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

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