Current Ratio Requirement

No definition available.

Name:	dnr_CurrentRatioRequirement
Namespace Prefix:	dnr_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum permitted consolidated EBITDAX to Consolidated Interest charges ratio.

+ References

No definition available.

+ Details

Name:	dnr_EBITDAXtoConsolidatedInterest
Namespace Prefix:	dnr_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Interest in entities which guarantee our debt issuances, expressed as a percentage

+ References

No definition available.

+ Details

Name:	dnr_InterestInGuarantorSubsidiaries
Namespace Prefix:	dnr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum permitted Senior Secured Debt to consolidated EBITDAX ratio.

+ References

No definition available.

+ Details

Name:	dnr_SeniorSecuredDebttoEBITDAX
Namespace Prefix:	dnr_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchasedFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629

+ Details

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

- References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The effective interest rate during the reporting period.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorSubordinatedNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=dnr_SeniorSubordinatedNotesDue2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=dnr_A5.5SeniorSubordinatedNotesDue2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=dnr_SeniorSubordinatedNotesDue2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dnr_CovenantByYearAxis=dnr_Year2017Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dnr_CovenantByPeriodAxis=dnr_Q2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dnr_CovenantByPeriodAxis=dnr_Q3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dnr_CovenantByPeriodAxis=dnr_Q4Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dnr_CovenantByYearAxis=dnr_Year2018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dnr_CovenantByPeriodAxis=dnr_Q1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dnr_CovenantByYearAxis=dnr_Year2019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
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Long-Term Debt (Details Textuals)		3 Months Ended
Long-Term Debt (Details Textuals)	May 05, 2017 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	May 03, 2017 USD ($)
Long Term Debt (Textuals) [Abstract]
Interest in guarantor subsidiaries		100.00%
Debt Instrument, Repurchased Face Amount			$ 152,300,000
Debt Instrument, Repurchase Amount			55,500,000
Gain on debt extinguishment		$ 0	94,991,000
Senior Secured Bank Credit Facility [Abstract]
Weighted average interest rate on Bank Credit Facility		3.20%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.50%
Current Ratio Requirement		1.0
Subsequent Event [Member]
Senior Secured Bank Credit Facility [Abstract]
Line of Credit, Borrowing Base	$ 1,050,000,000.00
Line of Credit Facility, Current Borrowing Capacity	$ 1,050,000,000.00
Senior subordinated notes available for repurchase				$ 148,300,000
Senior Subordinated Notes [Member] \| 6 3/8% Senior Subordinated Notes due 2021
Long Term Debt (Textuals) [Abstract]
Debt Instrument, Repurchased Face Amount			4,000,000
Senior Subordinated Notes [Member] \| 5 1/2% Senior Subordinated Notes due 2022
Long Term Debt (Textuals) [Abstract]
Debt Instrument, Repurchased Face Amount			42,300,000
Senior Subordinated Notes [Member] \| 4 5/8% Senior Subordinated Notes due 2023
Long Term Debt (Textuals) [Abstract]
Debt Instrument, Repurchased Face Amount			$ 106,000,000
Year 2017 \| Q2 \| Subsequent Event [Member]
Senior Secured Bank Credit Facility [Abstract]
Senior Secured Debt to Consolidated EBITDAX	3.0
Consolidated EBITDAX to Consolidated Interest Charges	1.25
Year 2017 \| Q3 \| Subsequent Event [Member]
Senior Secured Bank Credit Facility [Abstract]
Senior Secured Debt to Consolidated EBITDAX	3.0
Consolidated EBITDAX to Consolidated Interest Charges	1.25
Year 2017 \| Q4 \| Subsequent Event [Member]
Senior Secured Bank Credit Facility [Abstract]
Senior Secured Debt to Consolidated EBITDAX	3.0
Consolidated EBITDAX to Consolidated Interest Charges	1.25
Year 2018 \| Q1 \| Subsequent Event [Member]
Senior Secured Bank Credit Facility [Abstract]
Senior Secured Debt to Consolidated EBITDAX	3.0
Consolidated EBITDAX to Consolidated Interest Charges	1.25
Year 2018 \| Q2 \| Subsequent Event [Member]
Senior Secured Bank Credit Facility [Abstract]
Senior Secured Debt to Consolidated EBITDAX	2.5
Consolidated EBITDAX to Consolidated Interest Charges	1.25
Year 2018 \| Q3 \| Subsequent Event [Member]
Senior Secured Bank Credit Facility [Abstract]
Senior Secured Debt to Consolidated EBITDAX	2.5
Consolidated EBITDAX to Consolidated Interest Charges	1.25
Year 2018 \| Q4 \| Subsequent Event [Member]
Senior Secured Bank Credit Facility [Abstract]
Senior Secured Debt to Consolidated EBITDAX	2.5
Consolidated EBITDAX to Consolidated Interest Charges	1.25
Year 2019 \| Q1 \| Subsequent Event [Member]
Senior Secured Bank Credit Facility [Abstract]
Senior Secured Debt to Consolidated EBITDAX	2.5
Consolidated EBITDAX to Consolidated Interest Charges	1.25
Year 2019 \| Q2 \| Subsequent Event [Member]
Senior Secured Bank Credit Facility [Abstract]
Senior Secured Debt to Consolidated EBITDAX	2.5
Consolidated EBITDAX to Consolidated Interest Charges	1.25
Year 2019 \| Q3 \| Subsequent Event [Member]
Senior Secured Bank Credit Facility [Abstract]
Senior Secured Debt to Consolidated EBITDAX	2.5
Consolidated EBITDAX to Consolidated Interest Charges	1.25
Base Rate [Member] \| Minimum \| Senior Secured Bank Credit Facility \| Subsequent Event [Member]
Senior Secured Bank Credit Facility [Abstract]
Interest rate margins on Senior Secured Bank Credit Facility	1.50%
Base Rate [Member] \| Maximum \| Senior Secured Bank Credit Facility \| Subsequent Event [Member]
Senior Secured Bank Credit Facility [Abstract]
Interest rate margins on Senior Secured Bank Credit Facility	2.50%
London Interbank Offered Rate (LIBOR) [Member] \| Minimum \| Senior Secured Bank Credit Facility \| Subsequent Event [Member]
Senior Secured Bank Credit Facility [Abstract]
Interest rate margins on Senior Secured Bank Credit Facility	2.50%
London Interbank Offered Rate (LIBOR) [Member] \| Maximum \| Senior Secured Bank Credit Facility \| Subsequent Event [Member]
Senior Secured Bank Credit Facility [Abstract]
Interest rate margins on Senior Secured Bank Credit Facility	3.50%