Ranger Oil (ROCC) 10-Q 29 Oct 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Oct. 24, 2014
Document Documentand Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Trading Symbol	'PVA	'
Entity Registrant Name	'PENN VIRGINIA CORP	'
Entity Central Index Key	'0000077159	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	71,558,867

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended				9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Revenues	'		'		'		'
Crude oil	$118,716		$100,564		$336,382		$250,489
Natural gas liquids (NGLs)	9,790		8,212		27,200		22,652
Natural gas	13,354		12,872		47,859		40,465
Gain (Loss) on Disposition of Property Plant Equipment	63,520		-186		120,295		-479
Other, net	16		151		2,886		1,339
Total revenues	205,396		121,613		534,622		314,466
Operating expenses	'		'		'		'
Lease operating	15,296		8,457		38,103		24,891
Gathering, processing and transportation	4,893		3,039		11,380		9,598
Production and ad valorem taxes	7,690		6,597		22,505		19,532
General and administrative	11,527		12,677		43,055		39,276
Exploration	1,986		3,957		13,995		18,097
Depreciation, depletion and amortization	71,999		62,450		215,623		178,355
Asset Impairment Charges	6,084		132,224		123,992		132,224
Total operating expenses	119,475		229,401		468,653		421,973
Operating income (loss)	85,921		-107,788		65,969		-107,507
Other income (expense)	'		'		'		'
Interest expense	-21,953		-20,218		-67,716		-56,505
Gains (Losses) on Extinguishment of Debt	0		0		0		-29,157
Derivatives	66,457		-24,035		8,130		-23,208
Other	1,349		35		1,380		79
Income (loss) before income taxes	131,774		-152,006		7,763		-216,298
Income tax (expense) benefit	-42,113		53,106		339		75,577
Net income (loss)	89,661		-98,900		8,102		-140,721
Preferred stock dividends	-7,641	[1]	-1,725	[1]	-11,081	[1]	-5,175	[1]
Preferred Stock Conversions, Inducements	-888		0		-4,256		0
Net income (loss) attributable to common shareholders	$81,132		($100,625)		($7,235)		($145,896)
Net income (loss) per share:	'		'		'		'
Basic (in dollars per share)	$1.13		($1.54)		($0.11)		($2.38)
Diluted (in dollars per share)	$0.87		($1.54)		($0.11)		($2.38)
Weighted average shares outstanding – basic	71,536		65,465		67,909		61,272
Weighted average shares outstanding – diluted	103,606		65,465		67,909		61,272
[1]	Preferred stock dividends and payments to induce the conversion of preferred stock were excluded from diluted earnings per share for the nine months ended September 30, 2014 and the three and nine months ended September 30, 2013 as the assumed conversion of the outstanding preferred stock would have been anti-dilutive.

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Net income (loss)	$89,661	($98,900)	$8,102	($140,721)
Other comprehensive income:	'	'	'	'
Change in pension and postretirement obligations, net of tax of $14 and $40 in 2014 and $10 and $30 in 2013	25	18	74	56
Total Other Comprehensive Income (Loss), Net of Tax	25	18	74	56
Comprehensive income (loss)	$89,686	($98,882)	$8,176	($140,665)

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Change in pension and postretirement obligations, net of tax	$14	$10	$40	$30

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets	'	'
Cash and cash equivalents	$123,690	$23,474
Accounts receivable, net of allowance for doubtful accounts	188,683	194,403
Derivative assets	13,680	3,830
Deferred Tax Assets, Net of Valuation Allowance, Current	6,040	6,065
Other current assets	6,951	5,924
Total current assets	339,044	233,696
Property and equipment, net (successful efforts method)	2,342,903	2,237,304
Derivative assets	8,572	1,552
Other assets	31,860	34,535
Total assets	2,722,379	2,507,087
Current liabilities	'	'
Accounts payable and accrued liabilities	276,593	248,004
Derivative liabilities	1,045	10,141
Total current liabilities	277,638	258,145
Other liabilities	125,646	33,386
Derivative liabilities	0	0
Deferred income taxes	145,428	145,752
Long-term debt	1,075,000	1,281,000
Commitments and contingencies (Note 11)	'	'
Shareholders’ equity:	'	'
Preferred stock of $100 par value – 100,000 shares authorized; Series A – 7,945 and 11,500 shares issued as of September 30, 2014 and December 31, 2013 and Series B – 32,500 shares issued as of September 30, 2014, each with a redemption value of $10,000 per share	4,044	1,150
Common stock of $0.01 par value – 128,000,000 shares authorized; 71,557,951 and 65,306,748 shares issued as of September 30, 2014 and December 31, 2013, respectively	528	466
Paid-in capital	1,205,302	891,351
Accumulated deficit	-111,415	-104,180
Deferred compensation obligation	3,106	2,792
Accumulated other comprehensive income	341	267
Treasury stock – 246,352 and 233,063 shares of common stock, at cost, as of September 30, 2014 and December 31, 2013, respectively	-3,239	-3,042
Total shareholders’ equity	1,098,667	788,804
Total liabilities and shareholders’ equity	$2,722,379	$2,507,087

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
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	71,557,951	65,306,748
Treasury stock, shares	246,352	233,063
Series A Preferred Stock	'	'
Statement of Financial Position [Abstract]	'	'
Preferred stock, issued	7,945	11,500
Series B Preferred Stock	'	'
Statement of Financial Position [Abstract]	'	'
Preferred stock, issued	32,500	'

CONDENSED_CONSOLIDATED_STATEME3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities	'	'
Net income (loss)	$8,102	($140,721)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:	'	'
Loss on Extinguishment of Debt	0	29,157
Depreciation, depletion and amortization	215,623	178,355
Asset Impairment Charges	123,992	132,224
Accretion of firm transportation obligation	991	1,263
Derivative contracts:	'	'
Net losses (gains)	-8,130	23,208
Cash settlements, net	-17,836	1,625
Deferred income tax benefit	-339	-75,577
(Gain) loss on sales of assets, net	-120,295	479
Non-cash exploration expense	8,387	14,167
Non-cash interest expense	3,114	2,846
Share-based compensation (equity-classified)	2,638	4,781
Other, net	325	198
Changes in operating assets and liabilities, net	-16,122	52,829
Net cash provided by operating activities	200,450	224,834
Cash flows from investing activities	'	'
Payments to Acquire Businesses, Net of Cash Acquired	0	-358,239
Payments To Settle Obligations Assumed In Acquisition Net	33,712	-43,023
Capital expenditures – property and equipment	-545,031	-356,964
Proceeds from Sale of Productive Assets	311,913	653
Net cash used in investing activities	-199,406	-757,573
Cash flows from financing activities	'	'
Proceeds from Issuance of Convertible Preferred Stock	313,330	0
Payments Made To Induce Conversion Of Preferred Stock	-4,256	0
Proceeds from Issuance of Senior Long-term Debt	0	775,000
Repayments of Debt	0	-319,090
Proceeds from revolving credit facility borrowings	377,000	219,000
Repayment of revolving credit facility borrowings	-583,000	-91,000
Payments of Debt Issuance Costs	-151	-25,199
Dividends paid on preferred stock	-5,165	-5,137
Other, net	1,414	-164
Net cash provided by financing activities	99,172	553,410
Net increase in cash and cash equivalents	100,216	20,671
Cash and cash equivalents - beginning of period	23,474	17,650
Cash and cash equivalents - end of period	123,690	38,321
Cash paid for:	'	'
Interest	47,778	24,251
Income taxes	$100	$0

Organization

Organization	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Organization	'
	Organization
	Penn Virginia Corporation (“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	9 Months Ended
	Sep. 30, 2014
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, 2013. Operating results for the nine months ended September 30, 2014 are not necessarily indicative of the results that may be expected for the year ending December 31, 2014. Certain amounts for the 2013 period have been reclassified to conform to the current year presentation.
	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 on January 1, 2017. 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 for an increase in the borrowing base under our revolving credit facility (the “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.

Acquisitions_and_Divestitures

Acquisitions and Divestitures	9 Months Ended
	Sep. 30, 2014
Acquisitions and Divestitures [Abstract]	'
Acquisitions and Divestitures	'
	Acquisitions and Divestitures
	Acquisitions
	Undeveloped Eagle Ford Acreage
	In July 2014, we entered into a definitive agreement to acquire approximately 13,125 gross (11,660 net) acres in the Eagle Ford in Lavaca County, Texas. The transaction closed in August 2014 for a purchase price of $45.6 million, of which $34.9 million was paid at closing and the balance of $10.7 million will be paid over the next three years as a drilling carry.
	EF Acquisition
	On April 24, 2013 (the “Acquisition Date”), we acquired producing properties and undeveloped leasehold interests in the Eagle Ford (the “EF Acquisition”). The EF Acquisition was originally valued at $401 million with an effective date of January 1, 2013 (the “Effective Date”). On the Acquisition Date, we paid approximately $380 million in cash, including approximately $19 million of initial purchase price adjustments related to the period from the Effective Date to the closing, and issued to Magnum Hunter Resources Corporation (“MHR”), the seller in the EF Acquisition, 10 million shares of our common stock (the “Shares”) with a fair value of $4.23 per share. Shortly after the closing, certain of our joint interest partners exercised preferential rights related to the EF Acquisition. We received approximately $21 million from the exercise of these rights, which was recorded as a decrease to our purchase price for the EF Acquisition. Subsequent to the Acquisition Date and through December 31, 2013, we paid a total of $22.5 million, net to settle working capital adjustments assumed in the EF Acquisition.
	Commencing December 2013, we were involved in arbitration with MHR. The arbitration related to disputes we had with MHR regarding contractual adjustments to the purchase price for the EF Acquisition and suspense funds that we believed MHR was obligated to transfer to us. In July 2014, we received the arbitrator’s determination, which required MHR to pay us a total of $35.1 million, including purchase price adjustments, revenue suspense funds due to partners and royalty owners and interest ($1.3 million) on the funds since the Acquisition Date. Payment of the arbitration settlement was made by MHR in August 2014.
	We accounted for the EF Acquisition by applying the acquisition method of accounting as of the Acquisition Date. The following table represents the fair values assigned to the net assets acquired and the consideration paid:
	Assets
	Oil and gas properties – proved	$	267,688
	Oil and gas properties – unproved	119,709
	Accounts receivable, net	107,345
	Other assets	2,068
		496,810
	Liabilities
	Accounts payable and accrued expenses	94,771
	Other liabilities	1,500
		96,271
	Net assets acquired	$	400,539
	Cash, net of amounts received for preferential rights	$	358,239
	Fair value of the Shares issued to MHR	42,300
	Consideration paid	$	400,539
	The fair values of the acquired net assets were measured using valuation techniques that convert future cash flows to a single discounted amount. Significant inputs to valuation of oil and natural gas properties include estimates of: (i) reserves, (ii) future operating and development costs, (iii) future commodity prices, (iv) future cash flows and (v) a market-based weighted-average cost of capital. Because many of these inputs are not observable, we have classified the fair value estimates as level 3 inputs as that term is defined in U.S. GAAP.
	The results of operations attributable to the EF Acquisition have been included in our Condensed Consolidated Financial Statements from the Acquisition Date. The following table presents unaudited summary pro forma financial information for the periods presented assuming the EF Acquisition and the related financing occurred as of January 1, 2012. The pro forma financial information does not purport to represent what our results of operations would have been if the EF Acquisition had occurred as of this date or the results of operations for any future periods.
		Nine Months Ended
		30-Sep-13
	Total revenues	$	344,412
	Net loss attributable to common shareholders	$	(124,172	)
	Loss per share – basic and diluted	$	(1.84	)
	Divestitures
	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 $147.1 million, net of transaction costs. Concurrent with the sale, we entered into long-term agreements with Republic to provide us gathering and intermediate pipeline transportation services for a substantial portion of our current and 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 2015. The deferred gain is included as a component of Other liabilities on our Condensed Consolidated Balance Sheets.
	In July 2014, we sold our Selma Chalk assets in Mississippi for proceeds of $67.9 million, net of transaction costs and customary closing adjustments. An impairment charge of $117.9 million was recognized in the three months ended June 30, 2014 with respect to these assets.
	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 and $0.3 million of the deferred gain during the three and nine months ended September 30, 2014, respectively. As of September 30, 2014, $0.4 million of the remaining deferred gain is included as a component of Accounts payable and accrued expenses and $9.9 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	9 Months Ended
	Sep. 30, 2014
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
		September 30,			December 31,
		2014			2013
	Customers	$	97,139		$	93,288
	Joint interest partners	84,112			76,199
	Other 1	7,608			25,538
		188,859			195,025
	Less: Allowance for doubtful accounts	(176		)	(622		)
		$	188,683		$	194,403
	______________________
	1 The balance as of December 31, 2013 was comprised substantially of amounts due from MHR and other parties for purchase price adjustments attributable to the EF Acquisition, which were received in August 2014.
	For the nine months ended September 30, 2014, four customers accounted for $267.0 million, or approximately 65%, of our consolidated product revenues. The revenues generated from these customers during the nine months ended September 30, 2014 were $86.2 million, $72.5 million, $55.8 million and $52.6 million or 21%, 18%, 13% and 13% of the consolidated total, respectively. As of September 30, 2014, $65.2 million, or approximately 67% of our consolidated accounts receivable from customers was related to these customers. For the nine months ended September 30, 2013, three customers accounted for $124.1 million, or approximately 40% of our consolidated product revenues. The revenues generated from these customers during the nine months ended September 30, 2013 were $51.9 million, $37.7 million and $34.5 million or approximately 17%, 12% and 11% of the consolidated total, respectively. As of December 31, 2013, $34.8 million, or approximately 37% 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	9 Months Ended
	Sep. 30, 2014
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 and, from time to time, the volatility in interest rates attributable to our debt instruments. Our derivative instruments are not formally designated as hedges.
	Commodity Derivatives
	We utilize collars, swaps and swaptions, 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. A swaption contract gives our counterparties the option to enter into a fixed price swap with us at a future date. If the forward commodity price for the term of the swaption is higher than or equal to the swaption strike price on the exercise date, the counterparty will exercise its option to enter into a fixed price swap at the swaption strike price for the term of the swaption, at which point the contract functions as a fixed price swap. If the forward commodity price for the term of the swaption is lower than the swaption strike price on the exercise date, the option expires and no fixed price swap is in effect.
	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 September 30, 2014:
				Average
				Volume Per			Weighted Average Price						Fair Value
		Instrument		Day			Floor/Swap				Ceiling		Asset				Liability
	Crude Oil:			(barrels)			($/barrel)
	Fourth quarter 2014	Collars		2,000			$	90			94.33		$	264			$	—
	First quarter 2015	Collars		4,000			$	87.5			94.66		649				—
	Second quarter 2015	Collars		4,000			$	87.5			94.66		947				—
	Third quarter 2015	Collars		3,000			$	86.67			94.73		770				—
	Fourth quarter 2015	Collars		3,000			$	86.67			94.73		838				—
	Fourth quarter 2014	Swaps		11,000			$	93.45					3,301				40
	First quarter 2015	Swaps		9,000			$	91.81					2,197				—
	Second quarter 2015	Swaps		9,000			$	91.81					2,835				—
	Third quarter 2015	Swaps		8,000			$	91.06					2,352				—
	Fourth quarter 2015	Swaps		8,000			$	91.06					2,432				—
	First quarter 2016	Swaps		3,000			$	90.84					1,176				—
	Second quarter 2016	Swaps		3,000			$	90.84					1,284				—
	Third quarter 2016	Swaps		3,000			$	90.84					1,395				—
	Fourth quarter 2016	Swaps		3,000			$	90.84					1,447				—
	First quarter 2015	Swaptions		1,000			$	88					—				252
	Second quarter 2015	Swaptions		1,000			$	88					—				251
	Third quarter 2015	Swaptions		1,000			$	88					—				251
	Fourth quarter 2015	Swaptions		1,000			$	88					—				251
	Natural Gas:			(in MMBtu)			($/MMBtu)
	Fourth quarter 2014	Swaps		5,000			$	4.5					185				—
	First quarter 2015	Swaps		5,000			$	4.5					129				—
	Settlements to be received in subsequent period												52				—
	Interest Rate Swaps
	During the nine months ended September 30, 2014 and 2013, we had no interest rate derivative instruments in place.
	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								Nine Months Ended
		September 30,								September 30,
		2014				2013				2014				2013
	Impact by contract type:
	Commodity contracts	$	66,457			$	(24,035	)		$	8,130			$	(23,208	)
	Interest rate contracts	—				—				—				—
		$	66,457			$	(24,035	)		$	8,130			$	(23,208	)
	Cash settlements and gains (losses):
	Cash (paid) received for:
	Commodity contract settlements	$	(7,557	)		$	(4,165	)		$	(17,836	)		$	1,625
	Interest rate contract settlements	—				—				—				—
		(7,557		)		(4,165		)		(17,836		)		1,625
	Gains (losses) attributable to:
	Commodity contracts	74,014				(19,870		)		25,966				(24,833		)
	Interest rate contracts	—				—				—				—
		74,014				(19,870		)		25,966				(24,833		)
		$	66,457			$	(24,035	)		$	8,130			$	(23,208	)
	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
				30-Sep-14								31-Dec-13
				Derivative				Derivative				Derivative				Derivative
	Type		Balance Sheet Location	Assets				Liabilities				Assets				Liabilities
	Commodity contracts		Derivative assets/liabilities – current	$	13,680			$	1,045			$	3,830			$	10,141
	Interest rate contracts		Derivative assets/liabilities – current	—				—				—				—
				13,680				1,045				3,830				10,141
Commodity contracts		Derivative assets/liabilities – noncurrent	8,572				—				1,552				—
Interest rate contracts		Derivative assets/liabilities – noncurrent	—				—				—				—
			8,572				—				1,552				—
			$	22,252			$	1,045			$	5,382			$	10,141
As of September 30, 2014, we reported a commodity derivative asset of $22.3 million. The contracts associated with this position are with seven counterparties, all of which are investment grade financial institutions, and are substantially concentrated with two 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	9 Months Ended
	Sep. 30, 2014
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
		September 30,			December 31,
		2014			2013
	Oil and gas properties:
	Proved	$	450,601		$	460,255
	Unproved	137,464			101,520
	Total oil and gas properties	588,065			561,775
	Other property and equipment:
	Wells, equipment and facilities	2,743,466			2,593,700
	Support equipment	23,153			21,513
	Total other property and equipment	2,766,619			2,615,213
		3,354,684			3,176,988
	Accumulated depreciation, depletion and amortization	(1,011,781		)	(939,684		)
		$	2,342,903		$	2,237,304
	In the three months ended September 30, 2014, we recognized an oil and gas asset impairment of $6.1 million in connection with an exploration prospect drilled in the Mid-Continent region. In June 2014, we entered into a definitive agreement to sell our Selma Chalk assets in Mississippi. An impairment charge of $117.9 million was recognized in the three months ended June 30, 2014 to write these assets down to fair value. The sale was completed in July 2014.

LongTerm_Debt

Long-Term Debt	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Long-Term Debt	'
	Long-Term Debt
	The following table summarizes our long-term debt as of the dates presented:
		As of
		September 30,		December 31,
		2014		2013
	Revolving credit facility	$	—	$	206,000
	Senior notes due 2019	300,000		300,000
	Senior notes due 2020	775,000		775,000
		$	1,075,000	$	1,281,000
	Revolving Credit Facility
	The Revolver provides for a $450 million revolving commitment. The Revolver has an accordion feature that allows us to increase the commitment by up to an additional $150 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. Upon the closing of the sale of our Selma Chalk assets in the third quarter of 2014, the borrowing base was reduced from $475 million to $437.5 million. In October 2014, the borrowing base was increased to $500 million in connection with the regular semi-annual redetermination. The next semi-annual redetermination is scheduled for May 2015. In addition, the Revolver was amended to clarify the requirements with respect to pro forma treatment of material acquisitions and dispositions for purposes of the leverage ratio covenant under the Revolver. 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 $1.7 million outstanding as of September 30, 2014. As of September 30, 2014, our available borrowing capacity under the Revolver was $435.8 million.
	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 September 30, 2014, the actual interest rate on the outstanding borrowings under the Revolver was 1.6875% which is derived from an Adjusted LIBOR rate of 0.1875% plus an applicable margin of 1.50%. 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 September 30, 2014, 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. The leverage ratio of total net debt to EBITDAX, a non-GAAP financial measure defined in the Revolver, may not exceed 4.25 to 1.0 through December 31, 2014 and then 4.0 to 1.0 through maturity.
	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. Beginning in April 2015, 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 June 15 and December 15 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.
	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	9 Months Ended
	Sep. 30, 2014
Income Tax Disclosure [Abstract]	'
Income Tax Disclosure [Text Block]	'
	Income Taxes
	We recognized an income tax benefit for the nine months ended September 30, 2014 at an effective rate of 4.4%. The annual effective tax rate applied to the nine months ended September 30, 2014 includes federal taxes at the statutory rate of 35%; however, the federal effect is almost entirely offset by state income tax effects, which include a deferred tax benefit associated with an expected decrease in the effective state income tax rate in future periods. The benefit is due primarily to a shift in the source of our expected future state taxable income as a result of the recent sale of all of our properties in Mississippi. Our effective tax rate also reflects the adverse effect of losses incurred in certain jurisdictions for which we may not realize a tax benefit and have therefore recorded a valuation allowance against the related deferred tax asset.
	Due to the losses incurred during the three and nine months ended September 30, 2013, we recognized income tax benefits at an effective rate of 34.9%. The income tax benefit included the effect of deferred tax asset valuation allowance due primarily to the inability to recognize tax benefits for certain state net operating losses.

Additional_Balance_Sheet_Detai

Additional Balance Sheet Detail	9 Months Ended
	Sep. 30, 2014
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
		September 30,		December 31,
		2014		2013
	Other current assets:
	Tubular inventory and well materials	$	3,946	$	2,271
	Prepaid expenses	2,905		3,653
	Other	100		—
		$	6,951	$	5,924
	Other assets:
	Debt issuance costs	$	27,277	$	30,239
	Assets of supplemental employee retirement plan (“SERP”)	4,021		3,734
	Other	562		562
		$	31,860	$	34,535
	Accounts payable and accrued liabilities:
	Trade accounts payable	$	105,888	$	120,278
	Drilling and other lease operating costs	56,585		51,529
	Royalties	46,672		39,929
	Compensation – related	10,947		8,584
	Interest	37,417		15,718
	Preferred stock dividends	7,638		1,725
	Other	11,446		10,241
		$	276,593	$	248,004
	Other liabilities:
	Deferred gains on sale of assets	$	90,675	$	—
	Firm transportation obligation	12,352		13,245
	Asset retirement obligations (“AROs”)	5,808		6,437
	Defined benefit pension obligations	1,461		1,579
	Postretirement health care benefit obligations	1,154		1,023
	Deferred compensation – SERP obligations and other	4,130		3,883
	Other	10,066		7,219
		$	125,646	$	33,386

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2014
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 September 30, 2014, 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
		30-Sep-14								31-Dec-13
		Fair				Carrying				Fair				Carrying
		Value				Value				Value				Value
	Senior Notes due 2019	$	300,750			$	300,000			$	307,500			$	300,000
	Senior Notes due 2020	821,500				775,000				837,969				775,000
		$	1,122,250			$	1,075,000			$	1,145,469			$	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 September 30, 2014
			Fair Value				Fair Value Measurement Classification
	Description		Measurement				Level 1				Level 2				Level 3
	Assets:
	Commodity derivative assets – current		$	13,680			$	—			$	13,680			$	—
	Commodity derivative assets – noncurrent		8,572				—				8,572				—
	Assets of SERP		4,021				4,021				—				—
	Liabilities:
	Commodity derivative liabilities – current		(1,045		)		—				(1,045		)		—
	Commodity derivative liabilities – noncurrent		—				—				—				—
	Deferred compensation – SERP obligations		(4,125		)		(4,125		)		—				—
			As of December 31, 2013
			Fair Value				Fair Value Measurement Classification
	Description		Measurement				Level 1				Level 2				Level 3
	Assets:
	Commodity derivative assets – current		$	3,830			$	—			$	3,830			$	—
	Commodity derivative assets – noncurrent		1,552				—				1,552				—
	Assets of SERP		3,734				3,734				—				—
	Liabilities:
	Commodity derivative liabilities – noncurrent		(10,141		)		—				(10,141		)		—
	Deferred compensation – SERP obligations		(3,879		)		(3,879		)		—				—
	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 nine months ended September 30, 2014 and 2013.
	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	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	Commitments and Contingencies
	Drilling and Completion Commitments
	We have agreements to purchase oil and gas well drilling and well completion services from third parties with remaining terms of up to 11 months. The well drilling 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 September 30, 2014, the penalty amount would have been $24.4 million had we terminated our agreements on that date.
	Other Commitments
	We have contracts that provide firm transportation capacity rights for specified volumes per day on various pipeline systems with terms that range from 1 to 15 years. The contracts require us to pay transportation demand charges regardless of the amount of pipeline capacity we use. We may sell excess capacity to third parties at our discretion.
	We have 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 requirements for 2014 through 2016 are $3.7 million, $4.2 million and $5.0 million, respectively.
	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 2015 when construction of the gathering, transportation and delivery point facilities 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 $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 remains outstanding as of September 30, 2014. As of September 30, 2014, we also have AROs of approximately $5.8 million attributable to the plugging of abandoned wells.

Shareholders_Equity

Shareholders' Equity	9 Months Ended
	Sep. 30, 2014
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 nine months ended September 30, 2014 and 2013:
		As of						Preferred								As of
		December 31,						Stock		Dividends			All Other			September 30,
		2013			Net Income			Offering		Declared 1			Changes 2			2014
	Preferred stock 3	$	1,150		$	—		$	3,250	$	—		$	(356	)	$	4,044
	Common stock 3	466			—			—		—			62			528
	Paid-in capital 3	891,351			—			310,080		—			3,871			1,205,302
	Accumulated deficit 3	(104,180		)	8,102			—		(11,081		)	(4,256		)	(111,415		)
	Deferred compensation obligation	2,792			—			—		—			314			3,106
	Accumulated other comprehensive income 4	267			—			—		—			74			341
	Treasury stock	(3,042		)	—			—		—			(197		)	(3,239		)
		$	788,804		$	8,102		$	313,330	$	(11,081	)	$	(488	)	$	1,098,667
		As of						Preferred								As of
		December 31,						Stock		Dividends			All Other			September 30,
		2012			Net Loss			Offering		Declared 1			Changes 2			2013
	Preferred stock	$	1,150		$	—		$	—	$	—		$	—		$	1,150
	Common stock 5	364			—			—		—			101			465
	Paid-in capital 5	849,046			—			—		—			46,404			895,450
	Retained earnings	45,790			(140,721		)	—		(5,175		)	—			(100,106		)
	Deferred compensation obligation	3,111			—			—		—			(384		)	2,727
	Accumulated other comprehensive loss 4	(982		)	—			—		—			56			(926		)
	Treasury stock	(3,363		)	—			—		—			386			(2,977		)
		$	895,116		$	(140,721	)	$	—	$	(5,175	)	$	46,563		$	795,783
	______________________
	1 Includes dividends of $450.00 per share on our 6% Series A Convertible Perpetual Preferred Stock (the “Series A Preferred Stock”) and $198.33 per share on our 6% Series B Convertible Perpetual Preferred Stock (the “Series B Preferred Stock”).
	2 Includes equity-classified share-based compensation of $2,638 and $4,781 for the nine months ended September 30, 2014 and 2013.
	3 A total of 3,555 shares, or 355,482 depositary shares, of the Series A Preferred Stock were converted into 5,924,706 shares of our common stock during the nine months ended September 30, 2014. We made payments of $4.3 million to induce the conversion of 3,527 of these shares.
	4 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 nine months ended September 30, 2014 and 2013 represent reclassifications from AOCI to net periodic benefit expense, a component of General and administrative expenses, of $114 and $86 and are presented above net of taxes of $40 and $30.
	5 Includes the Shares, with a fair value of $4.23 per share, that were issued to MHR in connection with the EF Acquisition.
	In June 2014, we completed a private offering of 3,250,000 depositary shares each representing a 1/100th interest in a share, or 32,500 shares, of our Series B Preferred Stock, which provided approximately $313 million of proceeds, net of underwriting fees and issuance costs.
	The annual dividend on each share of the Series B Preferred Stock is 6.00% per annum on the liquidation preference of $10,000 per share and is payable quarterly, in arrears, on each of January 15, April 15, July 15 and October 15 of each year. We may, at our option, pay dividends in cash, common stock or a combination thereof.
	Each share of the Series B Preferred Stock is convertible, at the option of the holder, into a number of shares of our common stock equal to the liquidation preference of $10,000 divided by the conversion price, which is initially $18.34 per share and is subject to specified anti-dilution adjustments. The initial conversion rate is equal to 545.17 shares of our common stock for each share of the Series B Preferred Stock. The initial conversion price represents a premium of 30 percent relative to the last reported sales price of $14.11 per common share prior to the offering of the Series B Preferred Stock. The Series B Preferred Stock is not redeemable by us or the holders at any time. At any time on or after July 15, 2019, we may, at our option, cause all outstanding shares of the Series B Preferred Stock to be automatically converted into shares of our common stock at the then-applicable conversion price if the closing sale price of our common stock exceeds 130% of the then-applicable conversion price for a specified period prior to conversion. If a holder elects to convert shares of the Series B Preferred Stock upon the occurrence of certain specified fundamental changes, we may be obligated to deliver an additional number of shares above the applicable conversion rate to compensate the holder for lost option value.

ShareBased_Compensation

Share-Based Compensation	9 Months Ended
	Sep. 30, 2014
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 our 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 our 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					Nine Months Ended
		September 30,					September 30,
		2014			2013		2014		2013
	Equity-classified awards:
	Stock option awards	$	403		$	612	$	1,193	$	2,518
	Common, deferred and restricted stock and stock unit awards	584			398		1,445		2,263
		987			1,010		2,638		4,781
	Liability-classified awards	(360		)	1,095		6,632		1,544
		$	627		$	2,105	$	9,270	$	6,325

Restructuring_and_Exit_Activit

Restructuring and Exit Activities	9 Months Ended
	Sep. 30, 2014
Restructuring and Related Activities [Abstract]	'
Restructuring and Exit Activities	'
	Restructuring and Exit Activities
	We have a contractual commitment 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 activity summarized below includes contractual payments on our obligations as well as the recognition of accretion expense and adjustments associated with changes in estimates.
	The following table summarizes our restructuring and exit activity-related obligations and the changes therein for the periods presented:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
	Balance at beginning of period	$	15,559		$	16,677		$	16,090		$	17,263
	Employee, office and other costs accrued, net	18			2			27			5
	Accretion of firm transportation obligation	407			410			991			1,263
	Cash payments, net	(857		)	(705		)	(1,981		)	(2,147		)
	Balance at end of period	$	15,127		$	16,384		$	15,127		$	16,384
	Restructuring charges are included in the General and administrative caption on our Condensed Consolidated Statements of Operations. The accretion of the firm transportation obligation, net of any recoveries from the periodic sale of our contractual capacity, is charged as an offset to Other revenue.
	The current portion of our restructuring and exit cost obligations is included in the Accounts payable and accrued liabilities caption and the noncurrent portion is included in the Other liabilities caption on our Condensed Consolidated Balance Sheets. As of September 30, 2014, $2.7 million of the total obligations are classified as current while the remaining $12.4 million are classified as noncurrent.

Interest_Expense

Interest Expense	9 Months Ended
	Sep. 30, 2014
Banking and Thrift [Abstract]	'
Interest Expense	'
	Interest Expense
	The following table summarizes the components of interest expense for the periods presented:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
	Interest on borrowings and related fees	$	22,559		$	22,754		$	69,477		$	57,239
	Accretion of original issue discount 1	—			—			—			431
	Amortization of debt issuance costs	1,063			961			3,114			2,415
	Capitalized interest	(1,669		)	(3,497		)	(4,875		)	(3,580		)
		$	21,953		$	20,218		$	67,716		$	56,505
	_____________________
	1 Represents accretion of original issue discount attributable to our 10.375% Senior Notes due 2016 that were retired in 2013.

Earnings_per_Share

Earnings per Share	9 Months Ended
	Sep. 30, 2014
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						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
	Net income (loss)	$	89,661		$	(98,900	)	$	8,102		$	(140,721	)
	Less: Preferred stock dividends	(7,641		)	(1,725		)	(11,081		)	(5,175		)
	Less: Induced conversion of preferred stock	(888		)	—			(4,256		)	—
	Net income (loss) attributable to common shareholders – basic	$	81,132		$	(100,625	)	$	(7,235	)	$	(145,896	)
	Add: Preferred stock dividends 1	7,641			—			—			—
	Add: Induced conversion of preferred stock 1	888			—			—			—
	Net income (loss) attributable to common shareholders – diluted	$	89,661		$	(100,625	)	$	(7,235	)	$	(145,896	)
	Weighted-average shares – basic	71,536			65,465			67,909			61,272
	Effect of dilutive securities 2	32,070			—			—			—
	Weighted-average shares – diluted	103,606			65,465			67,909			61,272
	_______________________
	1 Preferred stock dividends and payments to induce the conversion of preferred stock were excluded from diluted earnings per share for the nine months ended September 30, 2014 and the three and nine months ended September 30, 2013 as the assumed conversion of the outstanding preferred stock would have been anti-dilutive.
	2 For the nine months ended September 30, 2014, approximately 24.9 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. For the three and nine months ended September 30, 2013, approximately 19.2 million and less than 0.1 million, respectively, potentially dilutive securities, including the Series A 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)	9 Months Ended
	Sep. 30, 2014
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, 2013. Operating results for the nine months ended September 30, 2014 are not necessarily indicative of the results that may be expected for the year ending December 31, 2014. Certain amounts for the 2013 period have been reclassified to conform to the current year presentation.
	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 on January 1, 2017. 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 for an increase in the borrowing base under our revolving credit facility (the “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.

Acquisition_and_Divestitures_T

Acquisition and Divestitures (Tables)	9 Months Ended
	Sep. 30, 2014
Acquisitions and Divestitures [Abstract]	'
Business Acquisition, Purchase Price Allocation [Table Text Block]	'
	The following table represents the fair values assigned to the net assets acquired and the consideration paid:
	Assets
	Oil and gas properties – proved	$	267,688
	Oil and gas properties – unproved	119,709
	Accounts receivable, net	107,345
	Other assets	2,068
		496,810
	Liabilities
	Accounts payable and accrued expenses	94,771
	Other liabilities	1,500
		96,271
	Net assets acquired	$	400,539
	Cash, net of amounts received for preferential rights	$	358,239
	Fair value of the Shares issued to MHR	42,300
	Consideration paid	$	400,539
Business Acquisition, Pro Forma Information [Table Text Block]	'
	The results of operations attributable to the EF Acquisition have been included in our Condensed Consolidated Financial Statements from the Acquisition Date. The following table presents unaudited summary pro forma financial information for the periods presented assuming the EF Acquisition and the related financing occurred as of January 1, 2012. The pro forma financial information does not purport to represent what our results of operations would have been if the EF Acquisition had occurred as of this date or the results of operations for any future periods.
		Nine Months Ended
		30-Sep-13
	Total revenues	$	344,412
	Net loss attributable to common shareholders	$	(124,172	)
	Loss per share – basic and diluted	$	(1.84	)

Accounts_Receivable_and_Major_1

Accounts Receivable and Major Customers (Tables)	9 Months Ended
	Sep. 30, 2014
Receivables [Abstract]	'
Summary of Accounts Receivable	'
	The following table summarizes our accounts receivable by type as of the dates presented:
		As of
		September 30,			December 31,
		2014			2013
	Customers	$	97,139		$	93,288
	Joint interest partners	84,112			76,199
	Other 1	7,608			25,538
		188,859			195,025
	Less: Allowance for doubtful accounts	(176		)	(622		)
		$	188,683		$	194,403
	______________________
	1 The balance as of December 31, 2013 was comprised substantially of amounts due from MHR and other parties for purchase price adjustments attributable to the EF Acquisition, which were received in August 2014.

Derivative_Instruments_Tables

Derivative Instruments (Tables)	9 Months Ended
	Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Commodity Derivative Positions	'
	The following table sets forth our commodity derivative positions as of September 30, 2014:
				Average
				Volume Per			Weighted Average Price						Fair Value
		Instrument		Day			Floor/Swap				Ceiling		Asset				Liability
	Crude Oil:			(barrels)			($/barrel)
	Fourth quarter 2014	Collars		2,000			$	90			94.33		$	264			$	—
	First quarter 2015	Collars		4,000			$	87.5			94.66		649				—
	Second quarter 2015	Collars		4,000			$	87.5			94.66		947				—
	Third quarter 2015	Collars		3,000			$	86.67			94.73		770				—
	Fourth quarter 2015	Collars		3,000			$	86.67			94.73		838				—
	Fourth quarter 2014	Swaps		11,000			$	93.45					3,301				40
	First quarter 2015	Swaps		9,000			$	91.81					2,197				—
	Second quarter 2015	Swaps		9,000			$	91.81					2,835				—
	Third quarter 2015	Swaps		8,000			$	91.06					2,352				—
	Fourth quarter 2015	Swaps		8,000			$	91.06					2,432				—
	First quarter 2016	Swaps		3,000			$	90.84					1,176				—
	Second quarter 2016	Swaps		3,000			$	90.84					1,284				—
	Third quarter 2016	Swaps		3,000			$	90.84					1,395				—
	Fourth quarter 2016	Swaps		3,000			$	90.84					1,447				—
	First quarter 2015	Swaptions		1,000			$	88					—				252
	Second quarter 2015	Swaptions		1,000			$	88					—				251
	Third quarter 2015	Swaptions		1,000			$	88					—				251
	Fourth quarter 2015	Swaptions		1,000			$	88					—				251
	Natural Gas:			(in MMBtu)			($/MMBtu)
	Fourth quarter 2014	Swaps		5,000			$	4.5					185				—
	First quarter 2015	Swaps		5,000			$	4.5					129				—
	Settlements to be received in subsequent period												52				—
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								Nine Months Ended
		September 30,								September 30,
		2014				2013				2014				2013
	Impact by contract type:
	Commodity contracts	$	66,457			$	(24,035	)		$	8,130			$	(23,208	)
	Interest rate contracts	—				—				—				—
		$	66,457			$	(24,035	)		$	8,130			$	(23,208	)
	Cash settlements and gains (losses):
	Cash (paid) received for:
	Commodity contract settlements	$	(7,557	)		$	(4,165	)		$	(17,836	)		$	1,625
	Interest rate contract settlements	—				—				—				—
		(7,557		)		(4,165		)		(17,836		)		1,625
	Gains (losses) attributable to:
	Commodity contracts	74,014				(19,870		)		25,966				(24,833		)
	Interest rate contracts	—				—				—				—
		74,014				(19,870		)		25,966				(24,833		)
		$	66,457			$	(24,035	)		$	8,130			$	(23,208	)
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
				30-Sep-14								31-Dec-13
				Derivative				Derivative				Derivative				Derivative
	Type		Balance Sheet Location	Assets				Liabilities				Assets				Liabilities
	Commodity contracts		Derivative assets/liabilities – current	$	13,680			$	1,045			$	3,830			$	10,141
	Interest rate contracts		Derivative assets/liabilities – current	—				—				—				—
				13,680				1,045				3,830				10,141
	Commodity contracts		Derivative assets/liabilities – noncurrent	8,572				—				1,552				—
	Interest rate contracts		Derivative assets/liabilities – noncurrent	—				—				—				—
				8,572				—				1,552				—
				$	22,252			$	1,045			$	5,382			$	10,141

Property_and_Equipment_Tables

Property and Equipment (Tables)	9 Months Ended
	Sep. 30, 2014
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
		September 30,			December 31,
		2014			2013
	Oil and gas properties:
	Proved	$	450,601		$	460,255
	Unproved	137,464			101,520
	Total oil and gas properties	588,065			561,775
	Other property and equipment:
	Wells, equipment and facilities	2,743,466			2,593,700
	Support equipment	23,153			21,513
	Total other property and equipment	2,766,619			2,615,213
		3,354,684			3,176,988
	Accumulated depreciation, depletion and amortization	(1,011,781		)	(939,684		)
		$	2,342,903		$	2,237,304

LongTerm_Debt_Tables

Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Carrying Amount of Components of Long-term Debt	'
	The following table summarizes our long-term debt as of the dates presented:
		As of
		September 30,		December 31,
		2014		2013
	Revolving credit facility	$	—	$	206,000
	Senior notes due 2019	300,000		300,000
	Senior notes due 2020	775,000		775,000
		$	1,075,000	$	1,281,000

Additional_Balance_Sheet_Detai1

Additional Balance Sheet Detail (Tables)	9 Months Ended
	Sep. 30, 2014
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
		September 30,		December 31,
		2014		2013
	Other current assets:
	Tubular inventory and well materials	$	3,946	$	2,271
	Prepaid expenses	2,905		3,653
	Other	100		—
		$	6,951	$	5,924
	Other assets:
	Debt issuance costs	$	27,277	$	30,239
	Assets of supplemental employee retirement plan (“SERP”)	4,021		3,734
	Other	562		562
		$	31,860	$	34,535
	Accounts payable and accrued liabilities:
	Trade accounts payable	$	105,888	$	120,278
	Drilling and other lease operating costs	56,585		51,529
	Royalties	46,672		39,929
	Compensation – related	10,947		8,584
	Interest	37,417		15,718
	Preferred stock dividends	7,638		1,725
	Other	11,446		10,241
		$	276,593	$	248,004
	Other liabilities:
	Deferred gains on sale of assets	$	90,675	$	—
	Firm transportation obligation	12,352		13,245
	Asset retirement obligations (“AROs”)	5,808		6,437
	Defined benefit pension obligations	1,461		1,579
	Postretirement health care benefit obligations	1,154		1,023
	Deferred compensation – SERP obligations and other	4,130		3,883
	Other	10,066		7,219
		$	125,646	$	33,386

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2014
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
		30-Sep-14								31-Dec-13
		Fair				Carrying				Fair				Carrying
		Value				Value				Value				Value
	Senior Notes due 2019	$	300,750			$	300,000			$	307,500			$	300,000
	Senior Notes due 2020	821,500				775,000				837,969				775,000
		$	1,122,250			$	1,075,000			$	1,145,469			$	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 September 30, 2014
			Fair Value				Fair Value Measurement Classification
	Description		Measurement				Level 1				Level 2				Level 3
	Assets:
	Commodity derivative assets – current		$	13,680			$	—			$	13,680			$	—
	Commodity derivative assets – noncurrent		8,572				—				8,572				—
	Assets of SERP		4,021				4,021				—				—
	Liabilities:
	Commodity derivative liabilities – current		(1,045		)		—				(1,045		)		—
	Commodity derivative liabilities – noncurrent		—				—				—				—
	Deferred compensation – SERP obligations		(4,125		)		(4,125		)		—				—
			As of December 31, 2013
			Fair Value				Fair Value Measurement Classification
	Description		Measurement				Level 1				Level 2				Level 3
	Assets:
	Commodity derivative assets – current		$	3,830			$	—			$	3,830			$	—
	Commodity derivative assets – noncurrent		1,552				—				1,552				—
	Assets of SERP		3,734				3,734				—				—
	Liabilities:
	Commodity derivative liabilities – noncurrent		(10,141		)		—				(10,141		)		—
	Deferred compensation – SERP obligations		(3,879		)		(3,879		)		—				—

Shareholders_Equity_Tables

Shareholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2014
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 nine months ended September 30, 2014 and 2013:
		As of						Preferred								As of
		December 31,						Stock		Dividends			All Other			September 30,
		2013			Net Income			Offering		Declared 1			Changes 2			2014
	Preferred stock 3	$	1,150		$	—		$	3,250	$	—		$	(356	)	$	4,044
	Common stock 3	466			—			—		—			62			528
	Paid-in capital 3	891,351			—			310,080		—			3,871			1,205,302
	Accumulated deficit 3	(104,180		)	8,102			—		(11,081		)	(4,256		)	(111,415		)
	Deferred compensation obligation	2,792			—			—		—			314			3,106
	Accumulated other comprehensive income 4	267			—			—		—			74			341
	Treasury stock	(3,042		)	—			—		—			(197		)	(3,239		)
		$	788,804		$	8,102		$	313,330	$	(11,081	)	$	(488	)	$	1,098,667
		As of						Preferred								As of
		December 31,						Stock		Dividends			All Other			September 30,
		2012			Net Loss			Offering		Declared 1			Changes 2			2013
	Preferred stock	$	1,150		$	—		$	—	$	—		$	—		$	1,150
	Common stock 5	364			—			—		—			101			465
	Paid-in capital 5	849,046			—			—		—			46,404			895,450
	Retained earnings	45,790			(140,721		)	—		(5,175		)	—			(100,106		)
	Deferred compensation obligation	3,111			—			—		—			(384		)	2,727
	Accumulated other comprehensive loss 4	(982		)	—			—		—			56			(926		)
	Treasury stock	(3,363		)	—			—		—			386			(2,977		)
		$	895,116		$	(140,721	)	$	—	$	(5,175	)	$	46,563		$	795,783
	______________________
	1 Includes dividends of $450.00 per share on our 6% Series A Convertible Perpetual Preferred Stock (the “Series A Preferred Stock”) and $198.33 per share on our 6% Series B Convertible Perpetual Preferred Stock (the “Series B Preferred Stock”).
	2 Includes equity-classified share-based compensation of $2,638 and $4,781 for the nine months ended September 30, 2014 and 2013.
	3 A total of 3,555 shares, or 355,482 depositary shares, of the Series A Preferred Stock were converted into 5,924,706 shares of our common stock during the nine months ended September 30, 2014. We made payments of $4.3 million to induce the conversion of 3,527 of these shares.
	4 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 nine months ended September 30, 2014 and 2013 represent reclassifications from AOCI to net periodic benefit expense, a component of General and administrative expenses, of $114 and $86 and are presented above net of taxes of $40 and $30.
	5 Includes the Shares, with a fair value of $4.23 per share, that were issued to MHR in connection with the EF Acquisition.

ShareBased_Compensation_Tables

Share-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2014
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					Nine Months Ended
		September 30,					September 30,
		2014			2013		2014		2013
	Equity-classified awards:
	Stock option awards	$	403		$	612	$	1,193	$	2,518
	Common, deferred and restricted stock and stock unit awards	584			398		1,445		2,263
		987			1,010		2,638		4,781
	Liability-classified awards	(360		)	1,095		6,632		1,544
		$	627		$	2,105	$	9,270	$	6,325

Restructuring_and_Exit_Activit1

Restructuring and Exit Activities (Tables)	9 Months Ended
	Sep. 30, 2014
Restructuring and Related Activities [Abstract]	'
Summary of Restructuring Related Obligations	'
	The following table summarizes our restructuring and exit activity-related obligations and the changes therein for the periods presented:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
	Balance at beginning of period	$	15,559		$	16,677		$	16,090		$	17,263
	Employee, office and other costs accrued, net	18			2			27			5
	Accretion of firm transportation obligation	407			410			991			1,263
	Cash payments, net	(857		)	(705		)	(1,981		)	(2,147		)
	Balance at end of period	$	15,127		$	16,384		$	15,127		$	16,384

Interest_Expense_Tables

Interest Expense (Tables)	9 Months Ended
	Sep. 30, 2014
Banking and Thrift [Abstract]	'
Interest Expense Net Disclosure	'
	The following table summarizes the components of interest expense for the periods presented:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
	Interest on borrowings and related fees	$	22,559		$	22,754		$	69,477		$	57,239
	Accretion of original issue discount 1	—			—			—			431
	Amortization of debt issuance costs	1,063			961			3,114			2,415
	Capitalized interest	(1,669		)	(3,497		)	(4,875		)	(3,580		)
		$	21,953		$	20,218		$	67,716		$	56,505

Earnings_per_Share_Tables

Earnings per Share (Tables)	9 Months Ended
	Sep. 30, 2014
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						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
	Net income (loss)	$	89,661		$	(98,900	)	$	8,102		$	(140,721	)
	Less: Preferred stock dividends	(7,641		)	(1,725		)	(11,081		)	(5,175		)
	Less: Induced conversion of preferred stock	(888		)	—			(4,256		)	—
	Net income (loss) attributable to common shareholders – basic	$	81,132		$	(100,625	)	$	(7,235	)	$	(145,896	)
	Add: Preferred stock dividends 1	7,641			—			—			—
	Add: Induced conversion of preferred stock 1	888			—			—			—
	Net income (loss) attributable to common shareholders – diluted	$	89,661		$	(100,625	)	$	(7,235	)	$	(145,896	)
	Weighted-average shares – basic	71,536			65,465			67,909			61,272
	Effect of dilutive securities 2	32,070			—			—			—
	Weighted-average shares – diluted	103,606			65,465			67,909			61,272
	_______________________
	1 Preferred stock dividends and payments to induce the conversion of preferred stock were excluded from diluted earnings per share for the nine months ended September 30, 2014 and the three and nine months ended September 30, 2013 as the assumed conversion of the outstanding preferred stock would have been anti-dilutive.
	2 For the nine months ended September 30, 2014, approximately 24.9 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. For the three and nine months ended September 30, 2013, approximately 19.2 million and less than 0.1 million, respectively, potentially dilutive securities, including the Series A 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.

Acquisitions_and_Divestitures_

Acquisitions and Divestitures Purchase Price Allocation (Details) (USD $)	0 Months Ended	3 Months Ended	4 Months Ended	9 Months Ended
Share data in Millions, except Per Share data, unless otherwise specified	Apr. 24, 2013	Jun. 30, 2013	Apr. 24, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Acquisitions and Divestitures [Abstract]	'	'	'	'	'	'
Business Acquisition, Total Consideration Transferred, Net of Proceeds From Investing Partners	$380,000,000	'	'	'	'	'
Business Acquisition, Purchase Price Adjustments, Effective Date to Date of Acquisition	'	'	19,000,000	'	'	'
Stock Issued During Period, Shares, Acquisitions	10	'	'	'	'	'
Stock Issued during period, Fair Value per Share, Acquisitions	$4.23	'	$4.23	'	'	'
Proceeds From Joint Interest Partners Upon Exercise of Preferential Rights Related to the Acquisition	'	21,000,000	'	'	'	'
BusinessAcquisition, Oil and Gas Properties - Proved	267,688,000	'	267,688,000	2,743,466,000	'	2,593,700,000
BusinessAcquisitionsPurchasePriceAllocationUnprovedOilandGasProperties	119,709,000	'	119,709,000	'	'	'
Business Acquisition, Purchase Price Allocation, Current Assets, Receivables	107,345,000	'	107,345,000	'	'	'
Business Acquisition, Purchase Price Allocation, Current Assets, Prepaid Expense and Other Assets	2,068,000	'	2,068,000	'	'	'
Business Acquisition, Purchase Price Allocation, Assets Acquired	496,810,000	'	496,810,000	'	'	'
Business Acquisition, Purchase Price Allocation, Current Liabilities, Accounts Payable	94,771,000	'	94,771,000	'	'	'
Business Acquisition, Purchase Price Allocation, Current Liabilities, Accrued Liabilities	1,500,000	'	1,500,000	'	'	'
Business Acquisition, Purchase Price Allocation, Liabilities Assumed	96,271,000	'	96,271,000	'	'	'
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net	400,539,000	'	400,539,000	'	'	'
Cash Payments To Acquire Business, Net of Amounts Received for Preferential Rights	358,239,000	'	'	0	358,239,000	'
Stock Issued During Period, Value, Acquisitions	42,300,000	'	'	'	'	'
Business Combination, Consideration Transferred	$400,539,000	'	'	'	'	'

Acquisitions_and_Divestitures_1

Acquisitions and Divestitures Business Acquisition, Pro-Forma Information (Details) (USD $)	9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]	'
Business Acquisition, Pro Forma Revenue	$344,412
Business Acquisition, Pro Forma Net Income (Loss)	($124,172)
Business Acquisition, Pro Forma Earnings Per Share, Basic	($1.84)

Acquisitions_and_Divestitures_2

Acquisitions and Divestitures - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended		12 Months Ended	15 Months Ended	3 Months Ended		3 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Jul. 31, 2014	Sep. 30, 2014	Jul. 31, 2014	Sep. 30, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014
						Eagle Ford Shale, Lavaca County	Eagle Ford Shale, Lavaca County	South Texas Oil Gathering Sys. Development Rights	Selma Chalk	Selma Chalk	South Texas Natural Gas Gathering Assets
						acre
Business Acquisition [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Payments To Settle Obligations Assumed In Acquisition Net	'	($33,712,000)	$43,023,000	($22,500,000)	'	'	'	'	'	'	'
Purchased Oil and Gas Interests, Gross Area Of Property Acquired (in acres)	'	'	'	'	'	13,125	'	'	'	'	'
Proceeds from Sale of Intangible Assets	'	'	'	'	'	'	'	147,100,000	'	'	'
Impairment of Oil and Gas Properties	6,100,000	'	'	'	'	'	'	'	'	117,900,000	'
Business Combination, Disputed Contractual Adjustments, Settled in Arbitration	35,100,000	'	'	'	'	'	'	'	'	'	'
Proceeds from Sale of Oil and Gas Property and Equipment	'	'	'	'	'	'	'	'	67,900,000	'	96,000,000
Gain (Loss) on Sale of Oil and Gas Property	'	'	'	'	'	'	'	147,100,000	'	'	67,300,000
Sale Leaseback Transaction, Recognized Gain, Net	'	'	'	'	'	'	'	63,000,000	'	'	56,700,000
Sale Leaseback Transaction, Deferred Gain, Gross	'	'	'	'	'	'	'	84,100,000	'	'	10,600,000
Sale Leaseback Transaction, Current Period Gain Recognized	100,000	300,000	'	'	'	'	'	'	'	'	'
Sale Leaseback Transaction, Deferred Gain, Current	400,000	400,000	'	'	'	'	'	'	'	'	'
Sale Leaseback Transaction, Deferred Gain, Net	9,900,000	9,900,000	'	'	'	'	'	'	'	'	'
Purchased Oil and Gas Interests, Net Area Of Property Acquired (in acres)	'	'	'	'	'	11,660	'	'	'	'	'
Asset Acquisition, Purchase Price	'	'	'	'	'	'	45,600,000	'	'	'	'
Business Combination, Consideration Transferred	'	'	'	'	'	34,900,000	'	'	'	'	'
Business Combination, Consideration Transferred, Liabilities Incurred	'	'	'	'	'	10,700,000	'	'	'	'	'
Arbitration Settlement Interest	'	'	'	'	$1,300,000	'	'	'	'	'	'

Summary_of_Accounts_Receivable

Summary of Accounts Receivable (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Receivables [Abstract]	'	'
Customers	$97,139	$93,288
Joint interest partners	84,112	76,199
Other	7,608	25,538
Accounts Receivable, Gross, Current, Total	188,859	195,025
Less: Allowance for doubtful accounts	-176	-622
Accounts receivable, net of allowance for doubtful accounts	$188,683	$194,403

Accounts_Receivable_and_Major_2

Accounts Receivable and Major Customers - Additional Information (Detail) (USD $)	9 Months Ended										12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2013
	Sales Revenue	Sales Revenue	Sales Revenue	Sales Revenue	Sales Revenue	Sales Revenue	Sales Revenue	Sales Revenue	Sales Revenue	Accounts Receivable	Accounts Receivable
	Customer Concentration Risk	Customer Concentration Risk	Customer Concentration Risk	Customer Concentration Risk	Customer Concentration Risk	Customer Concentration Risk	Customer Concentration Risk	Customer Concentration Risk	Customer Concentration Risk	Credit Concentration Risk	Credit Concentration Risk
	Customer	Customer	Major Customer 1	Major Customer 1	Major Customer 2	Major Customer 2	Major Customer 3	Major Customer 3	Major Customer 4
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Number of major customers	4	3	'	'	'	'	'	'	'	'	'
Revenues, major customers	$267	$124.10	$86.20	$51.90	$72.50	$37.70	$55.80	$34.50	$52.60	'	'
Concentration risk, percentage	65.00%	40.00%	21.00%	17.00%	18.00%	12.00%	13.00%	11.00%	13.00%	67.00%	37.00%
Accounts receivable, major customers	'	'	'	'	'	'	'	'	'	$65.20	$34.80

Derivative_Instruments_Additio

Derivative Instruments - Additional Information (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014
In Thousands, unless otherwise specified			7.25% Senior Unsecured Notes due 2019	Commodity contracts	Commodity contracts	Commodity contracts	Commodity contracts
				Entity	Credit Concentration Risk	Natural Gas	Crude Oil
					Entity
Derivative Instruments and Hedging Activities Disclosure [Line Items]	'	'	'	'	'	'	'
Third-party quoted forward prices	'	'	'	'	'	'NYMEX Henry Hub gas	'West Texas Intermediate crude oil
Annual interest rate	'	'	7.25%	'	'	'	'
Derivative assets	$22,252	$5,382	'	$22,300	'	'	'
Number of derivative counterparties	'	'	'	7	2	'	'

Commodity_Derivative_Positions

Commodity Derivative Positions (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014
	bbl
Settlements to be received (paid) in subsequent period	'
Derivative Instruments Related to Oil and Gas Production [Line Items]	'
Fair Value Asset	$52
Fair Value Liability	0
Crude Oil | Group One	'
Derivative Instruments Related to Oil and Gas Production [Line Items]	'
Instrument	'Collars
Derivative, Nonmonetary Notional Amount	2,000
Weighted Average Price, Floor/Swap	90
Weighted Average Price, Ceiling	94,330
Fair Value Asset	264
Fair Value Liability	0
Crude Oil | Group Two	'
Derivative Instruments Related to Oil and Gas Production [Line Items]	'
Instrument	'Collars
Derivative, Nonmonetary Notional Amount	4,000
Weighted Average Price, Floor/Swap	87.5
Weighted Average Price, Ceiling	94,660
Fair Value Asset	649
Fair Value Liability	0
Crude Oil | Group Three	'
Derivative Instruments Related to Oil and Gas Production [Line Items]	'
Instrument	'Collars
Derivative, Nonmonetary Notional Amount	4,000
Weighted Average Price, Floor/Swap	87.5
Weighted Average Price, Ceiling	94,660
Fair Value Asset	947
Fair Value Liability	0
Crude Oil | Group Four	'
Derivative Instruments Related to Oil and Gas Production [Line Items]	'
Instrument	'Collars
Derivative, Nonmonetary Notional Amount	3,000
Weighted Average Price, Floor/Swap	86.67
Weighted Average Price, Ceiling	94,730
Fair Value Asset	770
Fair Value Liability	0
Crude Oil | Group Five	'
Derivative Instruments Related to Oil and Gas Production [Line Items]	'
Instrument	'Collars
Derivative, Nonmonetary Notional Amount	3,000
Weighted Average Price, Floor/Swap	86.67
Weighted Average Price, Ceiling	94,730
Fair Value Asset	838
Fair Value Liability	0
Crude Oil | Group Six	'
Derivative Instruments Related to Oil and Gas Production [Line Items]	'
Instrument	'Swaps
Derivative, Nonmonetary Notional Amount	11,000
Derivative, Swap Type, Average Fixed Price	93.45
Fair Value Asset	3,301
Fair Value Liability	40
Crude Oil | Group Seven	'
Derivative Instruments Related to Oil and Gas Production [Line Items]	'
Instrument	'Swaps
Derivative, Nonmonetary Notional Amount	9,000
Derivative, Swap Type, Average Fixed Price	91.81
Fair Value Asset	2,197
Fair Value Liability	0
Crude Oil | Group Eight	'
Derivative Instruments Related to Oil and Gas Production [Line Items]	'
Instrument	'Swaps
Derivative, Nonmonetary Notional Amount	9,000
Derivative, Swap Type, Average Fixed Price	91.81
Fair Value Asset	2,835
Fair Value Liability	0
Crude Oil | Group Nine	'
Derivative Instruments Related to Oil and Gas Production [Line Items]	'
Instrument	'Swaps
Derivative, Nonmonetary Notional Amount	8,000
Derivative, Swap Type, Average Fixed Price	91.06
Fair Value Asset	2,352
Fair Value Liability	0
Crude Oil | Group Ten	'
Derivative Instruments Related to Oil and Gas Production [Line Items]	'
Instrument	'Swaps
Derivative, Nonmonetary Notional Amount	8,000
Derivative, Swap Type, Average Fixed Price	91.06
Fair Value Asset	2,432
Fair Value Liability	0
Crude Oil | Group Eleven	'
Derivative Instruments Related to Oil and Gas Production [Line Items]	'
Instrument	'Swaps
Derivative, Nonmonetary Notional Amount	3,000
Derivative, Swap Type, Average Fixed Price	90.84
Fair Value Asset	1,176
Fair Value Liability	0
Crude Oil | Group Twelve	'
Derivative Instruments Related to Oil and Gas Production [Line Items]	'
Instrument	'Swaps
Derivative, Nonmonetary Notional Amount	3,000
Derivative, Swap Type, Average Fixed Price	90.84
Fair Value Asset	1,284
Fair Value Liability	0
Crude Oil | Group Thirteen	'
Derivative Instruments Related to Oil and Gas Production [Line Items]	'
Instrument	'Swaps
Derivative, Nonmonetary Notional Amount	3,000
Derivative, Swap Type, Average Fixed Price	90.84
Fair Value Asset	1,395
Fair Value Liability	0
Crude Oil | Group Fourteen	'
Derivative Instruments Related to Oil and Gas Production [Line Items]	'
Instrument	'Swaps
Derivative, Nonmonetary Notional Amount	3,000
Derivative, Swap Type, Average Fixed Price	90.84
Fair Value Asset	1,447
Fair Value Liability	0
Crude Oil | Group Fifteen	'
Derivative Instruments Related to Oil and Gas Production [Line Items]	'
Instrument	'Swaptions
Derivative, Nonmonetary Notional Amount	1,000
Derivative, Average Price Risk Option Strike Price	88
Fair Value Asset	0
Fair Value Liability	252
Crude Oil | Group Sixteen	'
Derivative Instruments Related to Oil and Gas Production [Line Items]	'
Instrument	'Swaptions
Derivative, Nonmonetary Notional Amount	1,000
Derivative, Average Price Risk Option Strike Price	88
Fair Value Asset	0
Fair Value Liability	251
Crude Oil | Group Seventeen	'
Derivative Instruments Related to Oil and Gas Production [Line Items]	'
Instrument	'Swaptions
Derivative, Nonmonetary Notional Amount	1,000
Derivative, Average Price Risk Option Strike Price	88
Fair Value Asset	0
Fair Value Liability	251
Crude Oil | Group Eighteen	'
Derivative Instruments Related to Oil and Gas Production [Line Items]	'
Instrument	'Swaptions
Derivative, Nonmonetary Notional Amount	1,000
Derivative, Average Price Risk Option Strike Price	88
Fair Value Asset	0
Fair Value Liability	251
Natural Gas | Group Nineteen	'
Derivative Instruments Related to Oil and Gas Production [Line Items]	'
Instrument	'Swaps
Average Volume Per Day (MMBtu)	5,000
Weighted Average Price, Floor/Swap	4.5
Fair Value Asset	185
Fair Value Liability	0
Natural Gas | Group Twenty	'
Derivative Instruments Related to Oil and Gas Production [Line Items]	'
Instrument	'Swaps
Average Volume Per Day (MMBtu)	5,000
Weighted Average Price, Floor/Swap	4.5
Fair Value Asset	129
Fair Value Liability	$0

Impact_of_Derivative_Activitie

Impact of Derivative Activities on Condensed Consolidated Statements of Income (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivatives	$66,457	($24,035)	$8,130	($23,208)
Cash received (paid)	-7,557	-4,165	-17,836	1,625
Unrealized gains (losses)	74,014	-19,870	25,966	-24,833
Commodity contracts	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivatives	66,457	-24,035	8,130	-23,208
Derivative, Cash Received on Hedge	7,557	4,165	17,836	-1,625
Unrealized gains (losses)	74,014	-19,870	25,966	-24,833
Interest rate contracts	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Derivatives	0	0	0	0
Cash received (paid)	0	0	0	0
Unrealized gains (losses)	$0	$0	$0	$0

Fair_Value_of_Derivative_Instr

Fair Value of Derivative Instruments on Condensed Consolidated Balance Sheets (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Derivatives, Fair Value [Line Items]	'	'
Derivative assets, current	$13,680	$3,830
Derivative assets, noncurrent	8,572	1,552
Derivative assets	22,252	5,382
Derivative liabilities, current	1,045	10,141
Derivative liabilities, noncurrent	0	0
Derivative liabilities	1,045	10,141
Commodity contracts	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets	22,300	'
Commodity contracts | Derivative assets/liabilities - current	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets, current	13,680	3,830
Derivative liabilities, current	1,045	10,141
Commodity contracts | Derivative assets/liabilities - noncurrent	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets, noncurrent	8,572	1,552
Derivative liabilities, noncurrent	0	0
Interest rate contracts | Derivative assets/liabilities - current	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets, current	0	0
Derivative liabilities, current	0	0
Interest rate contracts | Derivative assets/liabilities - noncurrent	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets, noncurrent	0	0
Derivative liabilities, noncurrent	$0	$0

Summary_of_Property_and_Equipm

Summary of Property and Equipment (Detail) (USD $)	3 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Apr. 24, 2013
Property, Plant and Equipment [Line Items]	'	'	'	'
Impairment of Oil and Gas Properties	$6,100,000	'	'	'
Impairment of Long-Lived Assets to be Disposed of	'	117,900,000	'	'
Oil and gas properties:	'	'	'	'
Proved	450,601,000	'	460,255,000	'
Unproved	137,464,000	'	101,520,000	'
Total oil and gas properties	588,065,000	'	561,775,000	'
Capitalized Costs, Proved Properties	2,743,466,000	'	2,593,700,000	267,688,000
Capitalized Costs, Support Equipment and Facilities	23,153,000	'	21,513,000	'
Property, Plant and Equipment, Other, Gross	2,766,619,000	'	2,615,213,000	'
Properties and equipment, gross, total	3,354,684,000	'	3,176,988,000	'
Accumulated depreciation, depletion and amortization	-1,011,781,000	'	-939,684,000	'
Property and equipment, net (successful efforts method)	$2,342,903,000	'	$2,237,304,000	'

Summary_of_LongTerm_Debt_Detai

Summary of Long-Term Debt (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Instrument [Line Items]	'	'
Revolving credit facility	$0	$206,000
Total	1,075,000	1,281,000
7.25% Senior Notes due 2019	'	'
Debt Instrument [Line Items]	'	'
Senior notes	300,000	300,000
8.5% Senior Notes due 2020	'	'
Debt Instrument [Line Items]	'	'
Senior notes	$775,000	$775,000

LongTerm_Debt_Additional_Infor

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

3 Months Ended

9 Months Ended

9 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Oct. 28, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Jul. 31, 2014

Oct. 28, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Revolving credit facility

Revolving credit facility

Revolving credit facility

Revolving credit facility

Revolving credit facility

Revolving credit facility

Revolving credit facility

Previous Revolving Credit Facility

Previous Revolving Credit Facility

Previous Revolving Credit Facility

7.25% Senior Notes due 2019

7.25% Senior Notes due 2019

7.25% Senior Notes due 2019

7.25% Senior Notes due 2019

Senior Notes due 2020

Senior Notes due 2020

Minimum

Maximum

through December 31, 2013

through maturity

Letter of Credit

Group One

Group Two

Maximum

Maximum

Debt Disclosure [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Gains (Losses) on Extinguishment of Debt

$0

$0

$0

($29,157,000)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Senior Notes, Noncurrent

'

'

'

'

'

'

'

'

'

'

'

'

'

'

300,000,000

300,000,000

'

'

775,000,000

775,000,000

Line Of Credit Facility Borrowing Base

'

'

'

'

'

'

'

'

'

'

'

'

437,500,000

475,000,000

'

'

'

'

'

'

Maximum borrowing capacity

'

'

'

'

'

450,000,000

'

'

'

'

20,000,000

'

'

'

'

'

'

'

'

'

Optional additional borrowing

'

'

'

'

150,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Letter of credit amount outstanding

'

'

'

'

'

'

'

'

'

'

'

1,700,000

'

'

'

'

'

'

'

'

Available borrowing capacity

'

'

'

'

'

'

'

'

'

'

'

$435,800,000

'

'

'

'

'

'

'

'

Credit facility interest rate option one, applicable margin rate over Adjusted LIBOR

'

'

'

'

'

'

1.50%

2.50%

'

'

'

'

'

'

'

'

'

'

'

'

Credit facility interest rate option two, base rate over federal funds effective rate

'

'

'

'

0.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Description of Variable Rate Basis

'

'

'one-month Adjusted LIBOR

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit facility interest rate option two, base rate over one-month Adjusted LIBOR

'

'

'

'

1.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit facility interest rate option two, applicable margin rate

'

'

'

'

1.50%

'

0.50%

1.50%

'

'

'

'

'

'

'

'

'

'

'

'

Commitment fees for undrawn credit facility

'

'

'

'

'

'

0.38%

0.50%

'

'

'

'

'

'

'

'

'

'

'

'

LIne of Credit Facility, Commitment Fee Percentage at Period End

'

'

'

'

0.38%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Interest Rate at Period End

'

'

'

'

1.69%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Interest Rate at Period End, LIBOR component

'

'

'

'

0.19%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Current ratio

'

'

'

'

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt to EBITDAX ratio

'

'

'

'

'

'

'

'

4.25

4

'

'

'

'

'

'

'

'

'

'

Annual interest rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7.25%

'

'

'

8.50%

'

Redemption option, percent of principal

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

103.63%

100.00%

'

'

Income_Taxes_Details

Income Taxes (Details)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]	'	'
Effective Income Tax Rate Reconciliation, Percent	4.40%	34.90%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	'

Components_of_Selected_Balance

Components of Selected Balance Sheet Accounts (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Other current assets:	'	'
Tubular inventory and well materials	$3,946	$2,271
Prepaid expenses	2,905	3,653
Other Assets, Miscellaneous, Current	100	0
Other Assets, Current	6,951	5,924
Other assets:	'	'
Debt issuance costs	27,277	30,239
Assets of supplemental employee retirement plan (“SERP”)	4,021	3,734
Other	562	562
Other assets	31,860	34,535
Accounts payable and accrued liabilities:	'	'
Trade accounts payable	105,888	120,278
Drilling and other lease operating costs	56,585	51,529
Royalties	46,672	39,929
Compensation – related	10,947	8,584
Interest	37,417	15,718
Preferred stock dividends	7,638	1,725
Other	11,446	10,241
Accounts payable and accrued liabilities	276,593	248,004
Other liabilities:	'	'
Sale Leaseback Transaction Deferred Gain Noncurrent	90,675	0
Firm transportation obligation	12,352	13,245
Asset retirement obligations (“AROs”)	5,808	6,437
Defined benefit pension obligations	1,461	1,579
Postretirement health care benefit obligations	1,154	1,023
Deferred compensation – SERP obligations and other	4,130	3,883
Other	10,066	7,219
Other liabilities	$125,646	$33,386

Fair_Value_Summary_of_LongTerm

Fair Value Summary of Long-Term Debt with Fixed Interest Rates (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Long-term debt with fixed interest rates	$1,122,250	$1,145,469
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	300,750	307,500
Fair Value | 8.5% Senior Notes due 2020	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Long-term debt with fixed interest rates	821,500	837,969
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 | 8.5% 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 $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets:	'	'
Commodity derivative assets – current	$13,680	$3,830
Commodity derivative assets – noncurrent	8,572	1,552
Liabilities:	'	'
Commodity derivative liabilities – current	-1,045	-10,141
Commodity derivative liabilities – noncurrent	0	0
Fair Value, Measurements, Recurring | Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Assets:	'	'
Assets of SERP	4,021	3,734
Liabilities:	'	'
Deferred compensation – SERP obligations	-4,125	-3,879
Fair Value, Measurements, Recurring | Level 1	'	'
Assets:	'	'
Assets of SERP	4,021	3,734
Liabilities:	'	'
Deferred compensation – SERP obligations	-4,125	-3,879
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	13,680	3,830
Commodity derivative assets – noncurrent	8,572	1,552
Liabilities:	'	'
Commodity derivative liabilities – current	-1,045	-10,141
Commodity derivative liabilities – noncurrent	0	'
Fair Value, Measurements, Recurring | Commodity contracts | Level 1	'	'
Assets:	'	'
Commodity derivative assets – current	0	0
Commodity derivative assets – noncurrent	0	0
Liabilities:	'	'
Commodity derivative liabilities – current	0	0
Commodity derivative liabilities – noncurrent	0	'
Fair Value, Measurements, Recurring | Commodity contracts | Level 2	'	'
Assets:	'	'
Commodity derivative assets – current	13,680	3,830
Commodity derivative assets – noncurrent	8,572	1,552
Liabilities:	'	'
Commodity derivative liabilities – current	-1,045	-10,141
Commodity derivative liabilities – noncurrent	0	'
Fair Value, Measurements, Recurring | Commodity contracts | Level 3	'	'
Assets:	'	'
Commodity derivative assets – current	0	0
Commodity derivative assets – noncurrent	0	0
Liabilities:	'	'
Commodity derivative liabilities – current	0	0
Commodity derivative liabilities – noncurrent	$0	'

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2010	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014
In Millions, unless otherwise specified		Legal Reserve	Contract Drilling	Maximum	Maximum	Minimum	Gas Gathering And Compression Services	Crude Oil Gathering And Transportation Services
				Contract Drilling	Firm Transportation	Firm Transportation
Commitments and Contingencies Disclosure [Line Items]	'	'	'	'	'	'	'	'
Contract term	'	'	'	'11 months	'15 years	'1 year	'	'
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	'	'	$24.40	'	'	'	'	'
Contractual Obligation, Due in Next Twelve Months	'	'	'	'	'	'	3.7	'
Contractual Obligation, Due in Second Year	'	'	'	'	'	'	4.2	'
Contractual Obligation, Due in Third Year	'	'	'	'	'	'	5	'
Contractual Obligation	'	'	'	'	'	'	'	13.7
Reserve established for contingency matters	'	0.9	'	'	'	'	'	'
Asset retirement obligations	$5.80	'	'	'	'	'	'	'

Shareholders_Equity_Rollforwar

Shareholders' Equity Rollforward (Details) (USD $)

3 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

In Thousands, except Share data, unless otherwise specified

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Apr. 24, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Preferred stock

Preferred stock

Preferred stock

Common stock

Common stock

Paid-in capital

Paid-in capital

Accumulated deficit

Accumulated deficit

Deferred compensation obligation

Deferred compensation obligation

Accumulated other comprehensive income

Accumulated other comprehensive income

Treasury stock

Treasury stock

Depositary Shares

Convertible Preferred Stock

Schedule of Stockholders' Equity [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock Issued during period, Fair Value per Share, Acquisitions

'

'

'

'

$4.23

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred Stock, Value, Issued

'

'

($313,330)

[1]

'

'

$3,250

'

'

'

'

$310,080

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation

'

'

2,638

4,781

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Conversion of Stock, Shares Converted

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

355,482

3,555

Stock Issued During Period, Shares, Conversion of Convertible Securities

'

'

5,924,706

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Increase (Decrease) in Stockholders' Equity [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

As of beginning balance

'

'

788,804

895,116

'

1,150

[2]

1,150

1,150

466

[2]

364

891,351

[2]

849,046

-104,180

45,790

2,792

3,111

267

[3]

-982

[3]

-3,042

-3,363

'

'

Net income (loss)

89,661

-98,900

8,102

-140,721

'

'

'

'

'

'

'

'

8,102

'

'

'

'

'

'

'

'

'

Dividends Declared

'

'

-11,081

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Dividends Declared

'

'

'

-5,175

[2]

'

'

'

'

'

'

'

'

'

-5,175

[2]

'

'

'

'

'

'

'

'

All Other Changes

'

'

-488

[4]

46,563

[4]

'

-356

[2],[4]

'

'

62

[2],[4]

101

[4],[5]

3,871

[2],[4]

46,404

[4],[5]

'

'

314

[4]

-384

[4]

74

[3],[4]

56

[3],[4]

-197

[4]

386

[4]

'

'

As of ending balance

1,098,667

795,783

1,098,667

795,783

'

4,044

[2]

1,150

1,150

528

[2]

465

1,205,302

[2]

895,450

-111,415

-100,106

3,106

2,727

341

[3]

-926

[3]

-3,239

-2,977

'

'

Preferred stock dividends

-7,641

[6]

-1,725

[6]

-11,081

[6]

-5,175

[6]

'

'

'

'

'

'

'

'

-11,081

[1]

'

'

'

'

'

'

'

'

'

Preferred Stock Conversions, Inducements

($888)

$0

($4,256)

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

Includes dividends of $450.00 per share on our 6% Series A Convertible Perpetual Preferred Stock (the “Series A Preferred Stock”) and $198.33 per share on our 6% Series B Convertible Perpetual Preferred Stock (the “Series B Preferred Stock”).

[2]

A total of 3,555 shares, or 355,482 depositary shares, of the Series A Preferred Stock were converted into 5,924,706 shares of our common stock during the nine months ended September 30, 2014. We made payments of $4.3 million to induce the conversion of 3,527 of these shares.

[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 nine months ended September 30, 2014 and 2013 represent reclassifications from AOCI to net periodic benefit expense, a component of General and administrative expenses, of $114 and $86 and are presented above net of taxes of $40 and $30.

[4]

Includes equity-classified share-based compensation of $2,638 and $4,781 for the nine months ended September 30, 2014 and 2013.

[5]

Includes the Shares, with a fair value of $4.23 per share, that were issued to MHR in connection with the EF Acquisition.

[6]

Preferred stock dividends and payments to induce the conversion of preferred stock were excluded from diluted earnings per share for the nine months ended September 30, 2014 and the three and nine months ended September 30, 2013 as the assumed conversion of the outstanding preferred stock would have been anti-dilutive.

Shareholders_Equity_Additional

Shareholders' Equity - Additional Information (Detail) (USD $)

3 Months Ended

9 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

In Thousands, except Share data, unless otherwise specified

Sep. 30, 2014

Jun. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Jun. 10, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Depositary Shares

Series A Preferred Stock

Series A Preferred Stock

Series B Preferred Stock

Series B Preferred Stock

Convertible Preferred Stock

Class of Stock [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Preferred Stock, Shares Issued

'

'

'

'

'

'

'

7,945

11,500

32,500

32,500

'

Stockholders' Equity, Other

'

'

'

$488

[1]

($46,563)

[1]

'

'

'

'

'

'

'

Preferred Stock Conversions, Inducements

888

'

0

4,256

0

'

'

4,300

'

'

'

'

Conversion of Stock, Shares Converted for Inducement Consideration

'

'

'

'

'

'

'

3,527

'

'

'

'

Preferred stock dividends (in dollars per share)

'

'

'

'

'

'

'

$450

'

'

$198

'

Preferred stock dividend rate

'

'

'

'

'

'

'

6.00%

'

'

6.00%

'

Proceeds from Issuance of Convertible Preferred Stock

313,000

'

'

313,330

0

'

'

'

'

'

'

'

Conversion of Stock, Shares Converted

'

'

'

'

'

'

355,482

'

'

'

'

3,555

Other Comprehensive loss, pension and postretirements obligations, before tax

'

'

'

114

86

'

'

'

'

'

'

'

Change in pension and postretirement obligations, net of tax

$14

'

$10

$40

$30

'

'

'

'

'

'

'

Depositary Shares Issued During Period, New Issues

'

3,250,000

'

'

'

'

'

'

'

'

'

'

Depositary Share Interest in a Share of 6.00% Convertible Perpetual Preferred Stock, Series B

0.01

'

'

'

'

'

'

'

'

'

'

'

Stock Issued During Period, Shares, New Issues

'

'

'

'

'

'

'

'

'

32,500

'

'

Preferred Stock, Liquidation Preference Per Share

$10,000

'

'

$10,000

'

'

'

'

'

'

'

'

Conversion Price per Share

$18.34

'

'

$18.34

'

'

'

'

'

'

'

'

Convertible Preferred Stock, Shares Issued upon Conversion

545.17

'

'

'

'

'

'

'

'

'

'

'

Premium, Conversion Price to Common Share Closing Price Prior to Series B Preferred Stock Offering

'

'

'

'

'

30.00%

'

'

'

'

'

'

Common Share Price, Last Reported Prior to Series B Preferred Stock Offering

'

'

'

'

'

$14.11

'

'

'

'

'

'

Premium, Conversion Ratio into Common Stock if Closing Sale Price Exceed Prior Period Conversion Price

130.00%

'

'

130.00%

'

'

'

'

'

'

'

'

[1]

Includes equity-classified share-based compensation of $2,638 and $4,781 for the nine months ended September 30, 2014 and 2013.

Summary_of_ShareBased_Compensa

Summary of Share-Based Compensation Expense (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Stock option awards	$403	$612	$1,193	$2,518
Common, deferred, restricted and restricted unit awards	584	398	1,445	2,263
Share-based compensation	'	'	2,638	4,781
Allocated Share-based Compensation Expense	627	2,105	9,270	6,325
Equity-classified awards:	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Share-based compensation	987	1,010	2,638	4,781
Liability-classified awards	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Share-based compensation	($360)	$1,095	$6,632	$1,544

Restructuring_and_Exit_Activit2

Restructuring and Exit Activities - Additional Information (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]	'	'
Restructuring reserve, noncurrent	$12,352,000	$13,245,000
Accounts Payable and Accrued Liabilities	'	'
Restructuring Cost and Reserve [Line Items]	'	'
Restructuring reserve, current	2,700,000	'
Other Noncurrent Liabilities	'	'
Restructuring Cost and Reserve [Line Items]	'	'
Restructuring reserve, noncurrent	$12,400,000	'

Summary_of_Restructuring_Relat

Summary of Restructuring Related Obligations (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Restructuring Reserve [Roll Forward]	'	'	'	'
Balance at beginning of period	$15,559	$16,677	$16,090	$17,263
Employee, office and other costs accrued, net	18	2	27	5
Accretion of firm transportation obligation	-407	410	991	1,263
Cash payments, net	-857	-705	-1,981	-2,147
Balance at end of period	$15,127	$16,384	$15,127	$16,384

Components_of_Interest_Expense

Components of Interest Expense (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Banking and Thrift [Abstract]	'	'	'	'
Interest on borrowings and related fees	$22,559	$22,754	$69,477	$57,239
Accretion of original issue discount 1	0	0	0	431
Amortization of debt issuance costs	1,063	961	3,114	2,415
Capitalized interest	-1,669	-3,497	-4,875	-3,580
Interest expense	$21,953	$20,218	$67,716	$56,505

Components_of_Calculation_of_B

Components of Calculation of Basic and Diluted Earnings Per Share (Detail) (USD $)	3 Months Ended				9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Earnings Per Share [Abstract]	'		'		'		'
Net income (loss)	$89,661		($98,900)		$8,102		($140,721)
Less: Preferred stock dividends	-7,641	[1]	-1,725	[1]	-11,081	[1]	-5,175	[1]
Preferred Stock Conversions, Inducements	-888		0		-4,256		0
Net income (loss) attributable to common shareholders, Basic	81,132		-100,625		-7,235		-145,896
Other Preferred Stock Dividends and Adjustments	888		'		'		'
Net income (loss) attributable to common shareholders, Diluted	$89,661		($100,625)		($7,235)		($145,896)
Weighted-average shares – Basic	71,536,000		65,465,000		67,909,000		61,272,000
Effect of dilutive securities	32,070,000	[2]	0	[2]	0	[2]	0	[2]
Weighted-average shares – Diluted	103,606,000		65,465,000		67,909,000		61,272,000
Potentially dilutive securities with the effect of being anti-dilutive excluded from the calculation of diluted earnings per common share	'		19,200,000		24,900,000		100,000
[1]	Preferred stock dividends and payments to induce the conversion of preferred stock were excluded from diluted earnings per share for the nine months ended September 30, 2014 and the three and nine months ended September 30, 2013 as the assumed conversion of the outstanding preferred stock would have been anti-dilutive.
[2]	For the nine months ended September 30, 2014, approximately 24.9 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. For the three and nine months ended September 30, 2013, approximately 19.2 million and less than 0.1 million, respectively, potentially dilutive securities, including the Series A 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.