
Natural Gas [Member] | 2014 Hedging Position Three [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	10,000
Swap Price	4.105
Natural Gas [Member] | 2014 Hedging Position Four [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	10,000
Swap Price	4.19
Natural Gas [Member] | 2014 Hedging Position Five [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	10,000
Swap Price	4.25
Natural Gas [Member] | 2014 Hedging Position Six [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	10,000
Swap Price	4.25
Natural Gas [Member] | 2014 Hedging Position Seven [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	10,000
Swap Price	4.35
Natural Gas [Member] | 2015 Hedging Position One [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	10,000
Swap Price	4.005
Natural Gas [Member] | 2015 Hedging Position Two [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	10,000
Swap Price	4.12
Natural Gas [Member] | 2015 Hedging Position Three [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	10,000
Swap Price	4.15
Natural Gas [Member] | 2015 Hedging Position Four [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	10,000
Swap Price	4.165
Natural Gas [Member] | 2015 Hedging Position Five [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	10,000
Swap Price	4.22
Natural Gas [Member] | 2015 Hedging Position Six [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	10,000
Swap Price	4.255
Natural Gas [Member] | 2016 Hedging Position One [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	10,000
Swap Price	4.11
Natural Gas [Member] | 2016 Hedging Position Two [Member]	'
Derivatives, Fair Value [Line Items]	'
Daily Volume	10,000
Swap Price	4.12

Derivative_Instruments_and_Hed4

Derivative Instruments and Hedging Activities - Location and Fair Value Amounts of Derivative Instruments Reported in Balance Sheet (Detail) (Commodity Contracts [Member], USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Asset Derivatives	'	'
Fair Value of Derivative Instruments, Assets	$0.40	$5.90
Liability Derivatives	'	'
Fair Value of Derivative Instruments, Liabilities	29.5	8.3
Current Asset [Member]	'	'
Asset Derivatives	'	'
Fair Value of Derivative Instruments, Assets	0	4.5
Long-term assets [Member]	'	'
Asset Derivatives	'	'
Fair Value of Derivative Instruments, Assets	0.4	1.4
Current liabilities [Member]	'	'
Liability Derivatives	'	'
Fair Value of Derivative Instruments, Liabilities	24.2	7.8
Long-term liabilities [Member]	'	'
Liability Derivatives	'	'
Fair Value of Derivative Instruments, Liabilities	$5.30	$0.50

Derivative_Instruments_and_Hed5

Derivative Instruments and Hedging Activities - Before Tax Effect of Derivative Instruments in Statement of Income (Detail) (Cash Flow Hedging [Member], USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion, Net, Total	($26)	$30	($43.40)	$9.90
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total	-9.2	7.3	-16.3	15.9
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net, Total	-1	1.4	-1.6	0.1
Commodity Contracts [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion, Net, Total	-26	30	-43.4	9.9
Derivative income (expense), net [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net, Total	-1	1.4	-1.6	0.1
Operating revenue - oil/gas production [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total	($9.20)	$7.30	($16.30)	$15.90

Derivative_Instruments_and_Hed6

Derivative Instruments and Hedging Activities - Before Tax Effect of Derivative Instruments in Statement of Income (Parenthetical) (Detail) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'	'	'	'
Decrease/increase in oil revenue owing to effective hedging contracts	$6.10	$5.30	$8.60	$9.90
Decrease/increase in gas revenue owing to effective hedging contracts	$3.10	$2	$7.70	$6

Derivative_Instruments_and_Hed7

Derivative Instruments and Hedging Activities - Location and Fair Value Amounts of Derivative Instruments Not Qualifying as Hedging Instruments Reported in Balance Sheet (Detail) (Commodity Contracts [Member], Current liabilities [Member], USD $)	Jun. 30, 2014
In Millions, unless otherwise specified
Commodity Contracts [Member] | Current liabilities [Member]	'
Liability Derivatives	'
Fair Value of Derivative Instruments	$1.50

Derivative_Instruments_and_Hed8

Derivative Instruments and Hedging Activities - Gains or Losses Related to Changes in Fair Value and Cash Settlements on Derivatives Not Qualifying as Hedging Instruments (Detail) (Commodity Contracts [Member], USD $)	3 Months Ended	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2014
Commodity Contracts [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Cash settlements on Derivative Instruments not Qualifying Hedges	$0	$0
Change in fair value on Derivative Instruments not Qualifying Hedges	-1.5	-1.5
Total losses on Derivative Instruments not Qualifying Hedges	($1.50)	($1.50)

Derivative_Instruments_and_Hed9

Derivative Instruments and Hedging Activities - Impact of Rights of Offset Associated with Recognized Assets and Liabilities (Detail) (USD $)	Jun. 30, 2014
In Millions, unless otherwise specified
Current Asset [Member]	'
Derivative Instruments And Hedging Activities [Line Items]	'
Fair Value of Derivative Instruments, Assets Without Netting	$0
Long-term assets [Member]	'
Derivative Instruments And Hedging Activities [Line Items]	'
Fair Value of Derivative Instruments, Assets With Effects of Netting	0.4
Fair Value of Derivative Instruments, Assets Effect of Netting	0.4
Fair Value of Derivative Instruments, Assets Without Netting	0
Current liabilities [Member]	'
Derivative Instruments And Hedging Activities [Line Items]	'
Fair Value of Derivative Instruments, Liabilities With Effects of Netting	-25.7
Fair Value of Derivative Instruments, Liabilities Without Netting	-25.7
Long-term liabilities [Member]	'
Derivative Instruments And Hedging Activities [Line Items]	'
Fair Value of Derivative Instruments, Liabilities With Effects of Netting	-5.3
Fair Value of Derivative Instruments, Liabilities Effect of Netting	0.4
Fair Value of Derivative Instruments, Liabilities Without Netting	($4.90)

LongTerm_Debt_LongTerm_Debt_De

Long-Term Debt - Long-Term Debt (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Instrument [Line Items]	'	'
Long-term debt	$1,033,931	$1,027,084
1.75% Senior Convertible Notes due 2017 [Member]	'	'
Debt Instrument [Line Items]	'	'
Long-term debt	258,900	252,100
7.5% Senior Notes due 2022 [Member]	'	'
Debt Instrument [Line Items]	'	'
Long-term debt	775,000	775,000
Bank debt [Member]	'	'
Debt Instrument [Line Items]	'	'
Long-term debt	$0	'

LongTerm_Debt_LongTerm_Debt_Pa

Long-Term Debt - Long-Term Debt (Parenthetical) (Detail)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
1.75% Senior Convertible Notes due 2017 [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Interest rate	1.75%	1.75%	1.75%
7.5% Senior Notes due 2022 [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Interest rate	7.50%	7.50%	'

LongTerm_Debt_Additional_Infor

Long-Term Debt - Additional Information (Detail) (USD $)

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Aug. 05, 2014

Jun. 30, 2014

Jun. 24, 2014

Aug. 05, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Mar. 06, 2012

Letter of Credit [Member]

Minimum [Member]

Maximum [Member]

Subsequent Event [Member]

Bank debt [Member]

Bank debt [Member]

Bank debt [Member]

1.75% Senior Convertible Notes due 2017 [Member]

1.75% Senior Convertible Notes due 2017 [Member]

1.75% Senior Convertible Notes due 2017 [Member]

1.75% Senior Convertible Notes due 2017 [Member]

Letter of Credit [Member]

Subsequent Event [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit facility initial date

'

'

'

'

'

'

24-Jun-14

'

'

'

'

'

'

Redetermined base borrowing and credit facility

'

'

'

'

'

'

'

$900,000,000

'

'

'

'

'

Maturity of new credit facility if note issue under 2004 indenture are retired on or before April 15, 2014

'

'

'

'

'

'

1-Jul-19

'

'

'

'

'

'

Initial bank and availability under facility

'

'

'

'

'

'

479,000,000

500,000,000

479,000,000

'

'

'

'

Additional borrowing from the previous base

'

'

'

'

'

'

'

400,000,000

'

'

'

'

'

Outstanding borrowing under bank credit facility

'

'

21,000,000

'

'

21,000,000

0

'

0

'

'

'

'

Oil and gas reserve as proportion of discounted present value of future net cash flow, for mortgage

'

'

'

'

'

'

'80

'

'

'

'

'

'

Percentage of borrowing base utilization

'

'

'

1.50%

2.50%

'

'

'

'

'

'

'

'

Aggregate principal amount of Senior Subordinated Notes

'

'

'

'

'

'

'

'

'

'

'

'

300,000,000

Initial conversion rate of convertible note 2017

'

'

'

'

'

'

'

'

'

'

'An initial conversion rate of 23.4449 shares of our common stock per $1,000 principal amount of 2017 Convertible Notes,

'

'

Initial conversion rate of common stock

'

'

'

'

'

'

'

'

'

'

0.0234449

'

'

Principal amount of 2017 convertible notes

'

'

'

'

'

'

'

'

'

$1,000

$1,000

'

'

Initial conversion price of convertible note 2017

'

'

'

'

'

'

'

'

'

'

$42.65

'

'

Closing share price

'

'

'

'

'

'

'

'

'

'

$46.79

'

'

Payment for call option

'

'

'

'

'

'

'

'

'

'

70,800,000

'

'

Anti-dilution adjustments for purchases of call option

'

'

'

'

'

'

'

'

'

'

7,033,470

'

'

Strike price per share

'

'

'

'

'

'

'

'

'

'

$55.91

'

'

Proceeds from sale of warrants

'

'

'

'

'

'

'

'

'

'

40,100,000

'

'

Liability component of convertible note

1,033,931,000

1,027,084,000

'

'

'

'

0

'

'

258,900,000

258,900,000

252,100,000

'

Interest expense related to amortization of discount

'

'

'

'

'

'

'

'

'

3,500,000

6,800,000

'

'

Amortization of deferred financing costs

'

'

'

'

'

'

'

'

'

300,000

600,000

'

'

Interest expense related to contractual interest coupon of convertible notes

'

'

'

'

'

'

'

'

'

$1,300,000

$2,600,000

'

'

Asset_Retirement_Obligations_C

Asset Retirement Obligations - Changes in Asset Retirement Obligations (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Asset Retirement Obligation Disclosure [Abstract]	'	'	'	'
Asset retirement obligations as of the beginning of the period, including current portion	'	'	$502,500,000	'
Liabilities incurred	'	'	25,700,000	'
Liabilities settled	'	'	-24,900,000	'
Divestment of properties	'	'	-10,400,000	'
Accretion expense	7,733,000	8,318,000	15,288,000	16,581,000
Asset retirement obligations as of the end of the period, including current portion	$508,200,000	'	$508,200,000	'

Divestitures_Additional_Inform

Divestitures - Additional Information (Detail) (USD $)	6 Months Ended	0 Months Ended	1 Months Ended
	Jun. 30, 2014	Jan. 16, 2014	Jan. 31, 2014
		Cut Off and Clovelly Fields [Member]	Hatch Point Field [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'	'
Sale of interest cash consideration	$51,955,000	$44,800,000	$9,700,000
Estimates asset retirement obligations	'	9,200,000	1,200,000
Gain or loss recognized from the sale of interest	'	'	$0

Fair_Value_Measurements_Assets

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Marketable securities (Other Assets)	$8.70	$8.20
Assets, Fair Value, Total	9.1	14.1
Liabilities, Fair Value, Total	31	8.3
Derivative contracts [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Derivative Assets, Fair Value	0.4	5.9
Derivative Liabilities, Fair Value	31	8.3
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Marketable securities (Other Assets)	8.7	8.2
Assets, Fair Value, Total	8.7	8.2
Liabilities, Fair Value, Total	0	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Derivative contracts [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Derivative Assets, Fair Value	0	'
Derivative Liabilities, Fair Value	0	'
Significant Other Observable Inputs (Level 2) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Marketable securities (Other Assets)	0	'
Assets, Fair Value, Total	0.4	5.9
Liabilities, Fair Value, Total	31	8.3
Significant Other Observable Inputs (Level 2) [Member] | Derivative contracts [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Derivative Assets, Fair Value	0.4	5.9
Derivative Liabilities, Fair Value	31	8.3
Significant Unobservable Inputs (Level 3) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Marketable securities (Other Assets)	0	'
Assets, Fair Value, Total	0	'
Liabilities, Fair Value, Total	0	'
Significant Unobservable Inputs (Level 3) [Member] | Derivative contracts [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Derivative Assets, Fair Value	0	'
Derivative Liabilities, Fair Value	$0	'

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Convertible Notes Due 2017 [Member]	'	'
Debt Instrument [Line Items]	'	'
Fair value of Convertible Notes	$276.10	$260.40
7.5% Senior Notes due 2022 [Member]	'	'
Debt Instrument [Line Items]	'	'
Fair value of Notes	$854.40	$814.70

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Loss) - Schedule of Changes In Accumulated Other Comprehensive Income Loss (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning balance, net of tax	($9,200,000)	$10,500,000	($2,062,000)	$28,800,000
Other comprehensive income (loss) before reclassifications:	'	'	'	'
Change in fair value of derivatives	-26,000,000	30,000,000	-43,400,000	9,900,000
Foreign currency translations	800,000	-500,000	300,000	-500,000
Income tax effect	9,400,000	-10,800,000	15,700,000	-3,500,000
Net of tax	-15,800,000	18,700,000	-27,400,000	5,900,000
Amounts reclassified from accumulated other comprehensive income:	'	'	'	'
Net of tax	-6,800,000	4,700,000	-11,300,000	10,200,000
Other comprehensive income (loss), net of tax	-9,000,000	14,000,000	-16,100,000	-4,300,000
Ending balance, net of tax	-18,161,000	24,500,000	-18,161,000	24,500,000
Reclassification out of Accumulated Other Comprehensive Income [Member]	'	'	'	'
Amounts reclassified from accumulated other comprehensive income:	'	'	'	'
Operating revenue: oil/gas production	-9,200,000	7,300,000	-16,300,000	15,900,000
Derivative expense, net	-1,500,000	'	-1,500,000	'
Income tax effect	3,900,000	-2,600,000	6,500,000	-5,700,000
Cash Flow Hedges [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning balance, net of tax	-8,000,000	10,500,000	-1,400,000	28,800,000
Other comprehensive income (loss) before reclassifications:	'	'	'	'
Change in fair value of derivatives	-26,000,000	30,000,000	-43,400,000	9,900,000
Income tax effect	9,400,000	-10,800,000	15,700,000	-3,500,000
Net of tax	-16,600,000	19,200,000	-27,700,000	6,400,000
Amounts reclassified from accumulated other comprehensive income:	'	'	'	'
Net of tax	-6,800,000	4,700,000	-11,300,000	10,200,000
Other comprehensive income (loss), net of tax	-9,800,000	14,500,000	-16,400,000	-3,800,000
Ending balance, net of tax	-17,800,000	25,000,000	-17,800,000	25,000,000
Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]	'	'	'	'
Amounts reclassified from accumulated other comprehensive income:	'	'	'	'
Operating revenue: oil/gas production	-9,200,000	7,300,000	-16,300,000	15,900,000
Derivative expense, net	-1,500,000	'	-1,500,000	'
Income tax effect	3,900,000	-2,600,000	6,500,000	-5,700,000
Foreign Currency Items [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning balance, net of tax	-1,200,000	'	-700,000	'
Other comprehensive income (loss) before reclassifications:	'	'	'	'
Foreign currency translations	800,000	-500,000	300,000	-500,000
Net of tax	800,000	-500,000	300,000	-500,000
Amounts reclassified from accumulated other comprehensive income:	'	'	'	'
Other comprehensive income (loss), net of tax	800,000	-500,000	300,000	-500,000
Ending balance, net of tax	($400,000)	($500,000)	($400,000)	($500,000)

Investment_in_Oil_and_Gas_Prop1

Investment in Oil and Gas Properties - Additional Information (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Oil and Gas In Process Activities [Line Items]	'	'
Capital expenditures related to oil and gas property investments	$554,201	$724,339
Canada [Member]	'	'
Oil and Gas In Process Activities [Line Items]	'	'
Capital expenditures related to oil and gas property investments	$14,700	$10,600

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (USD $)	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014
	acre
Commitments And Contingencies Disclosure [Abstract]	'
Legal settlement	$18.40
Net mineral acres	33,000

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail) (USD $)	12 Months Ended	1 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Jul. 31, 2014
		Subsequent Event [Member]
		GOM Conventional Shelf [Member]
Subsequent Event [Line Items]	'	'
Cash consideration received on sale of interest	'	$177.60
Percentage of estimated proved oil and natural gas reserves	9.00%	'

Guarantor_Financial_Statements2

Guarantor Financial Statements - Condensed Consolidating Balance Sheet (Detail) (USD $)	Jun. 30, 2014		Mar. 31, 2014	Dec. 31, 2013		Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets:	'		'	'		'	'	'
Cash and cash equivalents	$333,886		'	$331,224		$226,372	'	$279,526
Accounts receivable	197,495		'	171,971		'	'	'
Fair value of derivative contracts	'		'	4,549		'	'	'
Current income tax receivable	7,372		'	7,366		'	'	'
Deferred taxes	36,308	[1]	'	31,710	[1]	'	'	'
Inventory	3,723		'	3,723		'	'	'
Other current assets	1,955		'	1,874		'	'	'
Total current assets	580,739		'	552,417		'	'	'
Oil and gas properties, full cost method:	'		'	'		'	'	'
Proved	8,520,195		'	7,804,117		'	'	'
Less: accumulated DD&A	-6,144,815		'	-5,908,760		'	'	'
Net proved oil and gas properties	2,375,380		'	1,895,357		'	'	'
Unevaluated	554,201		'	724,339		'	'	'
Other property and equipment, net	28,302		'	26,178		'	'	'
Fair value of derivative contracts	415		'	1,378		'	'	'
Other assets, net	43,015		'	48,887		'	'	'
Total assets	3,582,052		'	3,248,556		'	'	'
Current liabilities:	'		'	'		'	'	'
Accounts payable to vendors	193,900		'	195,677		'	'	'
Undistributed oil and gas proceeds	62,927		'	37,029		'	'	'
Accrued interest	9,025		'	9,022		'	'	'
Fair value of derivative contracts	25,711		'	7,753		'	'	'
Asset retirement obligations	77,132		'	67,161		'	'	'
Other current liabilities	79,539		'	54,520		'	'	'
Total current liabilities	448,234		'	371,162		'	'	'
Long-term debt	1,033,931		'	1,027,084		'	'	'
Deferred taxes	404,188	[1]	'	390,693	[1]	'	'	'
Asset retirement obligations	431,060		'	435,352		'	'	'
Fair value of derivative contracts	5,251		'	470		'	'	'
Other long-term liabilities	47,843		'	53,509		'	'	'
Total liabilities	2,370,507		'	2,278,270		'	'	'
Commitments and contingencies	'		'	'		'	'	'
Stockholders' equity:	'		'	'		'	'	'
Common stock	549		'	488		'	'	'
Treasury stock	-860		'	-860		'	'	'
Additional paid-in capital	1,624,795		'	1,397,885		'	'	'
Accumulated deficit	-394,778		'	-425,165		'	'	'
Accumulated other comprehensive loss	-18,161		-9,200	-2,062		24,500	10,500	28,800
Total stockholders' equity	1,211,545		'	970,286		'	'	'
Total liabilities and stockholders' equity	3,582,052		'	3,248,556		'	'	'
Parent [Member]	'		'	'		'	'	'
Current assets:	'		'	'		'	'	'
Cash and cash equivalents	244,254		'	246,294		174,530	'	228,398
Accounts receivable	153,316		'	74,887		'	'	'
Current income tax receivable	7,372		'	7,366		'	'	'
Deferred taxes	1,565	[1]	'	8,659	[1]	'	'	'
Inventory	3,440		'	3,440		'	'	'
Other current assets	1,955		'	1,874		'	'	'
Total current assets	411,902		'	342,520		'	'	'
Oil and gas properties, full cost method:	'		'	'		'	'	'
Proved	1,475,522		'	1,309,527		'	'	'
Less: accumulated DD&A	-527,605		'	-459,932		'	'	'
Net proved oil and gas properties	947,917		'	849,595		'	'	'
Unevaluated	302,396		'	325,113		'	'	'
Other property and equipment, net	28,302		'	26,178		'	'	'
Other assets, net	30,734		'	45,410		'	'	'
Investment in subsidiary	798,664		'	747,472		'	'	'
Total assets	2,519,915		'	2,336,288		'	'	'
Current liabilities:	'		'	'		'	'	'
Accounts payable to vendors	93,251		'	173,147		'	'	'
Undistributed oil and gas proceeds	60,724		'	34,386		'	'	'
Accrued interest	9,025		'	9,022		'	'	'
Other current liabilities	76,461		'	53,682		'	'	'
Total current liabilities	239,461		'	270,237		'	'	'
Long-term debt	1,033,931		'	1,027,084		'	'	'
Deferred taxes	-16,629	[1]	'	10,227	[1]	'	'	'
Asset retirement obligations	3,764		'	4,945		'	'	'
Other long-term liabilities	47,843		'	53,509		'	'	'
Total liabilities	1,308,370		'	1,366,002		'	'	'
Commitments and contingencies	'		'	'		'	'	'
Stockholders' equity:	'		'	'		'	'	'
Common stock	549		'	488		'	'	'
Treasury stock	-860		'	-860		'	'	'
Additional paid-in capital	1,624,795		'	1,397,885		'	'	'
Accumulated deficit	-394,778		'	-425,165		'	'	'
Accumulated other comprehensive loss	-18,161		'	-2,062		'	'	'
Total stockholders' equity	1,211,545		'	970,286		'	'	'
Total liabilities and stockholders' equity	2,519,915		'	2,336,288		'	'	'
Guarantor Subsidiary [Member]	'		'	'		'	'	'
Current assets:	'		'	'		'	'	'
Cash and cash equivalents	89,388		'	84,290		51,202	'	51,128
Accounts receivable	80,436		'	97,128		'	'	'
Fair value of derivative contracts	'		'	4,549		'	'	'
Deferred taxes	34,743	[1]	'	23,051	[1]	'	'	'
Inventory	283		'	283		'	'	'
Total current assets	204,850		'	209,301		'	'	'
Oil and gas properties, full cost method:	'		'	'		'	'	'
Proved	7,044,673		'	6,494,590		'	'	'
Less: accumulated DD&A	-5,617,210		'	-5,448,828		'	'	'
Net proved oil and gas properties	1,427,463		'	1,045,762		'	'	'
Unevaluated	237,146		'	388,643		'	'	'
Fair value of derivative contracts	415		'	1,378		'	'	'
Other assets, net	1,880		'	1,349		'	'	'
Total assets	1,871,754		'	1,646,433		'	'	'
Current liabilities:	'		'	'		'	'	'
Accounts payable to vendors	125,177		'	22,530		'	'	'
Undistributed oil and gas proceeds	2,203		'	2,643		'	'	'
Fair value of derivative contracts	25,711		'	7,753		'	'	'
Asset retirement obligations	77,132		'	67,161		'	'	'
Other current liabilities	3,078		'	838		'	'	'
Total current liabilities	233,301		'	100,925		'	'	'
Deferred taxes	420,817	[1]	'	380,466	[1]	'	'	'
Asset retirement obligations	427,296		'	430,407		'	'	'
Fair value of derivative contracts	5,251		'	470		'	'	'
Total liabilities	1,086,665		'	912,268		'	'	'
Commitments and contingencies	'		'	'		'	'	'
Stockholders' equity:	'		'	'		'	'	'
Additional paid-in capital	1,309,562		'	1,309,563		'	'	'
Accumulated deficit	-506,723		'	-574,003		'	'	'
Accumulated other comprehensive loss	-17,750		'	-1,395		'	'	'
Total stockholders' equity	785,089		'	734,165		'	'	'
Total liabilities and stockholders' equity	1,871,754		'	1,646,433		'	'	'
Non-Guarantor Subsidiaries [Member]	'		'	'		'	'	'
Current assets:	'		'	'		'	'	'
Cash and cash equivalents	244		'	640		640	'	'
Total current assets	244		'	640		'	'	'
Oil and gas properties, full cost method:	'		'	'		'	'	'
Unevaluated	14,659		'	10,583		'	'	'
Other assets, net	10,401		'	2,128		'	'	'
Investment in subsidiary	25,156		'	12,711		'	'	'
Total assets	50,460		'	26,062		'	'	'
Current liabilities:	'		'	'		'	'	'
Accounts payable to vendors	11,729		'	44		'	'	'
Total current liabilities	11,729		'	44		'	'	'
Total liabilities	11,729		'	44		'	'	'
Commitments and contingencies	'		'	'		'	'	'
Stockholders' equity:	'		'	'		'	'	'
Additional paid-in capital	39,580		'	27,403		'	'	'
Accumulated deficit	-28		'	-52		'	'	'
Accumulated other comprehensive loss	-821		'	-1,333		'	'	'
Total stockholders' equity	38,731		'	26,018		'	'	'
Total liabilities and stockholders' equity	50,460		'	26,062		'	'	'
Consolidation, Eliminations [Member]	'		'	'		'	'	'
Current assets:	'		'	'		'	'	'
Accounts receivable	-36,257		'	-44		'	'	'
Total current assets	-36,257		'	-44		'	'	'
Oil and gas properties, full cost method:	'		'	'		'	'	'
Investment in subsidiary	-823,820		'	-760,183		'	'	'
Total assets	-860,077		'	-760,227		'	'	'
Current liabilities:	'		'	'		'	'	'
Accounts payable to vendors	-36,257		'	-44		'	'	'
Total current liabilities	-36,257		'	-44		'	'	'
Total liabilities	-36,257		'	-44		'	'	'
Commitments and contingencies	'		'	'		'	'	'
Stockholders' equity:	'		'	'		'	'	'
Additional paid-in capital	-1,349,142		'	-1,336,966		'	'	'
Accumulated deficit	506,751		'	574,055		'	'	'
Accumulated other comprehensive loss	18,571		'	2,728		'	'	'
Total stockholders' equity	-823,820		'	-760,183		'	'	'
Total liabilities and stockholders' equity	($860,077)		'	($760,227)		'	'	'
[1]	Deferred income taxes have been allocated to the Guarantor Subsidiary where related oil and gas properties reside.

Guarantor_Financial_Statements3

Guarantor Financial Statements - Condensed Consolidating Statement of Income (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Operating revenue:	'	'	'	'
Oil production	$142,393	$184,498	$280,682	$371,423
Gas production	46,667	47,832	103,029	84,654
Natural gas liquids production	15,936	11,200	43,906	20,378
Other operational income	2,050	979	3,047	1,786
Derivate income, net	'	1,368	'	147
Total operating revenue	207,046	245,877	430,664	478,388
Operating expenses:	'	'	'	'
Lease operating expenses	49,454	50,517	96,357	103,561
Transportation, processing and gathering expenses	14,098	8,896	28,724	14,293
Production taxes	3,257	4,091	6,319	6,180
Depreciation, depletion, amortization	92,835	87,209	175,481	162,644
Accretion expense	7,733	8,318	15,288	16,581
Salaries, general and administrative	16,637	15,198	32,966	29,150
Incentive compensation expense	3,903	2,050	7,037	3,481
Other operational expenses	'	73	212	145
Derivative expense, net	2,516	'	3,115	'
Total operating expenses	190,433	176,352	365,499	336,035
Income (loss) from operations	16,613	69,525	65,165	142,353
Other (income) expenses:	'	'	'	'
Interest expense	9,913	8,895	18,270	18,530
Interest income	-193	-115	-336	-232
Other income	-722	-682	-1,429	-1,408
Other expense	179	'	179	'
Total other (income) expenses	9,177	8,098	16,684	16,890
Income (loss) before taxes	7,436	61,427	48,481	125,463
Provision (benefit) for income taxes:	'	'	'	'
Current	'	-6,993	'	-10,739
Deferred	2,992	29,398	18,094	56,422
Total income taxes	2,992	22,405	18,094	45,683
Net income	4,444	39,022	30,387	79,780
Comprehensive income	-4,566	53,060	14,288	75,477
Parent [Member]	'	'	'	'
Operating revenue:	'	'	'	'
Oil production	5,854	8,378	12,490	13,721
Gas production	20,800	20,071	49,639	27,269
Natural gas liquids production	10,219	6,378	28,473	8,677
Other operational income	1,880	790	2,704	1,439
Total operating revenue	38,753	35,617	93,306	51,106
Operating expenses:	'	'	'	'
Lease operating expenses	5,046	3,425	9,059	5,716
Transportation, processing and gathering expenses	10,456	5,729	20,773	7,781
Production taxes	1,903	1,320	3,584	2,187
Depreciation, depletion, amortization	30,385	25,088	58,440	35,279
Accretion expense	61	93	129	186
Salaries, general and administrative	16,639	15,150	32,964	29,098
Incentive compensation expense	3,903	2,050	7,037	3,481
Other operational expenses	'	51	176	101
Total operating expenses	68,393	52,906	132,162	83,829
Income (loss) from operations	-29,640	-17,289	-38,856	-32,723
Other (income) expenses:	'	'	'	'
Interest expense	9,880	8,882	18,233	18,509
Interest income	-146	-70	-225	-150
Other income	-192	-217	-373	-441
Other expense	179	'	179	'
(Income) loss from investment in subsidiaries	-29,947	-55,893	-67,292	-112,721
Total other (income) expenses	-20,226	-47,298	-49,478	-94,803
Income (loss) before taxes	-9,414	30,009	10,622	62,080
Provision (benefit) for income taxes:	'	'	'	'
Current	'	-6,993	'	-10,739
Deferred	-13,858	-2,020	-19,765	-6,961
Total income taxes	-13,858	-9,013	-19,765	-17,700
Net income	4,444	39,022	30,387	79,780
Comprehensive income	-4,566	53,060	14,288	75,477
Guarantor Subsidiary [Member]	'	'	'	'
Operating revenue:	'	'	'	'
Oil production	136,539	176,120	268,192	357,702
Gas production	25,867	27,761	53,390	57,385
Natural gas liquids production	5,717	4,822	15,433	11,701
Other operational income	170	189	343	347
Derivate income, net	'	1,368	'	147
Total operating revenue	168,293	210,260	337,358	427,282
Operating expenses:	'	'	'	'
Lease operating expenses	44,408	47,092	87,298	97,845
Transportation, processing and gathering expenses	3,642	3,167	7,951	6,512
Production taxes	1,354	2,771	2,735	3,993
Depreciation, depletion, amortization	62,450	62,121	117,041	127,365
Accretion expense	7,672	8,225	15,159	16,395
Salaries, general and administrative	'	'	2	4
Other operational expenses	'	22	36	44
Derivative expense, net	2,516	'	3,115	'
Total operating expenses	122,042	123,398	233,337	252,158
Income (loss) from operations	46,251	86,862	104,021	175,124
Other (income) expenses:	'	'	'	'
Interest expense	33	13	37	21
Interest income	-41	-38	-99	-75
Other income	-530	-465	-1,056	-967
Total other (income) expenses	-538	-490	-1,118	-1,021
Income (loss) before taxes	46,789	87,352	105,139	176,145
Provision (benefit) for income taxes:	'	'	'	'
Deferred	16,850	31,418	37,859	63,383
Total income taxes	16,850	31,418	37,859	63,383
Net income	29,939	55,934	67,280	112,762
Comprehensive income	29,939	55,934	67,280	112,762
Non-Guarantor Subsidiaries [Member]	'	'	'	'
Operating expenses:	'	'	'	'
Salaries, general and administrative	-2	48	'	48
Total operating expenses	-2	48	'	48
Income (loss) from operations	2	-48	'	-48
Other (income) expenses:	'	'	'	'
Interest income	-6	-7	-12	-7
(Income) loss from investment in subsidiaries	-8	39	-12	39
Total other (income) expenses	-14	32	-24	32
Income (loss) before taxes	16	-80	24	-80
Provision (benefit) for income taxes:	'	'	'	'
Net income	16	-80	24	-80
Comprehensive income	16	-80	24	-80
Consolidation, Eliminations [Member]	'	'	'	'
Other (income) expenses:	'	'	'	'
(Income) loss from investment in subsidiaries	29,955	55,854	67,304	112,682
Total other (income) expenses	29,955	55,854	67,304	112,682
Income (loss) before taxes	-29,955	-55,854	-67,304	-112,682
Provision (benefit) for income taxes:	'	'	'	'
Net income	-29,955	-55,854	-67,304	-112,682
Comprehensive income	($29,955)	($55,854)	($67,304)	($112,682)

Guarantor_Financial_Statements4

Guarantor Financial Statements - Condensed Consolidating Statement of Cash Flows (Detail) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:	'	'
Net income	$30,387	$79,780
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation, depletion and amortization	175,481	162,644
Accretion expense	15,288	16,581
Deferred income tax provision (benefit)	18,094	56,422
Settlement of asset retirement obligations	-24,915	-37,335
Non-cash stock compensation expense	5,358	4,866
Excess tax benefits	'	-104
Non-cash derivative expense	2,697	311
Non-cash interest expense	8,229	8,181
Change in current income taxes	-6	-16,399
(Increase) decrease in accounts receivable	-25,524	1,138
Increase in other current assets	-82	-245
(Increase) decrease in inventory	'	158
Increase (decrease) in accounts payable	1,843	6,593
Increase (decrease) in other current liabilities	50,785	-3,170
Other	-675	-3,448
Net cash (used in) provided by operating activities	256,960	275,973
Cash flows from investing activities:	'	'
Investment in oil and gas properties	-517,904	-320,218
Proceeds from sale of oil and gas properties, net of expenses	51,955	'
Investment in fixed and other assets	-3,896	-1,711
Change in restricted funds	-356	-3,515
Net cash used in investing activities	-470,201	-325,444
Cash flows from financing activities:	'	'
Net proceeds from issuance of common stock	226,036	'
Deferred financing costs	-3,167	-11
Excess tax benefits	'	104
Net payments for share-based compensation	-6,948	-3,590
Net cash provided by (used in) financing activities	215,921	-3,497
Effect of exchange rate changes on cash	-18	-186
Net change in cash and cash equivalents	2,662	-53,154
Cash and cash equivalents, beginning of period	331,224	279,526
Cash and cash equivalents, end of period	333,886	226,372
Parent [Member]	'	'
Cash flows from operating activities:	'	'
Net income	30,387	79,780
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation, depletion and amortization	58,440	35,279
Accretion expense	129	186
Deferred income tax provision (benefit)	-19,765	-6,961
Settlement of asset retirement obligations	-82	'
Non-cash stock compensation expense	5,358	4,866
Excess tax benefits	'	-104
Non-cash interest expense	8,229	8,181
Non-cash income (loss) from investment in subsidiaries	-67,292	-112,722
Change in current income taxes	-6	-16,399
Change in intercompany receivables/payables	-126,526	170,815
(Increase) decrease in accounts receivable	-42,216	-17,365
Increase in other current assets	-82	-245
(Increase) decrease in inventory	'	158
Increase (decrease) in accounts payable	2,052	4,507
Increase (decrease) in other current liabilities	48,987	-5,258
Other	381	-2,482
Net cash (used in) provided by operating activities	-102,006	142,236
Cash flows from investing activities:	'	'
Investment in oil and gas properties	-121,836	-176,896
Proceeds from sale of oil and gas properties, net of expenses	9,777	'
Investment in fixed and other assets	-3,896	-1,711
Investment in subsidiaries	'	-14,000
Net cash used in investing activities	-115,955	-192,607
Cash flows from financing activities:	'	'
Net proceeds from issuance of common stock	226,036	'
Deferred financing costs	-3,167	-11
Excess tax benefits	'	104
Net payments for share-based compensation	-6,948	-3,590
Net cash provided by (used in) financing activities	215,921	-3,497
Net change in cash and cash equivalents	-2,040	-53,868
Cash and cash equivalents, beginning of period	246,294	228,398
Cash and cash equivalents, end of period	244,254	174,530
Guarantor Subsidiary [Member]	'	'
Cash flows from operating activities:	'	'
Net income	67,280	112,762
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation, depletion and amortization	117,041	127,365
Accretion expense	15,159	16,395
Deferred income tax provision (benefit)	37,859	63,383
Settlement of asset retirement obligations	-24,833	-37,335
Non-cash derivative expense	2,697	311
Change in intercompany receivables/payables	114,841	-170,859
(Increase) decrease in accounts receivable	16,692	18,503
Increase (decrease) in accounts payable	-209	2,086
Increase (decrease) in other current liabilities	1,798	2,088
Other	-1,056	-966
Net cash (used in) provided by operating activities	347,269	133,733
Cash flows from investing activities:	'	'
Investment in oil and gas properties	-384,349	-133,659
Proceeds from sale of oil and gas properties, net of expenses	42,178	'
Net cash used in investing activities	-342,171	-133,659
Cash flows from financing activities:	'	'
Net change in cash and cash equivalents	5,098	74
Cash and cash equivalents, beginning of period	84,290	51,128
Cash and cash equivalents, end of period	89,388	51,202
Non-Guarantor Subsidiaries [Member]	'	'
Cash flows from operating activities:	'	'
Net income	24	-80
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Non-cash income (loss) from investment in subsidiaries	-12	40
Change in intercompany receivables/payables	11,685	44
Net cash (used in) provided by operating activities	11,697	4
Cash flows from investing activities:	'	'
Investment in oil and gas properties	-11,719	-9,663
Change in restricted funds	-356	-3,515
Investment in subsidiaries	-12,176	-13,404
Net cash used in investing activities	-24,251	-26,582
Cash flows from financing activities:	'	'
Equity proceeds from parent	12,176	27,404
Net cash provided by (used in) financing activities	12,176	27,404
Effect of exchange rate changes on cash	-18	-186
Net change in cash and cash equivalents	-396	640
Cash and cash equivalents, beginning of period	640	'
Cash and cash equivalents, end of period	244	640
Consolidation, Eliminations [Member]	'	'
Cash flows from operating activities:	'	'
Net income	-67,304	-112,682
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Non-cash income (loss) from investment in subsidiaries	67,304	112,682
Cash flows from investing activities:	'	'
Investment in subsidiaries	12,176	27,404
Net cash used in investing activities	12,176	27,404
Cash flows from financing activities:	'	'
Equity proceeds from parent	-12,176	-27,404
Net cash provided by (used in) financing activities	($12,176)	($27,404)