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Fair Value Measurements on a Recurring Basis (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Derivative Asset [Abstract]    
Commodity derivatives $ 60,843us-gaap_DerivativeFairValueOfDerivativeAsset $ 28,291us-gaap_DerivativeFairValueOfDerivativeAsset
Commodity derivatives (17,149)us-gaap_DerivativeAssetFairValueGrossLiability [1] (20,184)us-gaap_DerivativeAssetFairValueGrossLiability [1]
Commodity derivatives 43,694us-gaap_DerivativeAssets 8,107us-gaap_DerivativeAssets
Derivative Liability [Abstract]    
Commodity derivatives 17,149us-gaap_DerivativeFairValueOfDerivativeLiability 45,226us-gaap_DerivativeFairValueOfDerivativeLiability
Commodity derivatives (17,149)us-gaap_DerivativeLiabilityFairValueGrossAsset [1] (20,184)us-gaap_DerivativeLiabilityFairValueGrossAsset [1]
Commodity derivatives $ 0us-gaap_DerivativeLiabilities $ 25,042us-gaap_DerivativeLiabilities
[1] Represents counterparty netting under agreements governing such derivatives.