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Property and Equipment (Summary of Unevaluated Properties Excluded from Amortization) (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Summary of unevaluated properties excluded from oil and natural gas properties being amortized        
Property acquisition costs $ 6,500us-gaap_AcquisitionCosts $ 215,822us-gaap_AcquisitionCosts $ 102,377us-gaap_AcquisitionCosts $ 329,840us-gaap_AcquisitionCosts
Exploration and development 125,783us-gaap_DevelopmentCosts 40,835us-gaap_DevelopmentCosts 22,080us-gaap_DevelopmentCosts 10,361us-gaap_DevelopmentCosts
Capitalized interest 21,807dnr_CapitalizedInterestCostsPeriodCost 24,898dnr_CapitalizedInterestCostsPeriodCost 12,084dnr_CapitalizedInterestCostsPeriodCost 6,019dnr_CapitalizedInterestCostsPeriodCost
Total 154,090us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization 281,555us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization 136,541us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization 346,220us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization
Property acquisition costs 654,539us-gaap_AcquisitionCostsCumulative      
Exploration and development 199,059us-gaap_DevelopmentCostsCumulative      
Capitalized interest 64,808dnr_CapitalizedInterestCostsCumulative      
Total $ 918,406us-gaap_CapitalizedCostsUnprovedProperties $ 780,481us-gaap_CapitalizedCostsUnprovedProperties