CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income (loss)	$ (327,388)us-gaap_NetIncomeLoss	$ 25,943us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	86,422	82,646
Write-down of oil and gas properties	491,412us-gaap_ImpairmentOfOilAndGasProperties
Accretion expense	6,409	7,555
Deferred income tax (benefit) provision	(179,906)us-gaap_DeferredIncomeTaxExpenseBenefit	15,102us-gaap_DeferredIncomeTaxExpenseBenefit
Settlement of asset retirement obligations	(17,145)	(9,842)
Non-cash stock compensation expense	2,640us-gaap_ShareBasedCompensation	2,247us-gaap_ShareBasedCompensation
Non-cash derivative expense	1,511us-gaap_UnrealizedGainLossOnDerivatives	448us-gaap_UnrealizedGainLossOnDerivatives
Non-cash interest expense	4,318us-gaap_OtherNoncashExpense	4,070us-gaap_OtherNoncashExpense
Change in current income taxes	7,188
(Increase) decrease in accounts receivable	8,206	(18,602)
Decrease in other current assets	1,883	100
Increase in inventory		(928)us-gaap_IncreaseDecreaseInInventories
Increase (decrease) in accounts payable	(8,657)	1,293
Increase in other current liabilities	6,889	5,820
Other	(260)	(380)
Net cash (used in) provided by operating activities	83,522	115,472
Cash flows from investing activities:
Investment in oil and gas properties	(169,895)	(287,175)
Proceeds from sale of oil and gas properties, net of expenses		51,954
Investment in fixed and other assets	(662)	(1,654)
Change in restricted funds	177,642	(358)
Net cash provided by (used in) investing activities	7,085	(237,233)
Cash flows from financing activities:
Proceeds from bank borrowings	5,000
Repayment of bank borrowings	(5,000)
Deferred financing costs		(126)us-gaap_PaymentsOfDebtIssuanceCosts
Net payments for share-based compensation	(2,991)	(6,565)
Net cash used in financing activities	(2,991)	(6,691)
Effect of exchange rate changes on cash	24	(11)
Net change in cash and cash equivalents	87,640	(128,463)
Cash and cash equivalents, beginning of period	74,488	331,224
Cash and cash equivalents, end of period	$ 162,128	$ 202,761

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