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Acquisition (CCA PPA) (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended
Mar. 27, 2013
Business Combinations [Abstract]  
Cash consideration $ 1,001,707us-gaap_PaymentsToAcquireBusinessesGross [1]
Proved properties 783,507dnr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedProvedProperties
Unevaluated properties 222,820dnr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedUnprovedProperties
Other assets 2,589us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
Asset retirement obligations (7,209)dnr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAssetRetirementObligationsNoncurrent
Fair value of net assets acquired $ 1,001,707us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
[1] See Note 6, Income Taxes, for additional information regarding the like-kind-exchange transaction utilized to fund this purchase and Note 13, Supplemental Cash Flow Information, for supplemental cash flow information regarding the cash payment.