Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
OPERATING ACTIVITIES:
Net income (loss)	$ (248,354)us-gaap_NetIncomeLoss	$ 56,945us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion, and amortization	103,590	88,432
Impairment of oil and natural gas properties (Note 2)	400,593us-gaap_ImpairmentOfOilAndGasProperties	0us-gaap_ImpairmentOfOilAndGasProperties
(Gain) loss on derivatives	(6,586)us-gaap_UnrealizedGainLossOnDerivatives	18,366us-gaap_UnrealizedGainLossOnDerivatives
Cash (payments) receipts on derivatives settled	11,012us-gaap_DerivativeCashReceivedOnHedge	(8,872)us-gaap_DerivativeCashReceivedOnHedge
Deferred tax expense (benefit)	(150,643)us-gaap_DeferredIncomeTaxExpenseBenefit	26,156us-gaap_DeferredIncomeTaxExpenseBenefit
Gain on disposition of assets	(545)us-gaap_GainsLossesOnSalesOfAssets	(9,426)us-gaap_GainsLossesOnSalesOfAssets
Employee stock compensation plans	5,863us-gaap_ShareBasedCompensation	5,444us-gaap_ShareBasedCompensation
Other, net	1,374us-gaap_OtherNoncashIncomeExpense	1,179us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities increasing (decreasing) cash:
Accounts receivable	51,910	(55,175)
Accounts payable	(3,131)	(11,430)
Material and supplies	(2,387)us-gaap_IncreaseDecreaseInInventories	2,781us-gaap_IncreaseDecreaseInInventories
Accrued liabilities	(6,295)	8,666
Other, net	3,908	394
Net cash provided by operating activities	160,309	123,460
INVESTING ACTIVITIES:
Capital expenditures	(233,412)	(197,266)
Proceeds from disposition of assets	2,385	36,748
Net cash used in investing activities	(231,027)	(160,518)
FINANCING ACTIVITIES:
Borrowings under credit agreement	224,399us-gaap_ProceedsFromLinesOfCredit	4,000us-gaap_ProceedsFromLinesOfCredit
Payments under credit agreement	(153,100)us-gaap_RepaymentsOfLinesOfCredit	(4,000)us-gaap_RepaymentsOfLinesOfCredit
Payments on capitalized leases	(874)	0
Proceeds from exercise of stock options	0	850
Book overdrafts	108	18,667
Net cash provided by financing activities	70,533	19,517
Net decrease in cash and cash equivalents	(185)	(17,541)
Cash and cash equivalents, beginning of period	1,049	18,593
Cash and cash equivalents, end of period	864	1,052
Cash paid during the year for:
Interest paid (net of capitalized)	(4,475)us-gaap_InterestPaidNet	(7,684)us-gaap_InterestPaidNet
Income taxes	500us-gaap_IncomeTaxesPaid	7,100us-gaap_IncomeTaxesPaid
Changes in accounts payable and accrued liabilities related to purchases of property, plant, and equipment	83,566	309
Non-cash reductions to oil and natural gas properties related to asset retirement obligations	$ 6,087	$ 14,972

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