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 income	$ 635,491us-gaap_NetIncomeLoss	$ 409,597us-gaap_NetIncomeLoss	$ 525,360us-gaap_NetIncomeLoss
Adjustments to reconcile net income to cash flows from operating activities
Depletion, depreciation, and amortization	592,972	509,943	507,538
Deferred income taxes	429,973us-gaap_DeferredIncomeTaxExpenseBenefit	222,526us-gaap_DeferredIncomeTaxExpenseBenefit	255,743us-gaap_DeferredIncomeTaxExpenseBenefit
Stock-based compensation	30,513us-gaap_ShareBasedCompensation	33,003us-gaap_ShareBasedCompensation	29,310us-gaap_ShareBasedCompensation
Commodity derivatives expense (income)	(555,255)	41,024	(4,834)
Settlements of commodity derivatives	1,421dnr_SettlementsofCommodityDerivatives	(662)dnr_SettlementsofCommodityDerivatives	17,880dnr_SettlementsofCommodityDerivatives
Loss on early extinguishment of debt	113,908	44,651	0
Amortization of debt issuance costs and discounts	13,476	14,023	14,695
Impairment of assets	0us-gaap_OtherAssetImpairmentCharges	0us-gaap_OtherAssetImpairmentCharges	17,515us-gaap_OtherAssetImpairmentCharges
Other, net	6,311us-gaap_OtherNoncashIncomeExpense	(2,318)us-gaap_OtherNoncashIncomeExpense	16,917us-gaap_OtherNoncashIncomeExpense
Changes in assets and liabilities, net of effects from acquisitions
Accrued production receivable	80,285	(15,085)	36,234
Trade and other receivables	(78,469)us-gaap_IncreaseDecreaseInReceivables	4,981us-gaap_IncreaseDecreaseInReceivables	45,836us-gaap_IncreaseDecreaseInReceivables
Other current and long-term assets	3,174	10,462	7,688
Accounts payable and accrued liabilities	501	91,816	5,828
Oil and natural gas production payable	(46,506)	12,731	(23,460)
Other liabilities	(4,970)	(15,497)	(41,359)
Net cash provided by operating activities	1,222,825	1,361,195	1,410,891
Cash flows from investing activities
Oil and natural gas capital expenditures	(946,846)	(900,221)	(1,122,615)
Acquisitions of oil and natural gas properties	(8,773)	(9,243)	(156,082)
Bakken exchange transaction	0	(10,385)	281,669
CO2 capital expenditures	(48,134)	(93,744)	(131,043)
Pipelines and plants capital expenditures	(72,151)	(184,286)	(330,417)
Purchases of other assets	(3,197)	(65,987)	(25,765)
Net proceeds from sales of oil and natural gas properties and equipment	3,453	8,037	34,750
Net proceeds from sale of short-term investments	0	0	83,545
Other	(1,107)	(19,480)	(10,883)
Net cash used in investing activities	(1,076,755)	(1,275,309)	(1,376,841)
Cash flows from financing activities
Bank repayments	(2,609,000)us-gaap_RepaymentsOfBankDebt	(1,550,000)us-gaap_RepaymentsOfBankDebt	(1,555,000)us-gaap_RepaymentsOfBankDebt
Bank borrowings	2,664,000us-gaap_ProceedsFromBankDebt	1,190,000us-gaap_ProceedsFromBankDebt	1,870,000us-gaap_ProceedsFromBankDebt
Repayment of senior subordinated notes	(997,345)us-gaap_RepaymentsOfSubordinatedDebt	(651,270)us-gaap_RepaymentsOfSubordinatedDebt	0us-gaap_RepaymentsOfSubordinatedDebt
Premium paid on repayment of senior subordinated notes	(101,342)	(36,475)	0
Net proceeds from issuance of senior subordinated notes	1,250,000	1,200,000	0
Costs of debt financing	(24,407)us-gaap_PaymentsOfFinancingCosts	(20,161)us-gaap_PaymentsOfFinancingCosts	(34)us-gaap_PaymentsOfFinancingCosts
Common stock repurchase program	(211,356)	(281,958)	(251,480)
Cash dividends paid	(87,044)us-gaap_PaymentsOfDividendsCommonStock	0us-gaap_PaymentsOfDividendsCommonStock	0us-gaap_PaymentsOfDividendsCommonStock
Other	(18,610)	(22,346)	(17,718)
Net cash provided by (used in) financing activities	(135,104)	(172,210)	45,768
Net increase (decrease) in cash and cash equivalents	10,966	(86,324)	79,818
Cash and cash equivalents at beginning of year	12,187	98,511	18,693
Cash and cash equivalents at end of year	$ 23,153	$ 12,187	$ 98,511

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Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow from bank borrowing during the year.

+ References

+ Details

Name:	us-gaap_ProceedsFromBankDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from a borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in liquidation of the entity's assets or underlying collateral.

+ References

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

+ Details

Name:	us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the sale of equity securities classified as available-for-sale securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (b)

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

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

+ Details

Name:	us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.

+ References

+ Details

Name:	us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow to settle a bank borrowing during the year.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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

+ Details

Name:	us-gaap_RepaymentsOfBankDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow from the repayment of long-term borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in case of liquidation of the entity's assets or underlying collateral.

+ References

+ Details

Name:	us-gaap_RepaymentsOfSubordinatedDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration