Condensed Consolidated Statements 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)	$ (107,746)us-gaap_NetIncomeLoss	$ 58,310us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to cash flow from operating activities
Depletion, depreciation, and amortization	149,958	141,130
Write-down of oil and natural gas properties	146,200us-gaap_ImpairmentOfOilAndGasProperties	0us-gaap_ImpairmentOfOilAndGasProperties
Deferred income taxes	(66,036)us-gaap_DeferredIncomeTaxExpenseBenefit	30,175us-gaap_DeferredIncomeTaxExpenseBenefit
Stock-based compensation	7,849us-gaap_ShareBasedCompensation	8,346us-gaap_ShareBasedCompensation
Commodity derivatives expense (income)	(83,076)	76,669
Settlements of commodity derivatives	148,465dnr_SettlementsofCommodityDerivatives	(27,169)dnr_SettlementsofCommodityDerivatives
Amortization of debt issuance costs and discounts	2,221	3,520
Other, net	(2,359)us-gaap_OtherNoncashIncomeExpense	(2,297)us-gaap_OtherNoncashIncomeExpense
Changes in assets and liabilities, net of effects from acquisitions
Accrued production receivable	33,636	(24,937)
Trade and other receivables	16,828us-gaap_IncreaseDecreaseInReceivables	6,372us-gaap_IncreaseDecreaseInReceivables
Other current and long-term assets	(6,136)	(5,459)
Accounts payable and accrued liabilities	(83,248)	(52,580)
Oil and natural gas production payable	(17,716)	3,916
Other liabilities	(1,076)	(1,138)
Net cash provided by operating activities	137,764	214,858
Cash flows from investing activities
Oil and natural gas capital expenditures	(162,192)	(198,237)
Acquisitions of oil and natural gas properties	(261)	0
CO2 capital expenditures	(14,855)	(15,909)
Pipelines and plants capital expenditures	(12,455)	(22,597)
Purchases of other assets	(2,965)	(1,645)
Other	150	1,634
Net cash used in investing activities	(192,578)	(236,754)
Cash flows from financing activities
Bank repayments	(595,000)us-gaap_RepaymentsOfBankDebt	(815,000)us-gaap_RepaymentsOfBankDebt
Bank borrowings	665,000us-gaap_ProceedsFromBankDebt	1,075,000us-gaap_ProceedsFromBankDebt
Common stock repurchase program	0	(211,356)
Cash dividends paid	(22,068)us-gaap_PaymentsOfDividendsCommonStock	(21,727)us-gaap_PaymentsOfDividendsCommonStock
Other	(10,250)	(9,316)
Net cash provided by financing activities	37,682	17,601
Net decrease in cash and cash equivalents	(17,132)	(4,295)
Cash and cash equivalents at beginning of period	23,153	12,187
Cash and cash equivalents at end of period	$ 6,021	$ 7,892

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