Ranger Oil (ROCC) 10-Q 11 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	7-May-15
Document Documentand Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Trading Symbol	PVA
Entity Registrant Name	PENN VIRGINIA CORP
Entity Central Index Key	77159
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		71,656,744

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Revenues
Crude oil	$59,168	$105,576
Natural gas liquids (NGLs)	5,396	9,373
Natural gas	8,571	18,203
Gain (Loss) on Disposition of Property Plant Equipment	-91	56,826
Other, net	1,483	-113
Total revenues	74,527	189,865
Operating expenses
Lease operating	11,569	10,116
Gathering, processing and transportation	7,498	3,249
Production and ad valorem taxes	4,689	7,305
General and administrative	11,970	16,688
Exploration	5,887	8,636
Depreciation, depletion and amortization	90,790	72,187
Total operating expenses	132,403	118,181
Operating income (loss)	-57,876	71,684
Other income (expense)
Interest expense	-22,013	-22,534
Derivatives	22,867	-15,662
Other	-2	1
Income (loss) before income taxes	-57,024	33,489
Income tax expense	-141	-14,264
Net income (loss)	-57,165	19,225
Preferred stock dividends	-6,067	-1,722
Net income (loss) attributable to common shareholders	($63,232)	$17,503
Net income (loss) per share:
Basic (in dollars per share)	($0.88)	$0.27
Diluted (in dollars per share)	($0.88)	$0.22
Weighted average shares outstanding – basic	71,820	65,611
Weighted average shares outstanding – diluted	71,820	85,744

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	($57,165)	$19,225
Other comprehensive income (loss):
Change in pension and postretirement obligations, net of tax of $(6) and $13 in 2015 and 2014	-11	25
Total Other Comprehensive Income (Loss), Net of Tax	-11	25
Comprehensive income (loss)	($57,176)	$19,250

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Change in pension and postretirement obligations, net of tax	($6)	$13

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Current assets
Cash and cash equivalents	$3,859	$6,252
Accounts receivable, net of allowance for doubtful accounts	149,929	189,627
Derivative assets	118,409	128,981
Deferred Tax Assets, Net of Valuation Allowance, Current	0	53
Other current assets	9,687	10,114
Total current assets	281,884	335,027
Property and equipment, net (successful efforts method)	1,880,612	1,825,098
Derivative assets	31,844	35,897
Other assets	4,311	4,218
Total assets	2,198,651	2,200,240
Current liabilities
Accounts payable and accrued liabilities	245,066	312,227
Derivative liabilities	0	0
Total current liabilities	245,066	312,227
Other liabilities	123,524	123,886
Deferred income taxes	4,587	4,504
Long-term debt, net of unamortized issuance costs	1,211,910	1,083,806
Commitments and contingencies (Note 12)
Shareholders’ equity:
Preferred stock of $100 par value – 100,000 shares authorized; Series A – 7,945 shares issued as of March 31, 2015 and December 31, 2014 and Series B – 32,500 shares issued as of March 31, 2015 and December 31, 2014, each with a redemption value of $10,000 per share	4,044	4,044
Common stock of $0.01 par value – 128,000,000 shares authorized; 71,594,960 and 71,568,936 shares issued as of March 31, 2015 and December 31, 2014, respectively	529	529
Paid-in capital	1,207,294	1,206,305
Accumulated deficit	-598,408	-535,176
Deferred compensation obligation	3,267	3,211
Accumulated other comprehensive income	238	249
Treasury stock – 273,564 and 262,070 shares of common stock, at cost, as of March 31, 2015 and December 31, 2014, respectively	-3,400	-3,345
Total shareholders’ equity	613,564	675,817
Total liabilities and shareholders’ equity	$2,198,651	$2,200,240

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Preferred stock, par value	$100	$100
Preferred stock, shares authorized	100,000	100,000
Preferred stock, redemption value per share (in dollars per share)	$10,000	$10,000
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	128,000,000	128,000,000
Common stock, shares issued	71,594,960	71,568,936
Treasury stock, shares	273,564	262,070
Series A Preferred Stock
Statement of Financial Position [Abstract]
Preferred stock, issued	7,945	7,945
Series B Preferred Stock
Statement of Financial Position [Abstract]
Preferred stock, issued	32,500	32,500

CONDENSED_CONSOLIDATED_STATEME3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities
Net income (loss)	($57,165)	$19,225
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	90,790	72,187
Accretion of firm transportation obligation	212	354
Derivative contracts:
Net losses (gains)	-22,867	15,662
Cash settlements, net	37,492	-3,057
Deferred income tax expense	141	14,064
Loss (gain) on sales of assets, net	91	-56,826
Non-cash exploration expense	1,983	3,294
Non-cash interest expense	1,104	1,012
Share-based compensation (equity-classified)	990	825
Other, net	9	206
Changes in operating assets and liabilities, net	-7,228	-386
Net cash provided by operating activities	45,552	66,560
Cash flows from investing activities
Capital expenditures – property and equipment	-168,994	-159,804
Proceeds from sales of assets, net	116	95,964
Net cash used in investing activities	-168,878	-63,840
Cash flows from financing activities
Proceeds from revolving credit facility borrowings	127,000	85,000
Repayment of revolving credit facility borrowings	0	-101,000
Dividends paid on preferred stock	-6,067	-1,725
Other, net	0	1,085
Net cash provided by (used in) financing activities	120,933	-16,640
Net decrease in cash and cash equivalents	-2,393	-13,920
Cash and cash equivalents – beginning of period	6,252	23,474
Cash and cash equivalents – end of period	3,859	9,554
Cash paid for:
Interest	732	1,025
Income taxes	$0	$0

Organization

Organization	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Organization	Organization
	Penn Virginia Corporation (together with its consolidated subsidiaries unless the context otherwise requires, “Penn Virginia,” the “Company,” “we,” “us” or “our”) is an independent oil and gas company engaged in the exploration, development and production of oil, natural gas liquids (“NGLs”) and natural gas in various onshore regions of the United States. Our current operations consist primarily of drilling unconventional horizontal development wells in the Eagle Ford Shale in South Texas. We also have operations in the Granite Wash in Oklahoma and the Haynesville Shale and Cotton Valley in East Texas.

Basis_of_Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation
	Our unaudited Condensed Consolidated Financial Statements include the accounts of Penn Virginia and all of our subsidiaries. Intercompany balances and transactions have been eliminated. Our Condensed Consolidated Financial Statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”). Preparation of these statements involves the use of estimates and judgments where appropriate. In the opinion of management, all adjustments, consisting of normal recurring accruals, considered necessary for a fair presentation of our Condensed Consolidated Financial Statements have been included. Our Condensed Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and Notes included in our Annual Report on Form 10-K for the year ended December 31, 2014. Operating results for the three months ended March 31, 2015 are not necessarily indicative of the results that may be expected for the year ending December 31, 2015. Certain amounts for the 2014 period have been reclassified to conform to the current year presentation.
	Effective January 2015, we adopted the provisions of ASU No. 2015–03, Simplifying the Presentation of Debt Issuance Costs (“ASU 2015–03”) on a retrospective basis. ASU 2015–03 requires that debt issuance costs be presented as a direct reduction to the face amount of the underlying debt instruments to which they are attributable. Accordingly, we have presented the debt issuance costs, net of amortization, associated with our outstanding senior notes and revolving credit facility (the “Revolver”), which were formerly presented as a component of Other assets, as a reduction to Long-term debt (see Note 7) for all periods presented.
	In May 2014, the FASB issued ASU No. 2014–09, Revenue from Contracts with Customers (“ASU 2014–09”), which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. ASU 2014–09 will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective, currently anticipated on January 1, 2018. The standard permits the use of either the retrospective or cumulative effect transition method upon adoption. We are evaluating the effect that ASU 2014–09 will have on our consolidated financial statements and related disclosures. We have not yet selected a transition method nor have we determined the effect of ASU 2014–09 on our ongoing financial reporting.
	Management has evaluated all activities of the Company through the date upon which our Condensed Consolidated Financial Statements were issued and concluded that, except in connection with an amendment to our Revolver as discussed in Note 7, no subsequent events have occurred that would require recognition in our Condensed Consolidated Financial Statements or disclosure in the Notes to Condensed Consolidated Financial Statements.

Divestitures

Divestitures	3 Months Ended
	Mar. 31, 2015
Acquisitions and Divestitures [Abstract]
Acquisitions and Divestitures	Divestitures
	In January 2014, we sold our natural gas gathering and gas lift assets in South Texas to American Midstream Partners, LP (“AMID”) for proceeds of approximately $96 million, net of transaction costs. Concurrent with the sale, we entered into a long-term agreement with AMID to provide us natural gas gathering, compression and gas lift services for a substantial portion of our current and future South Texas natural gas production. We realized a gain of $67.3 million, of which $56.7 million was recognized upon the closing of the transaction and the remaining $10.6 million was deferred and is being recognized over a twenty-five year period. We amortized $0.1 million of the deferred gain during each of the three months ended March 31, 2015 and 2014, respectively. As of March 31, 2015, $0.4 million of the remaining deferred gain is included as a component of Accounts payable and accrued expenses and $9.7 million, representing the noncurrent portion, is included as a component of Other liabilities on our Condensed Consolidated Balance Sheets.
	In July 2014, we sold the rights to construct a crude oil gathering and intermediate transportation system in South Texas to Republic Midstream, LLC (“Republic”) for proceeds of approximately $147 million, net of transaction costs. Concurrent with the sale, we entered into long-term agreements with Republic to provide us gathering and intermediate transportation services for a substantial portion of our future South Texas crude oil and condensate production. We realized a gain of $147.1 million, of which $63.0 million was recognized upon the closing of the transaction and the remaining $84.1 million was deferred and will be recognized over a twenty-five year period beginning after the system has been constructed and is operational, currently expected to be in the fourth quarter of 2015. As of March 31, 2015, $3.4 million of the deferred gain is included as a component of Accounts payable and accrued expenses and $80.7 million, representing the noncurrent portion, is included as a component of Other liabilities on our Condensed Consolidated Balance Sheets.

Accounts_Receivable_and_Major_

Accounts Receivable and Major Customers	3 Months Ended
	Mar. 31, 2015
Receivables [Abstract]
Accounts Receivable and Major Customers	Accounts Receivable and Major Customers
	The following table summarizes our accounts receivable by type as of the dates presented:
		As of
		March 31,			December 31,
		2015			2014
	Customers	$	57,125		$	62,650
	Joint interest partners	86,297			120,708
	Other	6,787			6,549
		150,209			189,907
	Less: Allowance for doubtful accounts	(280		)	(280		)
		$	149,929		$	189,627
	For the three months ended March 31, 2015, three customers accounted for $47.9 million, or approximately 66%, of our consolidated product revenues. The revenues generated from these customers during the three months ended March 31, 2015 were $28.0 million, $12.0 million and $7.9 million or 38%, 17% and 11% of the consolidated total, respectively. As of March 31, 2015, $27.4 million, or approximately 48% of our consolidated accounts receivable from customers was related to these customers. For the three months ended March 31, 2014, four customers accounted for $89.5 million, or approximately 67% of our consolidated product revenues. The revenues generated from these customers during the three months ended March 31, 2014 were $38.8 million, $17.4 million, $17.2 million and $16.1 million or approximately 29%, 13%, 13% and 12% of the consolidated total, respectively. As of December 31, 2014, $36.1 million, or approximately 58% of our consolidated accounts receivable from customers, was related to these customers. No significant uncertainties exist related to the collectability of amounts owed to us by any of these customers.

Derivative_Instruments

Derivative Instruments	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Derivative Instruments
	We utilize derivative instruments to mitigate our financial exposure to crude oil and natural gas price volatility. Our derivative instruments are not formally designated as hedges.
	Commodity Derivatives
	We utilize collars and swaps, which are placed with financial institutions that we believe are acceptable credit risks, to hedge against the variability in cash flows associated with anticipated sales of our future oil and gas production. While the use of derivative instruments limits the risk of adverse price movements, such use may also limit future revenues from favorable price movements.
	The counterparty to a collar or swap contract is required to make a payment to us if the settlement price for any settlement period is below the floor or swap price for such contract. We are required to make a payment to the counterparty if the settlement price for any settlement period is above the ceiling or swap price for such contract. Neither party is required to make a payment to the other party if the settlement price for any settlement period is equal to or greater than the floor price and equal to or less than the ceiling price for such contract.
	We determine the fair values of our commodity derivative instruments based on discounted cash flows derived from third-party quoted forward prices for NYMEX Henry Hub gas and West Texas Intermediate crude oil closing prices as of the end of the reporting period. The discounted cash flows utilize discount rates adjusted for the credit risk of our counterparties if the derivative is in an asset position and our own credit risk if the derivative is in a liability position.
	The following table sets forth our commodity derivative positions as of March 31, 2015:
				Average
				Volume Per			Weighted Average Price						Fair Value
		Instrument		Day			Floor/Swap			Ceiling			Asset			Liability
	Crude Oil:			(barrels)			($/barrel)
	Second quarter 2015 1	Collars		4,000			$	87.5		$	94.66		$	10,045		$	—
	Third quarter 2015 1	Collars		3,000			$	86.67		$	94.73		6,063			—
	Fourth quarter 2015 1	Collars		3,000			$	86.67		$	94.73		5,738			—
	Second quarter 2015 1	Swaps		9,000			$	91.81					27,053			—
	Third quarter 2015 1	Swaps		8,000			$	91.06					23,139			—
	Fourth quarter 2015 1	Swaps		8,000			$	91.06					21,918			—
	First quarter 2016	Swaps		4,000			$	88.12					11,392			—
	Second quarter 2016	Swaps		4,000			$	88.12					10,933			—
	Third quarter 2016	Swaps		4,000			$	88.12					10,649			—
	Fourth quarter 2016	Swaps		4,000			$	88.12					10,262			—
	Settlements to be received in subsequent period												13,061			—
	_______________________
	1 Certain crude oil derivative transactions include put options we sold. All of the put options carry a $70.00 strike price. If the price of WTI Crude Oil settles below $70.00 per barrel for any given measurement period, the cash received by us on the derivative settlement will be limited to the difference between the Floor/Swap price and the $70.00 put option strike price. The sum of the notional volumes attached to the short puts is 6,000 barrels per day for the second quarter of 2015, and 5,000 barrels per day for the third and fourth quarters of 2015.
	Financial Statement Impact of Derivatives
	The impact of our derivatives activities on income is included in the Derivatives caption on our Condensed Consolidated Statements of Operations. The following table summarizes the effects of our derivative activities for the periods presented:
		Three Months Ended
		March 31,
		2015				2014
	Cash settlements and gains (losses):
	Cash (paid) received for:
	Commodity contract settlements	$	37,492			$	(3,057	)
	Losses attributable to:
	Commodity contracts	(14,625		)		(12,605		)
		$	22,867			$	(15,662	)
	The effects of derivative gains and (losses) and cash settlements of our commodity derivatives are reported as adjustments to reconcile net income (loss) to net cash provided by operating activities. These items are recorded in the Derivative contracts section of our Condensed Consolidated Statements of Cash Flows under the Net losses (gains) and Cash settlements, net captions.
	The following table summarizes the fair values of our derivative instruments, as well as the locations of these instruments on our Condensed Consolidated Balance Sheets as of the dates presented:
				Fair Values as of
				31-Mar-15							31-Dec-14
				Derivative				Derivative			Derivative			Derivative
	Type		Balance Sheet Location	Assets				Liabilities			Assets			Liabilities
	Commodity contracts		Derivative assets/liabilities – current	$	118,409			$	—		$	128,981		$	—
	Commodity contracts		Derivative assets/liabilities – noncurrent	31,844				—			35,897			—
				$	150,253			$	—		$	164,878		$	—
	As of March 31, 2015, we reported a commodity derivative asset of $150.3 million. The contracts associated with this position are with seven counterparties, all of which are investment grade financial institutions, and are substantially concentrated with five of those counterparties. This concentration may impact our overall credit risk, either positively or negatively, in that these counterparties may be similarly affected by changes in economic or other conditions. We have neither paid to, nor received from, our counterparties any cash collateral in connection with our derivative positions. No significant uncertainties exist related to the collectability of amounts that may be owed to us by these counterparties.

Property_and_Equipment

Property and Equipment	3 Months Ended
	Mar. 31, 2015
Property, Plant and Equipment [Abstract]
Property and Equipment	Property and Equipment
	The following table summarizes our property and equipment as of the dates presented:
		As of
		March 31,			December 31,
		2015			2014
	Oil and gas properties:
	Proved	$	3,533,859		$	3,390,482
	Unproved	127,504			125,676
	Total oil and gas properties	3,661,363			3,516,158
	Other property and equipment	76,058			75,073
	Total properties and equipment	3,737,421			3,591,231
	Accumulated depreciation, depletion and amortization	(1,856,809		)	(1,766,133		)
		$	1,880,612		$	1,825,098

LongTerm_Debt

Long-Term Debt	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt
	The following table summarizes our long-term debt as of the dates presented giving effect to the adoption of ASU 2015–03:
		As of
		31-Mar-15				31-Dec-14
		Principal		Unamortized Issuance Costs		Principal		Unamortized Issuance Costs
	Revolving credit facility	$	162,000	$	1,476	$	35,000	$	1,623
	Senior notes due 2019	300,000		3,928		300,000		4,131
	Senior notes due 2020	775,000		19,686		775,000		20,440
	Totals	1,237,000		$	25,090	1,110,000		$	26,194
	Long-term debt, net of unamortized issuance costs	$	1,211,910			$	1,083,806
	Revolving Credit Facility
	In May 2015, in connection with our regular semi-annual redetermination, the Revolver was amended to decrease the revolving commitment to $425 million from $450 million and to decrease the borrowing base to $425 million from $500 million. The decrease was due primarily to substantial declines in commodity prices partially offset by development of proved undeveloped locations. The next semi-annual redetermination is scheduled for November 2015. The Revolver has an accordion feature that allows us to increase the commitment by up to an additional $175 million upon receiving additional commitments from one or more lenders. The Revolver also includes a $20 million sublimit for the issuance of letters of credit. The Revolver is governed by a borrowing base calculation, which is re-determined semi-annually, and the availability under the Revolver may not exceed the lesser of the aggregate commitments and the borrowing base. The Revolver allows for the administrative agent to replace any lender who fails to approve a borrowing base increase approved by lenders representing two-thirds of the aggregate commitment. The Revolver is available to us for general purposes, including working capital, capital expenditures and acquisitions. The Revolver matures in September 2017. We had letters of credit of $1.8 million outstanding as of March 31, 2015. As of March 31, 2015, our available borrowing capacity under the Revolver was $286.2 million before giving effect to the reduced commitment and borrowing base.
	Borrowings under the Revolver bear interest, at our option, at either (i) a rate derived from the London Interbank Offered Rate, as adjusted for statutory reserve requirements for Eurocurrency liabilities (“Adjusted LIBOR”), plus an applicable margin (ranging from 1.500% to 2.500%) or (ii) the greater of (a) the prime rate, (b) the federal funds effective rate plus 0.5% or (c) the one-month Adjusted LIBOR plus 1.0%, plus, in each case, an applicable margin (ranging from 0.500% to 1.500%). The applicable margin is determined based on the ratio of our outstanding borrowings to the available Revolver capacity. As of March 31, 2015, the actual interest rate on the outstanding borrowings under the Revolver was 1.9375%, which is derived from an Adjusted LIBOR rate of 0.1875% plus an applicable margin of 1.75%. Commitment fees are charged at 0.375% to 0.500% on the undrawn portion of the Revolver depending on our ratio of outstanding borrowings to the available Revolver capacity. As of March 31, 2015, commitment fees were being charged at a rate of 0.375%.
	The Revolver is guaranteed by Penn Virginia and all of our material subsidiaries (the “Guarantor Subsidiaries”). The obligations under the Revolver are secured by a first priority lien on substantially all of our proved oil and gas reserves and a pledge of the equity interests in the Guarantor Subsidiaries.
	The Revolver includes both current ratio and leverage ratio financial covenants. The current ratio is defined in the Revolver to include, among other things, adjustments for undrawn availability and may not be less than 1.0 to 1.0. In May 2015, the Revolver was amended to increase the leverage ratio, defined in the Revolver as the ratio of total debt to EBITDAX, that, for any four consecutive quarters, may not exceed 4.75 to 1.0 through March 31, 2016; 5.25 to 1.0 through June 30, 2016; 5.50 to 1.0 through December 31, 2016; 4.50 to 1.0 through March 31, 2017; and 4.0 to 1.0 through maturity in September 2017. Furthermore, the amendment precludes the payment of cash dividends on our outstanding convertible preferred stock if the total debt to EBITDAX ratio exceeds 5.0 to 1.0. In addition, the Revolver was amended to require a credit exposure leverage covenant, defined in the Revolver as the ratio of credit exposure to EBITDAX, that, for any four consecutive quarters ending on or prior to March 31, 2017, may not exceed 2.75 to 1.0. Credit exposure consists of all outstanding borrowings under the Revolver plus any outstanding letters of credits.
	2019 Senior Notes
	Our 7.25% Senior Notes due 2019 (the “2019 Senior Notes”), which were issued at par in April 2011, bear interest at an annual rate of 7.25% payable on April 15 and October 15 of each year. We may redeem all or part of the 2019 Senior Notes at a redemption price starting at 103.625% of the principal amount and reducing to 100% in June 2017 and thereafter. The 2019 Senior Notes are senior to our existing and future subordinated indebtedness and are subordinated to our secured indebtedness, including the Revolver, to the extent of the collateral securing that indebtedness. The obligations under the 2019 Senior Notes are fully and unconditionally guaranteed by the Guarantor Subsidiaries.
	2020 Senior Notes
	Our 2020 Senior Notes due 2020 (the “2020 Senior Notes”), which were issued at par in April 2013, bear interest at an annual rate of 8.5% payable on May 1 and November 1 of each year. The 2020 Senior Notes are senior to our existing and future subordinated indebtedness and are subordinated to our secured indebtedness, including the Revolver, to the extent of the collateral securing that indebtedness. The obligations under the 2020 Senior Notes are fully and unconditionally guaranteed by the Guarantor Subsidiaries.
	Guarantees
	The guarantees provided by Penn Virginia, which is the parent company, and the Guarantor Subsidiaries under the Revolver and the 2019 Senior Notes and 2020 Senior Notes are full and unconditional and joint and several. Substantially all of our consolidated assets are held by the Guarantor Subsidiaries. The parent company and its non-guarantor subsidiaries have no material independent assets or operations. There are no significant restrictions on the ability of the parent company to obtain funds from the Guarantor Subsidiaries through dividends, advances or loans.

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	Income Taxes
	Due to the pre-tax operating loss incurred, we recognized a federal income tax benefit for the three months ended March 31, 2015 at the statutory rate of 35%; however, the federal tax benefit was fully offset by a valuation allowance against our net deferred tax assets. We considered both the positive and negative evidence in determining that it was more likely than not that some portion or all of our deferred tax assets will not be realized, primarily as a result of recent cumulative losses. The income tax provision also includes a minimal deferred state income tax expense resulting in a combined effective tax rate of 0.2%. The significant difference between our combined federal and state statutory rate of 35.7% and our estimated effective tax of 0.2% is due primarily to the valuation allowance placed against our deferred tax assets.
	We recognized income tax expense for the three months ended March 31, 2014 at an effective rate of 42.6% which reflects the adverse effects of losses incurred in jurisdictions for which we may not realize a tax benefit and therefore recorded a valuation allowance against the related deferred tax assets.

Restructuring_and_Exit_Activit

Restructuring and Exit Activities	3 Months Ended
	Mar. 31, 2015
Restructuring and Related Activities [Abstract]
Restructuring and Exit Activities	Firm Transportation Obligation
	We have a contractual obligation for certain firm transportation capacity in the Appalachian region that expires in 2022 and, as a result of the sale of our natural gas assets in West Virginia, Kentucky and Virginia in 2012, we no longer have production to satisfy this commitment. We recognized an obligation in 2012 representing the liability for estimated discounted future net cash outflows over the remaining term of the contract.
	The following table reconciles the obligation as of the dates presented:
		As of
		March 31,			December 31,
		2015			2014
	Balance at beginning of period	$	14,790		$	15,993
	Accretion	212			1,301
	Cash payments, net	(523		)	(2,504		)
	Balance at end of period	$	14,479		$	14,790
	The accretion of the obligation, net of any recoveries from the periodic sale of our contractual capacity, is charged as an offset to Other revenue. As of March 31, 2015, $2.8 million of the obligation is classified as current and is included in the Accounts payable and accrued liabilities caption while the remaining $11.7 million is classified as noncurrent and is included in the Other liabilities caption on our Condensed Consolidated Balance Sheets.

Additional_Balance_Sheet_Detai

Additional Balance Sheet Detail	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Additional Balance Sheet Detail	Additional Balance Sheet Detail
	The following table summarizes components of selected balance sheet accounts as of the dates presented:
		As of
		March 31,		December 31,
		2015		2014
	Other current assets:
	Tubular inventory and well materials	$	5,323	$	5,802
	Prepaid expenses	4,267		4,215
	Other	97		97
		$	9,687	$	10,114
	Other assets:
	Assets of supplemental employee retirement plan (“SERP”)	4,216		4,123
	Other	95		95
		$	4,311	$	4,218
	Accounts payable and accrued liabilities:
	Trade accounts payable	$	121,891	$	174,496
	Drilling and other lease operating costs	47,131		68,842
	Royalties	25,971		27,883
	Compensation – related	4,313		9,197
	Interest	37,630		15,555
	Preferred stock dividends	6,067		6,067
	Other	2,063		10,187
		$	245,066	$	312,227
	Other liabilities:
	Deferred gains on sale of assets	$	90,463	$	90,569
	Firm transportation obligation	11,723		12,042
	Asset retirement obligations (“AROs”)	6,049		5,889
	Defined benefit pension obligations	1,565		1,753
	Postretirement health care benefit obligations	914		890
	Compensation – related	7,612		7,631
	Deferred compensation – SERP obligations and other	4,270		4,183
	Other	928		929
		$	123,524	$	123,886

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements
	We apply the authoritative accounting provisions for measuring fair value of both our financial and nonfinancial assets and liabilities. Fair value is an exit price representing the expected amount we would receive upon the sale of an asset or that we would expect to pay to transfer a liability in an orderly transaction with market participants at the measurement date.
	Our financial instruments that are subject to fair value disclosure consist of cash and cash equivalents, accounts receivable, accounts payable, derivatives and long-term debt. As of March 31, 2015, the carrying values of all of these financial instruments, except the portion of long-term debt with fixed interest rates, approximated fair value.
	The following table summarizes the fair value of our long-term debt with fixed interest rates, which is estimated based on the published market prices for these debt obligations, as of the dates presented:
		As of
		31-Mar-15								31-Dec-14
		Fair				Carrying				Fair			Carrying
		Value				Value				Value			Value
	Senior Notes due 2019	$	271,500			$	300,000			$	234,000		$	300,000
	Senior Notes due 2020	720,750				775,000				620,000			775,000
		$	992,250			$	1,075,000			$	854,000		$	1,075,000
	Recurring Fair Value Measurements
	Certain financial assets and liabilities are measured at fair value on a recurring basis in our Condensed Consolidated Balance Sheets. The following tables summarize the valuation of those assets and liabilities as of the dates presented:
			As of March 31, 2015
			Fair Value				Fair Value Measurement Classification
	Description		Measurement				Level 1				Level 2			Level 3
	Assets:
	Commodity derivative assets – current		$	118,409			$	—			$	118,409		$	—
	Commodity derivative assets – noncurrent		31,844				—				31,844			—
	Assets of SERP		4,216				4,216				—			—
	Liabilities:
	Deferred compensation – SERP obligations		(4,269		)		(4,269		)		—			—
			As of December 31, 2014
			Fair Value				Fair Value Measurement Classification
	Description		Measurement				Level 1				Level 2			Level 3
	Assets:
	Commodity derivative assets – current		$	128,981			$	—			$	128,981		$	—
	Commodity derivative assets – noncurrent		35,897				—				35,897			—
	Assets of SERP		4,123				4,123				—			—
	Liabilities:
	Deferred compensation – SERP obligations		(4,178		)		(4,178		)		—			—
	Changes in economic conditions or model-based valuation techniques may require the transfer of financial instruments from one level of the fair value hierarchy to another level. In such instances, the transfer is deemed to have occurred at the beginning of the quarterly period in which the event or change in circumstances that caused the transfer occurred. There were no transfers during the three months ended March 31, 2015 and 2014.
	We used the following methods and assumptions to estimate fair values for the financial assets and liabilities described below:
	•	Commodity derivatives: We determine the fair values of our commodity derivative instruments based on discounted cash flows derived from third-party quoted forward prices for West Texas Intermediate crude oil and NYMEX Henry Hub gas closing prices as of the end of the reporting periods. We generally use the income approach, using valuation techniques that convert future cash flows to a single discounted value. Each of these is a level 2 input.
	•	Assets of SERP: We hold various publicly traded equity securities in a Rabbi Trust as assets for funding certain deferred compensation obligations. The fair values are based on quoted market prices, which are level 1 inputs.
	•	Deferred compensation – SERP obligations: Certain of our deferred compensation obligations are ultimately to be settled in cash based on the underlying fair value of certain assets, including those held in the Rabbi Trust. The fair values are based on quoted market prices, which are level 1 inputs.
	Non-Recurring Fair Value Measurements
	The most significant non-recurring fair value measurements utilized in the preparation of our Condensed Consolidated Financial Statements are those attributable to the recognition and measurement of net assets acquired, the recognition and measurement of asset impairments and the initial determination of AROs. The factors used to determine fair value for purposes of recognizing and measuring net assets acquired and asset impairments include, but are not limited to, estimates of proved and probable reserves, future commodity prices, indicative sales prices for properties, the timing of future production and capital expenditures and a discount rate commensurate with the risk reflective of the lives remaining for the respective oil and gas properties. Because these significant fair value inputs are typically not observable, we have categorized the amounts as level 3 inputs.
	The determination of the fair value of AROs is based upon regional market and facility specific information. The amount of an ARO and the costs capitalized represent the estimated future cost to satisfy the abandonment obligation using current prices that are escalated by an assumed inflation factor after discounting the future cost back to the date that the abandonment obligation was incurred using a rate commensurate with the risk, which approximates our cost of funds. Because these significant fair value inputs are typically not observable, we have categorized the initial estimates as level 3 inputs.

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies
	Drilling and Completion Commitments
	As of March 31, 2015, we had contractual commitments for three drilling rigs with terms expiring in July 2015, September 2015 and February 2016, respectively. The minimum commitment under these agreements is $14.6 million for the remaining three quarters of 2015 and $1.1 million in 2016. In addition, we have a commitment to purchase certain coil tubing services that expires in December 2015. The minimum commitment for the remaining three quarters of 2015 under this agreement is $4.8 million. The drilling rig and coil tubing services agreements include early termination provisions that would require us to pay penalties if we terminate the agreements prior to the end of their scheduled terms. The amount of penalty is based on the number of days remaining in the contractual term. As of March 31, 2015, the penalty amount would have been $16.2 million had we terminated our agreements on that date.
	Firm Transportation Commitments
	We have entered into contracts that provide firm transportation capacity rights for specified volumes per day on various pipeline systems with remaining terms that range from less than one to 13 years. The contracts require us to pay transportation demand charges regardless of the amount of pipeline capacity we use. The minimum commitment under these agreements is $1.5 million for the the remaining three quarters of 2015 and approximately $1.1 million per year through 2028. We may sell excess capacity to third parties at our discretion.
	Gathering and Intermediate Transportation Commitments
	We have entered into a long-term agreement that provides natural gas gathering, compression and gas lift services for a substantial portion of our natural gas production in the South Texas region through 2038. The agreement requires us to make certain minimum fee payments regardless of the volume of natural gas production for the first three years of the term. The minimum fee requirement under this agreement is $3.2 million for the remaining three quarters of 2015 and $5.0 million in 2016.
	As discussed in Note 3, we entered into long-term agreements that provide gathering and intermediate pipeline transportation services for a substantial portion of our crude oil and condensate production in the South Texas region. Our obligations under the agreements are expected to begin in the fourth quarter of 2015 when construction of the system is completed. The agreements require us to commit certain minimum volumes of crude oil production for the first ten years of the agreements’ terms, which will result in minimum fee requirements of approximately $13.7 million on an annual basis.
	Legal and Regulatory
	We are involved, from time to time, in various legal proceedings arising in the ordinary course of business. While the ultimate results of these proceedings cannot be predicted with certainty, our management believes that these claims will not have a material effect on our financial position, results of operations or cash flows. During 2010, we established a $0.9 million reserve for a litigation matter pertaining to certain properties that remained outstanding as of March 31, 2015. In March 2015, we established an additional $0.3 million reserve for litigation attributable to certain other properties that we previously sold. As of March 31, 2015, we also had AROs of approximately $6.0 million attributable to the plugging of abandoned wells.

Shareholders_Equity

Shareholders' Equity	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Shareholders' Equity	Shareholders’ Equity
	The following tables summarize the components of our shareholders’ equity and the changes therein as of and for the three months ended March 31, 2015 and 2014:
		As of												As of
		December 31,						Dividends			All Other			March 31,
		2014			Net Loss			Declared 1			Changes 2			2015
	Preferred stock	$	4,044		$	—		$	—		$	—		$	4,044
	Common stock	529			—			—			—			529
	Paid-in capital	1,206,305			—			—			989			1,207,294
	Accumulated deficit	(535,176		)	(57,165		)	(6,067		)	—			(598,408		)
	Deferred compensation obligation	3,211			—			—			56			3,267
	Accumulated other comprehensive income 3	249			—			—			(11		)	238
	Treasury stock	(3,345		)	—			—			(55		)	(3,400		)
		$	675,817		$	(57,165	)	$	(6,067	)	$	979		$	613,564
		As of												As of
		December 31,						Dividends			All Other			March 31,
		2013			Net Income			Declared 1			Changes 2			2014
	Preferred stock	$	1,150		$	—		$	—		$	(2	)	$	1,148
	Common stock	466			—			—			2			468
	Paid-in capital	891,351			—			—			1,911			893,262
	Accumulated deficit	(104,180		)	19,225			(1,722		)	—			(86,677		)
	Deferred compensation obligation	2,792			—			—			105			2,897
	Accumulated other comprehensive income 3	267			—			—			25			292
	Treasury stock	(3,042		)	—			—			(105		)	(3,147		)
		$	788,804		$	19,225		$	(1,722	)	$	1,936		$	808,243
	_______________________
	1 Includes dividends of $150.00 per share on our 6% Series A Convertible Perpetual Preferred Stock (the “Series A Preferred Stock”) and $150.00 per share on our 6% Series B Convertible Perpetual Preferred Stock (the “Series B Preferred Stock”).
	2 Includes equity-classified share-based compensation of $990 and $825 for the three months ended March 31, 2015 and 2014.
	3 The Accumulated other comprehensive income (“AOCI”) is entirely attributable to our defined benefit pension and postretirement health care plans. The changes in the balance of AOCI for the three months ended March 31, 2015 and 2014 represent reclassifications from AOCI to net periodic benefit expense, a component of General and administrative expenses, of $(17) and $38 and are presented above net of taxes of $(6) and $13.

ShareBased_Compensation

Share-Based Compensation	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation	Share-Based Compensation
	The Penn Virginia Corporation 2013 Amended and Restated Long-Term Incentive Plan (the “LTI Plan”) permits the grant of incentive and nonqualified stock options, common stock, deferred common stock units, restricted stock and restricted stock units to our employees and directors. We recognize compensation expense related to the LTI Plan in the General and administrative caption on our Condensed Consolidated Statements of Operations.
	With the exception of performance-based restricted stock units (“PBRSUs”), all of the awards issued under the LTI Plan are classified as equity instruments because they result in the issuance of common stock on the date of grant, upon exercise or are otherwise payable in common stock upon vesting, as applicable. The compensation cost attributable to these awards is measured at the grant date and recognized over the applicable vesting period as a non-cash item of expense. Because the PBRSUs are payable in cash, they are considered liability-classified awards and are included in the Accounts payable and accrued liabilities (current portion) and Other liabilities (noncurrent portion) captions on our Condensed Consolidated Balance Sheets. Compensation cost associated with the PBRSUs is measured at the end of each reporting period and recognized based on the period of time that has elapsed during each of the individual performance periods.
	The following table summarizes our share-based compensation expense recognized for the periods presented:
		Three Months Ended
		March 31,
		2015		2014
	Equity-classified awards:
	Stock option awards	$	393	$	461
	Common, deferred and restricted stock and stock unit awards	597		364
		990		825
	Liability-classified awards	379		5,945
		$	1,369	$	6,770
	In February 2015, we paid $1.5 million in cash, pursuant to the terms of PBRSU grants made in 2012.

Interest_Expense

Interest Expense	3 Months Ended
	Mar. 31, 2015
Banking and Thrift [Abstract]
Interest Expense	Interest Expense
	The following table summarizes the components of interest expense for the periods presented:
		Three Months Ended
		March 31,
		2015			2014
	Interest on borrowings and related fees	$	22,808		$	23,140
	Amortization of debt issuance costs	1,104			1,012
	Capitalized interest	(1,899		)	(1,618		)
		$	22,013		$	22,534

Earnings_per_Share

Earnings per Share	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings per Share	Earnings per Share
	The following table provides a reconciliation of the components used in the calculation of basic and diluted earnings per share for the periods presented:
		Three Months Ended
		March 31,
		2015			2014
	Net income (loss)	$	(57,165	)	$	19,225
	Less: Preferred stock dividends	(6,067		)	(1,722		)
	Net income (loss) attributable to common shareholders – basic	$	(63,232	)	$	17,503
	Add: Preferred stock dividends 1	—			1,722
	Net income (loss) attributable to common shareholders – diluted	$	(63,232	)	$	19,225
	Weighted-average shares – basic	71,820			65,611
	Effect of dilutive securities 2	—			20,133
	Weighted-average shares – diluted	71,820			85,744
	_______________________
	1 Preferred stock dividends were excluded from diluted earnings per share for the three months ended March 31, 2015, as the assumed conversion of the outstanding preferred stock would have been anti-dilutive.
	2 For the three months ended March 31, 2015, approximately 31.3 million potentially dilutive securities, including the Series A Preferred Stock and Series B Preferred Stock, stock options and restricted stock units, had the effect of being anti-dilutive and were excluded from the calculation of diluted earnings per common share.

Basis_of_Presentation_Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2015
Schedule of Policies [Line Items]
Basis of Presentation	Basis of Presentation
	Our unaudited Condensed Consolidated Financial Statements include the accounts of Penn Virginia and all of our subsidiaries. Intercompany balances and transactions have been eliminated. Our Condensed Consolidated Financial Statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”). Preparation of these statements involves the use of estimates and judgments where appropriate. In the opinion of management, all adjustments, consisting of normal recurring accruals, considered necessary for a fair presentation of our Condensed Consolidated Financial Statements have been included. Our Condensed Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and Notes included in our Annual Report on Form 10-K for the year ended December 31, 2014. Operating results for the three months ended March 31, 2015 are not necessarily indicative of the results that may be expected for the year ending December 31, 2015. Certain amounts for the 2014 period have been reclassified to conform to the current year presentation.
	Effective January 2015, we adopted the provisions of ASU No. 2015–03, Simplifying the Presentation of Debt Issuance Costs (“ASU 2015–03”) on a retrospective basis. ASU 2015–03 requires that debt issuance costs be presented as a direct reduction to the face amount of the underlying debt instruments to which they are attributable. Accordingly, we have presented the debt issuance costs, net of amortization, associated with our outstanding senior notes and revolving credit facility (the “Revolver”), which were formerly presented as a component of Other assets, as a reduction to Long-term debt (see Note 7) for all periods presented.
	In May 2014, the FASB issued ASU No. 2014–09, Revenue from Contracts with Customers (“ASU 2014–09”), which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. ASU 2014–09 will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective, currently anticipated on January 1, 2018. The standard permits the use of either the retrospective or cumulative effect transition method upon adoption. We are evaluating the effect that ASU 2014–09 will have on our consolidated financial statements and related disclosures. We have not yet selected a transition method nor have we determined the effect of ASU 2014–09 on our ongoing financial reporting.
	Management has evaluated all activities of the Company through the date upon which our Condensed Consolidated Financial Statements were issued and concluded that, except in connection with an amendment to our Revolver as discussed in Note 7, no subsequent events have occurred that would require recognition in our Condensed Consolidated Financial Statements or disclosure in the Notes to Condensed Consolidated Financial Statements.
Fair Value Measurements	We apply the authoritative accounting provisions for measuring fair value of both our financial and nonfinancial assets and liabilities. Fair value is an exit price representing the expected amount we would receive upon the sale of an asset or that we would expect to pay to transfer a liability in an orderly transaction with market participants at the measurement date.
Fair Value, Measurements, Recurring
Schedule of Policies [Line Items]
Fair Value Measurements	We used the following methods and assumptions to estimate fair values for the financial assets and liabilities described below:
	•	Commodity derivatives: We determine the fair values of our commodity derivative instruments based on discounted cash flows derived from third-party quoted forward prices for West Texas Intermediate crude oil and NYMEX Henry Hub gas closing prices as of the end of the reporting periods. We generally use the income approach, using valuation techniques that convert future cash flows to a single discounted value. Each of these is a level 2 input.
	•	Assets of SERP: We hold various publicly traded equity securities in a Rabbi Trust as assets for funding certain deferred compensation obligations. The fair values are based on quoted market prices, which are level 1 inputs.
	•	Deferred compensation – SERP obligations: Certain of our deferred compensation obligations are ultimately to be settled in cash based on the underlying fair value of certain assets, including those held in the Rabbi Trust. The fair values are based on quoted market prices, which are level 1 inputs.
Fair Value, Measurements, Nonrecurring
Schedule of Policies [Line Items]
Fair Value Measurements	The most significant non-recurring fair value measurements utilized in the preparation of our Condensed Consolidated Financial Statements are those attributable to the recognition and measurement of net assets acquired, the recognition and measurement of asset impairments and the initial determination of AROs. The factors used to determine fair value for purposes of recognizing and measuring net assets acquired and asset impairments include, but are not limited to, estimates of proved and probable reserves, future commodity prices, indicative sales prices for properties, the timing of future production and capital expenditures and a discount rate commensurate with the risk reflective of the lives remaining for the respective oil and gas properties. Because these significant fair value inputs are typically not observable, we have categorized the amounts as level 3 inputs.
	The determination of the fair value of AROs is based upon regional market and facility specific information. The amount of an ARO and the costs capitalized represent the estimated future cost to satisfy the abandonment obligation using current prices that are escalated by an assumed inflation factor after discounting the future cost back to the date that the abandonment obligation was incurred using a rate commensurate with the risk, which approximates our cost of funds. Because these significant fair value inputs are typically not observable, we have categorized the initial estimates as level 3 inputs.

Accounts_Receivable_and_Major_1

Accounts Receivable and Major Customers (Tables)	3 Months Ended
	Mar. 31, 2015
Receivables [Abstract]
Summary of Accounts Receivable	The following table summarizes our accounts receivable by type as of the dates presented:
		As of
		March 31,			December 31,
		2015			2014
	Customers	$	57,125		$	62,650
	Joint interest partners	86,297			120,708
	Other	6,787			6,549
		150,209			189,907
	Less: Allowance for doubtful accounts	(280		)	(280		)
		$	149,929		$	189,627

Derivative_Instruments_Tables

Derivative Instruments (Tables)	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Commodity Derivative Positions	The following table sets forth our commodity derivative positions as of March 31, 2015:
				Average
				Volume Per			Weighted Average Price						Fair Value
		Instrument		Day			Floor/Swap			Ceiling			Asset			Liability
	Crude Oil:			(barrels)			($/barrel)
	Second quarter 2015 1	Collars		4,000			$	87.5		$	94.66		$	10,045		$	—
	Third quarter 2015 1	Collars		3,000			$	86.67		$	94.73		6,063			—
	Fourth quarter 2015 1	Collars		3,000			$	86.67		$	94.73		5,738			—
	Second quarter 2015 1	Swaps		9,000			$	91.81					27,053			—
	Third quarter 2015 1	Swaps		8,000			$	91.06					23,139			—
	Fourth quarter 2015 1	Swaps		8,000			$	91.06					21,918			—
	First quarter 2016	Swaps		4,000			$	88.12					11,392			—
	Second quarter 2016	Swaps		4,000			$	88.12					10,933			—
	Third quarter 2016	Swaps		4,000			$	88.12					10,649			—
	Fourth quarter 2016	Swaps		4,000			$	88.12					10,262			—
	Settlements to be received in subsequent period												13,061			—
Impact of Derivative Activities on Condensed Consolidated Statements of Income	The impact of our derivatives activities on income is included in the Derivatives caption on our Condensed Consolidated Statements of Operations. The following table summarizes the effects of our derivative activities for the periods presented:
		Three Months Ended
		March 31,
		2015				2014
	Cash settlements and gains (losses):
	Cash (paid) received for:
	Commodity contract settlements	$	37,492			$	(3,057	)
	Losses attributable to:
	Commodity contracts	(14,625		)		(12,605		)
		$	22,867			$	(15,662	)
Fair Value of Derivative Instruments on Condensed Consolidated Balance Sheets	The following table summarizes the fair values of our derivative instruments, as well as the locations of these instruments on our Condensed Consolidated Balance Sheets as of the dates presented:
				Fair Values as of
				31-Mar-15							31-Dec-14
				Derivative				Derivative			Derivative			Derivative
	Type		Balance Sheet Location	Assets				Liabilities			Assets			Liabilities
	Commodity contracts		Derivative assets/liabilities – current	$	118,409			$	—		$	128,981		$	—
	Commodity contracts		Derivative assets/liabilities – noncurrent	31,844				—			35,897			—
				$	150,253			$	—		$	164,878		$	—

Property_and_Equipment_Tables

Property and Equipment (Tables)	3 Months Ended
	Mar. 31, 2015
Property, Plant and Equipment [Abstract]
Summary of Property and Equipment	The following table summarizes our property and equipment as of the dates presented:
		As of
		March 31,			December 31,
		2015			2014
	Oil and gas properties:
	Proved	$	3,533,859		$	3,390,482
	Unproved	127,504			125,676
	Total oil and gas properties	3,661,363			3,516,158
	Other property and equipment	76,058			75,073
	Total properties and equipment	3,737,421			3,591,231
	Accumulated depreciation, depletion and amortization	(1,856,809		)	(1,766,133		)
		$	1,880,612		$	1,825,098

LongTerm_Debt_Tables

Long-Term Debt (Tables)	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Carrying Amount of Components of Long-term Debt	The following table summarizes our long-term debt as of the dates presented giving effect to the adoption of ASU 2015–03:
		As of
		31-Mar-15				31-Dec-14
		Principal		Unamortized Issuance Costs		Principal		Unamortized Issuance Costs
	Revolving credit facility	$	162,000	$	1,476	$	35,000	$	1,623
	Senior notes due 2019	300,000		3,928		300,000		4,131
	Senior notes due 2020	775,000		19,686		775,000		20,440
	Totals	1,237,000		$	25,090	1,110,000		$	26,194
	Long-term debt, net of unamortized issuance costs	$	1,211,910			$	1,083,806

Restructuring_and_Exit_Activit1

Restructuring and Exit Activities (Tables)	3 Months Ended
	Mar. 31, 2015
Restructuring and Related Activities [Abstract]
Summary of Restructuring Related Obligations	The following table reconciles the obligation as of the dates presented:
		As of
		March 31,			December 31,
		2015			2014
	Balance at beginning of period	$	14,790		$	15,993
	Accretion	212			1,301
	Cash payments, net	(523		)	(2,504		)
	Balance at end of period	$	14,479		$	14,790

Additional_Balance_Sheet_Detai1

Additional Balance Sheet Detail (Tables)	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Components of Selected Balance Sheet Accounts	The following table summarizes components of selected balance sheet accounts as of the dates presented:
		As of
		March 31,		December 31,
		2015		2014
	Other current assets:
	Tubular inventory and well materials	$	5,323	$	5,802
	Prepaid expenses	4,267		4,215
	Other	97		97
		$	9,687	$	10,114
	Other assets:
	Assets of supplemental employee retirement plan (“SERP”)	4,216		4,123
	Other	95		95
		$	4,311	$	4,218
	Accounts payable and accrued liabilities:
	Trade accounts payable	$	121,891	$	174,496
	Drilling and other lease operating costs	47,131		68,842
	Royalties	25,971		27,883
	Compensation – related	4,313		9,197
	Interest	37,630		15,555
	Preferred stock dividends	6,067		6,067
	Other	2,063		10,187
		$	245,066	$	312,227
	Other liabilities:
	Deferred gains on sale of assets	$	90,463	$	90,569
	Firm transportation obligation	11,723		12,042
	Asset retirement obligations (“AROs”)	6,049		5,889
	Defined benefit pension obligations	1,565		1,753
	Postretirement health care benefit obligations	914		890
	Compensation – related	7,612		7,631
	Deferred compensation – SERP obligations and other	4,270		4,183
	Other	928		929
		$	123,524	$	123,886

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Summary of Long-Term Debt with Fixed Interest Rates	The following table summarizes the fair value of our long-term debt with fixed interest rates, which is estimated based on the published market prices for these debt obligations, as of the dates presented:
		As of
		31-Mar-15								31-Dec-14
		Fair				Carrying				Fair			Carrying
		Value				Value				Value			Value
	Senior Notes due 2019	$	271,500			$	300,000			$	234,000		$	300,000
	Senior Notes due 2020	720,750				775,000				620,000			775,000
		$	992,250			$	1,075,000			$	854,000		$	1,075,000
Assets and Liabilities Measured at Fair Value on Recurring Basis	The following tables summarize the valuation of those assets and liabilities as of the dates presented:
			As of March 31, 2015
			Fair Value				Fair Value Measurement Classification
	Description		Measurement				Level 1				Level 2			Level 3
	Assets:
	Commodity derivative assets – current		$	118,409			$	—			$	118,409		$	—
	Commodity derivative assets – noncurrent		31,844				—				31,844			—
	Assets of SERP		4,216				4,216				—			—
	Liabilities:
	Deferred compensation – SERP obligations		(4,269		)		(4,269		)		—			—
			As of December 31, 2014
			Fair Value				Fair Value Measurement Classification
	Description		Measurement				Level 1				Level 2			Level 3
	Assets:
	Commodity derivative assets – current		$	128,981			$	—			$	128,981		$	—
	Commodity derivative assets – noncurrent		35,897				—				35,897			—
	Assets of SERP		4,123				4,123				—			—
	Liabilities:
	Deferred compensation – SERP obligations		(4,178		)		(4,178		)		—			—

Shareholders_Equity_Tables

Shareholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Schedule of Stockholders Equity [Table Text Block]	The following tables summarize the components of our shareholders’ equity and the changes therein as of and for the three months ended March 31, 2015 and 2014:
		As of												As of
		December 31,						Dividends			All Other			March 31,
		2014			Net Loss			Declared 1			Changes 2			2015
	Preferred stock	$	4,044		$	—		$	—		$	—		$	4,044
	Common stock	529			—			—			—			529
	Paid-in capital	1,206,305			—			—			989			1,207,294
	Accumulated deficit	(535,176		)	(57,165		)	(6,067		)	—			(598,408		)
	Deferred compensation obligation	3,211			—			—			56			3,267
	Accumulated other comprehensive income 3	249			—			—			(11		)	238
	Treasury stock	(3,345		)	—			—			(55		)	(3,400		)
		$	675,817		$	(57,165	)	$	(6,067	)	$	979		$	613,564
		As of												As of
		December 31,						Dividends			All Other			March 31,
		2013			Net Income			Declared 1			Changes 2			2014
	Preferred stock	$	1,150		$	—		$	—		$	(2	)	$	1,148
	Common stock	466			—			—			2			468
	Paid-in capital	891,351			—			—			1,911			893,262
	Accumulated deficit	(104,180		)	19,225			(1,722		)	—			(86,677		)
	Deferred compensation obligation	2,792			—			—			105			2,897
	Accumulated other comprehensive income 3	267			—			—			25			292
	Treasury stock	(3,042		)	—			—			(105		)	(3,147		)
		$	788,804		$	19,225		$	(1,722	)	$	1,936		$	808,243
	_______________________
	1 Includes dividends of $150.00 per share on our 6% Series A Convertible Perpetual Preferred Stock (the “Series A Preferred Stock”) and $150.00 per share on our 6% Series B Convertible Perpetual Preferred Stock (the “Series B Preferred Stock”).
	2 Includes equity-classified share-based compensation of $990 and $825 for the three months ended March 31, 2015 and 2014.
	3 The Accumulated other comprehensive income (“AOCI”) is entirely attributable to our defined benefit pension and postretirement health care plans. The changes in the balance of AOCI for the three months ended March 31, 2015 and 2014 represent reclassifications from AOCI to net periodic benefit expense, a component of General and administrative expenses, of $(17) and $38 and are presented above net of taxes of $(6) and $13.

ShareBased_Compensation_Tables

Share-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Share-Based Compensation Expense	The following table summarizes our share-based compensation expense recognized for the periods presented:
		Three Months Ended
		March 31,
		2015		2014
	Equity-classified awards:
	Stock option awards	$	393	$	461
	Common, deferred and restricted stock and stock unit awards	597		364
		990		825
	Liability-classified awards	379		5,945
		$	1,369	$	6,770

Interest_Expense_Tables

Interest Expense (Tables)	3 Months Ended
	Mar. 31, 2015
Banking and Thrift [Abstract]
Interest Expense Net Disclosure	The following table summarizes the components of interest expense for the periods presented:
		Three Months Ended
		March 31,
		2015			2014
	Interest on borrowings and related fees	$	22,808		$	23,140
	Amortization of debt issuance costs	1,104			1,012
	Capitalized interest	(1,899		)	(1,618		)
		$	22,013		$	22,534

Earnings_per_Share_Tables

Earnings per Share (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Components of Calculation of Basic and Diluted Earnings Per Share	The following table provides a reconciliation of the components used in the calculation of basic and diluted earnings per share for the periods presented:
		Three Months Ended
		March 31,
		2015			2014
	Net income (loss)	$	(57,165	)	$	19,225
	Less: Preferred stock dividends	(6,067		)	(1,722		)
	Net income (loss) attributable to common shareholders – basic	$	(63,232	)	$	17,503
	Add: Preferred stock dividends 1	—			1,722
	Net income (loss) attributable to common shareholders – diluted	$	(63,232	)	$	19,225
	Weighted-average shares – basic	71,820			65,611
	Effect of dilutive securities 2	—			20,133
	Weighted-average shares – diluted	71,820			85,744
	_______________________
	1 Preferred stock dividends were excluded from diluted earnings per share for the three months ended March 31, 2015, as the assumed conversion of the outstanding preferred stock would have been anti-dilutive.
	2 For the three months ended March 31, 2015, approximately 31.3 million potentially dilutive securities, including the Series A Preferred Stock and Series B Preferred Stock, stock options and restricted stock units, had the effect of being anti-dilutive and were excluded from the calculation of diluted earnings per common share.

Divestitures_Additional_Inform

Divestitures - Additional Information (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Sep. 30, 2014	Mar. 31, 2014
Divestitures [Line Items]
Balance of deferred gain recognized in period	$0.10
South Texas Oil Gathering Sys. Development Rights
Divestitures [Line Items]
Proceeds from Sale of Intangible Assets		147
Sale Leaseback Transaction, Recognized Gain, Net		63
Sale Leaseback Transaction, Deferred Gain, Gross		84.1
Deferred gain on sale of assets, current component	3.4
Deferred gain on sale of assets, noncurrent component	80.7
Gain (Loss) on Disposition of Assets		147.1
South Texas Natural Gas Gathering Assets
Divestitures [Line Items]
Proceeds from Sale of Oil and Gas Property and Equipment			96
Gain (Loss) on Sale of Oil and Gas Property			67.3
Sale Leaseback Transaction, Recognized Gain, Net			56.7
Sale Leaseback Transaction, Deferred Gain, Gross			10.6
Deferred gain on sale of assets, current component	0.4
Deferred gain on sale of assets, noncurrent component	$9.70

Summary_of_Accounts_Receivable

Summary of Accounts Receivable (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Receivables [Abstract]
Customers	$57,125	$62,650
Joint interest partners	86,297	120,708
Other	6,787	6,549
Accounts Receivable, Gross, Current, Total	150,209	189,907
Less: Allowance for doubtful accounts	-280	-280
Accounts receivable, net of allowance for doubtful accounts	$149,929	$189,627

Accounts_Receivable_and_Major_2

Accounts Receivable and Major Customers - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
	Customer	Customer
Sales Revenue | Customer Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of major customers	3	4
Revenues, major customers	$47.90	$89.50
Concentration risk, percentage	66.00%	67.00%
Sales Revenue | Customer Concentration Risk | Major Customer 1
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenues, major customers	28	38.8
Concentration risk, percentage	38.00%	29.00%
Sales Revenue | Customer Concentration Risk | Major Customer 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenues, major customers	12	17.4
Concentration risk, percentage	17.00%	13.00%
Sales Revenue | Customer Concentration Risk | Major Customer 3
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenues, major customers	7.9	17.2
Concentration risk, percentage	11.00%	13.00%
Sales Revenue | Customer Concentration Risk | Major Customer 4
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenues, major customers		16.1
Concentration risk, percentage		12.00%
Accounts Receivable | Credit Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	48.00%		58.00%
Accounts receivable, major customers	$27.40		$36.10

Derivative_Instruments_Additio

Derivative Instruments - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative assets	150,253	$164,878
Commodity contracts
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative assets	150,300
Number of derivative counterparties	7
Commodity contracts | Credit Concentration Risk
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Number of derivative counterparties	5
Commodity contracts | Natural Gas
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Third-party quoted forward prices	NYMEX Henry Hub gas
Commodity contracts | Crude Oil
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Third-party quoted forward prices	West Texas Intermediate crude oil

Commodity_Derivative_Positions

Commodity Derivative Positions (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
	bbl
Settlements to be received (paid) in subsequent period
Derivative Instruments Related to Oil and Gas Production [Line Items]
Fair Value Asset	$13,061
Fair Value Liability	0
Crude Oil | Second quarter 2015
Derivative Instruments Related to Oil and Gas Production [Line Items]
Instrument	Collars
Notional Volume, per day	4,000
Weighted Average Price, Floor/Swap	87.5
Weighted Average Price, Ceiling	94.66
Fair Value Asset	10,045
Fair Value Liability	0
Crude Oil | Second quarter 2015 | Short Put
Derivative Instruments Related to Oil and Gas Production [Line Items]
Strike price on put options	70
Notional Volume, per day	6,000
Crude Oil | Third quarter 2015
Derivative Instruments Related to Oil and Gas Production [Line Items]
Instrument	Collars
Notional Volume, per day	3,000
Weighted Average Price, Floor/Swap	86.67
Weighted Average Price, Ceiling	94.73
Fair Value Asset	6,063
Fair Value Liability	0
Crude Oil | Fourth quarter 2015
Derivative Instruments Related to Oil and Gas Production [Line Items]
Instrument	Collars
Notional Volume, per day	3,000
Weighted Average Price, Floor/Swap	86.67
Weighted Average Price, Ceiling	94.73
Fair Value Asset	5,738
Fair Value Liability	0
Crude Oil | Second quarter 2015
Derivative Instruments Related to Oil and Gas Production [Line Items]
Instrument	Swaps
Notional Volume, per day	9,000
Derivative, Swap Type, Average Fixed Price	91.81
Fair Value Asset	27,053
Fair Value Liability	0
Crude Oil | Third and fourth quarters 2015 | Short Put
Derivative Instruments Related to Oil and Gas Production [Line Items]
Strike price on put options	70
Notional Volume, per day	5,000
Crude Oil | Third quarter 2015
Derivative Instruments Related to Oil and Gas Production [Line Items]
Instrument	Swaps
Notional Volume, per day	8,000
Derivative, Swap Type, Average Fixed Price	91.06
Fair Value Asset	23,139
Fair Value Liability	0
Crude Oil | Fourth quarter 2015
Derivative Instruments Related to Oil and Gas Production [Line Items]
Instrument	Swaps
Notional Volume, per day	8,000
Derivative, Swap Type, Average Fixed Price	91.06
Fair Value Asset	21,918
Fair Value Liability	0
Crude Oil | First quarter 2016
Derivative Instruments Related to Oil and Gas Production [Line Items]
Instrument	Swaps
Notional Volume, per day	4,000
Derivative, Swap Type, Average Fixed Price	88.12
Fair Value Asset	11,392
Fair Value Liability	0
Crude Oil | Second quarter 2016
Derivative Instruments Related to Oil and Gas Production [Line Items]
Instrument	Swaps
Notional Volume, per day	4,000
Derivative, Swap Type, Average Fixed Price	88.12
Fair Value Asset	10,933
Fair Value Liability	0
Crude Oil | Third quarter 2016
Derivative Instruments Related to Oil and Gas Production [Line Items]
Instrument	Swaps
Notional Volume, per day	4,000
Derivative, Swap Type, Average Fixed Price	88.12
Fair Value Asset	10,649
Fair Value Liability	0
Crude Oil | Fourth quarter 2016
Derivative Instruments Related to Oil and Gas Production [Line Items]
Instrument	Swaps
Notional Volume, per day	4,000
Derivative, Swap Type, Average Fixed Price	88.12
Fair Value Asset	10,262
Fair Value Liability	$0

Impact_of_Derivative_Activitie

Impact of Derivative Activities on Condensed Consolidated Statements of Income (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives	$22,867	($15,662)
Cash received (paid)	37,492	-3,057
Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Cash Received on Hedge	37,492	-3,057
Unrealized gains (losses)	($14,625)	($12,605)

Fair_Value_of_Derivative_Instr

Fair Value of Derivative Instruments on Condensed Consolidated Balance Sheets (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Derivatives, Fair Value [Line Items]
Derivative assets, current	$118,409	$128,981
Derivative assets, noncurrent	31,844	35,897
Derivative assets	150,253	164,878
Derivative liabilities, current	0	0
Derivative liabilities	0	0
Commodity contracts
Derivatives, Fair Value [Line Items]
Derivative assets	150,300
Commodity contracts | Derivative assets/liabilities - current
Derivatives, Fair Value [Line Items]
Derivative assets, current	118,409	128,981
Derivative liabilities, current	0	0
Commodity contracts | Derivative assets/liabilities - noncurrent
Derivatives, Fair Value [Line Items]
Derivative assets, noncurrent	31,844	35,897
Derivative liabilities, noncurrent	$0	$0

Summary_of_Property_and_Equipm

Summary of Property and Equipment (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Oil and gas properties:
Proved	$3,533,859	$3,390,482
Unproved	127,504	125,676
Total oil and gas properties	3,661,363	3,516,158
Other property and equipment	76,058	75,073
Total properties and equipment	3,737,421	3,591,231
Accumulated depreciation, depletion and amortization	-1,856,809	-1,766,133
Property and equipment, net (successful efforts method)	$1,880,612	$1,825,098

Summary_of_LongTerm_Debt_Detai

Summary of Long-Term Debt (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Debt Instrument [Line Items]
Revolving credit facility	$162,000	$35,000
Long-term Debt, gross	1,237,000	1,110,000
Unamortized Debt Issuance Expense	25,090	26,194
Long-term Debt, net	1,211,910	1,083,806
Revolving Credit Facility
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense	1,476	1,623
7.25% Senior Notes due 2019
Debt Instrument [Line Items]
Senior notes	300,000	300,000
Unamortized Debt Issuance Expense	3,928	4,131
8.50% Senior Notes due 2020
Debt Instrument [Line Items]
Senior notes	775,000	775,000
Unamortized Debt Issuance Expense	$19,686	$20,440

LongTerm_Debt_Additional_Infor

Long-Term Debt - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	7-May-15
Revolving Credit Facility
Debt Disclosure [Line Items]
Borrowing Base	$500,000,000
Maximum borrowing capacity	450,000,000
Optional additional borrowing	175,000,000
Letters of credit amount outstanding	1,800,000
Available borrowing capacity	286,200,000
Interest rate option two, base rate over federal funds effective rate	0.50%
Debt Instrument, Description of Variable Rate Basis	one-month Adjusted LIBOR
Interest rate option two, base rate over one-month Adjusted LIBOR	1.00%
Interest rate option two, applicable margin rate	1.75%
Commitment Fee Percentage at Period End	0.38%
Interest Rate at Period End	1.94%
Interest Rate at Period End, LIBOR component	0.19%
Revolving Credit Facility | Minimum
Debt Disclosure [Line Items]
Interest rate option one, applicable margin rate over Adjusted LIBOR	1.50%
Interest rate option two, applicable margin rate	0.50%
Commitment fees for undrawn credit facility	0.38%
Covenant requirement - Current ratio	1
Revolving Credit Facility | Maximum
Debt Disclosure [Line Items]
Interest rate option one, applicable margin rate over Adjusted LIBOR	2.50%
Interest rate option two, applicable margin rate	1.50%
Commitment fees for undrawn credit facility	0.50%
Revolving Credit Facility | Letter of Credit
Debt Disclosure [Line Items]
Maximum borrowing capacity	20,000,000
7.25% Senior Notes due 2019
Debt Disclosure [Line Items]
Senior Notes, Noncurrent	300,000,000	300,000,000
Annual interest rate	7.25%
7.25% Senior Notes due 2019 | Through March 31, 2016
Debt Disclosure [Line Items]
Redemption option, percent of principal	103.63%
7.25% Senior Notes due 2019 | Through December 31, 2016 (TTM)
Debt Disclosure [Line Items]
Redemption option, percent of principal	100.00%
8.50% Senior Notes due 2020
Debt Disclosure [Line Items]
Senior Notes, Noncurrent	775,000,000	775,000,000
Annual interest rate	8.50%
Subsequent Event | Revolving Credit Facility
Debt Disclosure [Line Items]
Borrowing Base			425,000,000
Maximum borrowing capacity			$425,000,000
Subsequent Event | Revolving Credit Facility | Through March 31, 2016 | Maximum
Debt Disclosure [Line Items]
Covenant requirement - Debt to EBITDAX ratio			4.75
Subsequent Event | Revolving Credit Facility | Through June 30, 2016 (TTM) | Maximum
Debt Disclosure [Line Items]
Covenant requirement - Debt to EBITDAX ratio			5.25
Subsequent Event | Revolving Credit Facility | Through December 31, 2016 (TTM) | Maximum
Debt Disclosure [Line Items]
Covenant requirement - Debt to EBITDAX ratio			5.5
Subsequent Event | Revolving Credit Facility | Through March 31, 2017 (TTM) | Maximum
Debt Disclosure [Line Items]
Covenant requirement - Debt to EBITDAX ratio			4.5
Covenant requirement - Senior Secured Debt to EBITDAX ratio			2.75
Subsequent Event | Revolving Credit Facility | Through maturity in September 2017 (TTM) | Maximum
Debt Disclosure [Line Items]
Covenant requirement - Debt to EBITDAX ratio			4
Debt to EBITDAX Ratio that precludes the payment of cash dividends on preferred stock			5

Income_Taxes_Details

Income Taxes (Details)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Effective tax rate (federal and state combined)	0.20%	42.60%
Federal statutory income tax rate	35.00%
Federal and state (combined) statutory income tax rate	35.70%

Restructuring_and_Exit_Activit2

Restructuring and Exit Activities - Additional Information (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Firm Transportation Obligation [Line Items]
Balance of obligation, noncurrent	$11,723,000	$12,042,000
Accounts Payable and Accrued Liabilities
Firm Transportation Obligation [Line Items]
Balance of obligation, current	2,800,000
Other Noncurrent Liabilities
Firm Transportation Obligation [Line Items]
Balance of obligation, noncurrent	$11,700,000

Summary_of_Restructuring_Relat

Summary of Restructuring Related Obligations (Detail) (USD $)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Firm Transportation Obligation [Roll Forward]
Balance at beginning of period	$14,790	$15,993	$15,993
Accretion	212	354	1,301
Cash payments, net	-523		-2,504
Balance at end of period	$14,479		$14,790

Components_of_Selected_Balance

Components of Selected Balance Sheet Accounts (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Other current assets:
Tubular inventory and well materials	$5,323	$5,802
Prepaid expenses	4,267	4,215
Other Assets, Miscellaneous, Current	97	97
Other Assets, Current	9,687	10,114
Other assets:
Assets of supplemental employee retirement plan (“SERP”)	4,216	4,123
Other	95	95
Other assets	4,311	4,218
Accounts payable and accrued liabilities:
Trade accounts payable	121,891	174,496
Drilling and other lease operating costs	47,131	68,842
Royalties	25,971	27,883
Compensation – related	4,313	9,197
Interest	37,630	15,555
Preferred stock dividends	6,067	6,067
Other	2,063	10,187
Accounts payable and accrued liabilities	245,066	312,227
Other liabilities:
Deferred gains on sale of assets	90,463	90,569
Firm transportation obligation	11,723	12,042
Asset retirement obligations (“AROs”)	6,049	5,889
Defined benefit pension obligations	1,565	1,753
Postretirement health care benefit obligations	914	890
Compensation-related	7,612	7,631
Deferred compensation – SERP obligations and other	4,270	4,183
Other	928	929
Other liabilities	$123,524	$123,886

Fair_Value_Summary_of_LongTerm

Fair Value Summary of Long-Term Debt with Fixed Interest Rates (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt with fixed interest rates	$992,250	$854,000
Fair Value | 7.25% Senior Notes due 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt with fixed interest rates	271,500	234,000
Fair Value | 8.50% Senior Notes due 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt with fixed interest rates	720,750	620,000
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt with fixed interest rates	1,075,000	1,075,000
Carrying Value | 7.25% Senior Notes due 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt with fixed interest rates	300,000	300,000
Carrying Value | 8.50% Senior Notes due 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt with fixed interest rates	$775,000	$775,000

Assets_and_Liabilities_Measure

Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Assets:
Commodity derivative assets – current	$118,409	$128,981
Commodity derivative assets – noncurrent	31,844	35,897
Liabilities:
Commodity derivative liabilities – current	0	0
Fair Value, Measurements, Recurring | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets:
Assets of SERP	4,216	4,123
Liabilities:
Deferred compensation – SERP obligations	-4,269	-4,178
Fair Value, Measurements, Recurring | Level 1
Assets:
Assets of SERP	4,216	4,123
Liabilities:
Deferred compensation – SERP obligations	-4,269	-4,178
Fair Value, Measurements, Recurring | Level 2
Assets:
Assets of SERP	0	0
Liabilities:
Deferred compensation – SERP obligations	0	0
Fair Value, Measurements, Recurring | Level 3
Assets:
Assets of SERP	0	0
Liabilities:
Deferred compensation – SERP obligations	0	0
Fair Value, Measurements, Recurring | Commodity contracts | Estimate of Fair Value, Fair Value Disclosure [Member]
Assets:
Commodity derivative assets – current	118,409	128,981
Commodity derivative assets – noncurrent	31,844	35,897
Fair Value, Measurements, Recurring | Commodity contracts | Level 1
Assets:
Commodity derivative assets – current	0	0
Commodity derivative assets – noncurrent	0	0
Fair Value, Measurements, Recurring | Commodity contracts | Level 2
Assets:
Commodity derivative assets – current	118,409	128,981
Commodity derivative assets – noncurrent	31,844	35,897
Fair Value, Measurements, Recurring | Commodity contracts | Level 3
Assets:
Commodity derivative assets – current	0	0
Commodity derivative assets – noncurrent	$0	$0

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2010
Commitments and Contingencies Disclosure [Line Items]
Asset retirement obligations	$6
Legal Reserve
Commitments and Contingencies Disclosure [Line Items]
Reserve established for contingency matters	0.3	0.9
Contract Drilling
Commitments and Contingencies Disclosure [Line Items]
Contract termination claims description	early termination provisions that would require us to pay penalties if we terminate the agreements prior to the end of their scheduled terms.
Loss on contract termination for default	16.2
Contractual obligation, balance of 2015	14.6
Contractual obligation, 2016	1.1
Coil Tubing Services
Commitments and Contingencies Disclosure [Line Items]
Contractual obligation, balance of 2015	4.8
Firm Transportation
Commitments and Contingencies Disclosure [Line Items]
Contractual obligation, balance of 2015	1.5
Firm Transportation | Through 2028
Commitments and Contingencies Disclosure [Line Items]
Contractual obligation, annual	1.1
Firm Transportation | Maximum
Commitments and Contingencies Disclosure [Line Items]
Contract term	13 years
Gas Gathering And Compression Services
Commitments and Contingencies Disclosure [Line Items]
Contractual obligation, balance of 2015	3.2
Contractual obligation, 2016	5
Crude Oil Gathering And Transportation Services
Commitments and Contingencies Disclosure [Line Items]
Contractual obligation, annual	$13.70

Shareholders_Equity_Rollforwar

Shareholders' Equity Rollforward (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Schedule of Stockholders' Equity [Line Items]
Share-based Compensation	$990		$825
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance	675,817		788,804
Net income (loss)	-57,165		19,225
Dividends Declared	-6,067	[1]
Dividends Declared			-1,722
All Other Changes	979	[2]	1,936	[2]
As of ending balance	613,564		808,243
Preferred stock dividends	-6,067		-1,722
Preferred stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance	4,044		1,150
All Other Changes	0	[2]	-2	[2]
As of ending balance	4,044		1,148
Common stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance	529		466
All Other Changes	0	[2]	2	[2]
As of ending balance	529		468
Paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance	1,206,305		891,351
All Other Changes	989	[2]	1,911	[2]
As of ending balance	1,207,294		893,262
Accumulated deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance	-535,176		-104,180
Net income (loss)	-57,165
As of ending balance	-598,408		-86,677
Preferred stock dividends	-6,067	[1]	-1,722	[1]
Deferred compensation obligation
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance	3,211		2,792
All Other Changes	56	[2]	105	[2]
As of ending balance	3,267		2,897
Accumulated other comprehensive income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance	249	[3]	267	[3]
All Other Changes	-11	[3]	25	[3]
As of ending balance	238	[3]	292	[3]
Treasury stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance	-3,345		-3,042
All Other Changes	-55	[2]	-105	[2]
As of ending balance	($3,400)		($3,147)
[1]	Includes dividends of $150.00 per share on our 6% Series A Convertible Perpetual Preferred Stock (the “Series A Preferred Stock”) and $150.00 per share on our 6% Series B Convertible Perpetual Preferred Stock (the “Series B Preferred Stock”).
[2]	Includes equity-classified share-based compensation of $990 and $825 for the three months ended March 31, 2015 and 2014.
[3]	The Accumulated other comprehensive income (“AOCI”) is entirely attributable to our defined benefit pension and postretirement health care plans. The changes in the balance of AOCI for the three months ended March 31, 2015 and 2014 represent reclassifications from AOCI to net periodic benefit expense, a component of General and administrative expenses, of $(17) and $38 and are presented above net of taxes of $(6) and $13.

Shareholders_Equity_Additional

Shareholders' Equity - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014
Class of Stock [Line Items]
Stockholders' Equity, Other	($979)	[1]	($1,936)	[1]
Other Comprehensive loss, pension and postretirements obligations, before tax	-17		38
Change in pension and postretirement obligations, net of tax	($6)		$13
Series A Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Shares Issued	7,945				7,945
Preferred stock dividends (in dollars per share)	$150
Preferred stock dividend rate	6.00%
Series B Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Shares Issued	32,500				32,500
Preferred stock dividends (in dollars per share)	$150
Preferred stock dividend rate	6.00%
[1]	Includes equity-classified share-based compensation of $990 and $825 for the three months ended March 31, 2015 and 2014.

Summary_of_ShareBased_Compensa

Summary of Share-Based Compensation Expense (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock option awards	$393,000	$461,000
Common, deferred, restricted and restricted unit awards	597,000	364,000
Share-based compensation	990,000	825,000
Allocated Share-based Compensation Expense	1,369,000	6,770,000
Equity-classified awards:
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation	990,000	825,000
Liability-classified awards
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Cash paid to settle liability-classified Share-based Award (PBRSUs)	1,500,000
Share-based compensation	$379,000	$5,945,000

Components_of_Interest_Expense

Components of Interest Expense (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Banking and Thrift [Abstract]
Interest on borrowings and related fees	$22,808	$23,140
Amortization of debt issuance costs	1,104	1,012
Capitalized interest	-1,899	-1,618
Interest expense	$22,013	$22,534

Components_of_Calculation_of_B

Components of Calculation of Basic and Diluted Earnings Per Share (Detail) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Earnings Per Share [Abstract]
Net income (loss)	($57,165)		$19,225
Less: Preferred stock dividends	-6,067		-1,722
Net income (loss) attributable to common shareholders, Basic	-63,232		17,503
Add: Preferred stock dividends	0	[1]	1,722
Net income (loss) attributable to common shareholders, Diluted	($63,232)		$19,225
Weighted-average shares – basic	71,820,000		65,611,000
Effect of dilutive securities	0	[2]	20,133,000
Weighted-average shares – diluted	71,820,000		85,744,000
Potentially dilutive securities with the effect of being anti-dilutive excluded from the calculation of diluted earnings per common share	31,300,000
[1]	Preferred stock dividends were excluded from diluted earnings per share for the three months ended March 31, 2015, as the assumed conversion of the outstanding preferred stock would have been anti-dilutive.
[2]	For the three months ended March 31, 2015, approximately 31.3 million potentially dilutive securities, including the Series A Preferred Stock and Series B Preferred Stock, stock options and restricted stock units, had the effect of being anti-dilutive and were excluded from the calculation of diluted earnings per common share.