CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (409,592)us-gaap_ProfitLoss	$ (143,070)us-gaap_ProfitLoss	$ (104,589)us-gaap_ProfitLoss
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Loss on extinguishment of debt	0	29,174	3,144
Loss on firm transportation commitment	0pva_LossOnLongTermPurchaseCommitment	0pva_LossOnLongTermPurchaseCommitment	17,332pva_LossOnLongTermPurchaseCommitment
Depreciation, depletion and amortization	300,299	245,594	206,336
Impairments	791,809us-gaap_AssetImpairmentCharges	132,224us-gaap_AssetImpairmentCharges	104,484us-gaap_AssetImpairmentCharges
Accretion of firm transportation obligation	1,301	1,674	570
Derivative contracts:
Net (gains) losses	(162,212)pva_RealizedGainLossOnDerivatives	20,852pva_RealizedGainLossOnDerivatives	(36,187)pva_RealizedGainLossOnDerivatives
Cash settlements, net	(7,424)	(1,042)	29,723
Deferred income tax benefit	(135,227)	(77,696)	(68,676)
(Gain) loss on sales of assets, net	(120,769)	266	(4,282)
Non-cash exploration expense	10,346	17,451	32,634
Non-cash interest expense	4,197us-gaap_OtherNoncashExpense	3,844us-gaap_OtherNoncashExpense	4,062us-gaap_OtherNoncashExpense
Share-based compensation (equity-classified)	3,627us-gaap_ShareBasedCompensation	5,781us-gaap_ShareBasedCompensation	6,347us-gaap_ShareBasedCompensation
Other, net	94us-gaap_OtherNoncashIncomeExpense	297us-gaap_OtherNoncashIncomeExpense	434us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities:
Accounts receivable, net	(20,169)	(105,023)	9,907
Income taxes receivable and payable, net	(97)	0	31,439
Accounts payable and accrued expenses	27,362	129,670	9,710
Other assets and liabilities	(821)	1,516	(930)
Net cash provided by operating activities	282,724	261,512	241,458
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisition, net	0	(358,239)	0
Receipts (payments) to settle working capital adjustments assumed in acquisition, net	33,712	(22,455)	0
Capital expenditures – property and equipment	(774,139)	(504,203)	(370,907)
Proceeds from sales of assets and other, net	313,933	(54)	96,899
Net cash used in investing activities	(426,494)	(884,951)	(274,008)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of preferred stock, net	313,330	0	110,337
Payments to induce conversion of preferred stock	(4,256)	0	0
Proceeds from the issuance of common stock, net	0us-gaap_ProceedsFromRepurchaseOfEquity	0us-gaap_ProceedsFromRepurchaseOfEquity	43,474us-gaap_ProceedsFromRepurchaseOfEquity
Proceeds from the issuance of senior notes	0pva_ProceedsFromIssuanceOfSeniorNotes	775,000pva_ProceedsFromIssuanceOfSeniorNotes	0pva_ProceedsFromIssuanceOfSeniorNotes
Retirement of senior notes	0	(319,090)	(4,915)
Proceeds from revolving credit facility borrowings	412,000us-gaap_ProceedsFromLinesOfCredit	297,000us-gaap_ProceedsFromLinesOfCredit	211,000us-gaap_ProceedsFromLinesOfCredit
Repayment of revolving credit facility borrowings	(583,000)	(91,000)	(310,000)
Debt issuance costs paid	(151)us-gaap_PaymentsOfDebtIssuanceCosts	(25,634)us-gaap_PaymentsOfDebtIssuanceCosts	(2,032)us-gaap_PaymentsOfDebtIssuanceCosts
Dividends paid on preferred stock	(12,803)	(6,862)	0
Dividends paid on common stock	0us-gaap_PaymentsOfDividendsCommonStock	0us-gaap_PaymentsOfDividendsCommonStock	(5,176)us-gaap_PaymentsOfDividendsCommonStock
Other, net	1,428	(151)	0
Net cash provided by financing activities	126,548	629,263	42,688
Net (decrease) increase in cash and cash equivalents	(17,222)	5,824	10,138
Cash and cash equivalents - beginning of period	23,474	17,650	7,512
Cash and cash equivalents - end of period	6,252	23,474	17,650
Cash paid for:
Cash paid for interest (net of amounts capitalized)	84,797us-gaap_InterestPaidNet	65,107us-gaap_InterestPaidNet	54,808us-gaap_InterestPaidNet
Cash paid for income taxes (net of refunds received)	3,612us-gaap_IncomeTaxesPaidNet	0us-gaap_IncomeTaxesPaidNet	(32,603)us-gaap_IncomeTaxesPaidNet
Other assets acquired related to acquisition	0	99,213	0
Other liabilities assumed related to acquisition	0	96,271	0
Common stock transferred as consideration for acquisition	$ 0	$ 42,300	$ 0

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- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

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- Definition

The cash outflow to purchase long lived physical asset for use in the normal oil and gas operations and to purchase mineral interests in oil and gas properties not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation.

+ References

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- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-SubTopic 10

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-Subparagraph (SX 210.4-08.(f))

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-Publisher SEC

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-Article 4

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-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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- Definition

The net cash inflow or outflow resulting from the entity's share transaction.

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-Topic 230

-SubTopic 10

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-Paragraph 15

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4K

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- Definition

The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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-Publisher FASB

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-SubTopic 10

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-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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