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Properties and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Abstract]    
Proved oil and gas properties $ 7,984,979us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod $ 6,362,570us-gaap_ProvedOilAndGasPropertySuccessfulEffortMethod
Unproved oil and gas properties 492,208us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod 375,428us-gaap_UnprovedOilAndGasPropertySuccessfulEffortMethod
Gathering and pipeline systems 241,272cog_GatheringAndPipelineSystems 239,958cog_GatheringAndPipelineSystems
Land, building and other equipment 109,758cog_LandBuildingAndOtherEquipment 94,243cog_LandBuildingAndOtherEquipment
Properties and Equipment, gross, total 8,828,217us-gaap_PropertyPlantAndEquipmentGross 7,072,199us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation, depletion and amortization (3,902,506)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (2,525,972)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Properties and equipment, Net $ 4,925,711us-gaap_PropertyPlantAndEquipmentNet $ 4,546,227us-gaap_PropertyPlantAndEquipmentNet