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Derivative Instruments and Hedging Activities (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Apr. 01, 2014
Derivative disclosures      
Unrealized losses included in accumulated other comprehensive income and will reclassified into natural gas and crude oil revenues , pre-tax     $ 73,400,000us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1
Unrealized losses included in accumulated other comprehensive income and will reclassified into natural gas and crude oil revenues , net of tax $ 0us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax $ 0us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax $ 44,200,000us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
Derivatives Designated as Hedges | Natural Gas Collars with contract period of April 2015 - December 2015      
Derivative disclosures      
Volume 53,400.0cog_NonmonetaryNotionalAmountOfPriceRiskDerivatives1
/ us-gaap_DerivativeByNatureAxis
= cog_NaturalGasCollarWithContractPeriodOfApril2015ToDecember2015Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
   
Derivatives Designated as Hedges | Natural Gas Collars with contract period of April 2015 - December 2015 | Minimum      
Derivative disclosures      
Collar Floor Price 3.86us-gaap_DerivativeFloorPrice
/ us-gaap_DerivativeByNatureAxis
= cog_NaturalGasCollarWithContractPeriodOfApril2015ToDecember2015Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Collar Ceiling Price 4.27us-gaap_DerivativeCapPrice
/ us-gaap_DerivativeByNatureAxis
= cog_NaturalGasCollarWithContractPeriodOfApril2015ToDecember2015Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Derivatives Designated as Hedges | Natural Gas Collars with contract period of April 2015 - December 2015 | Maximum      
Derivative disclosures      
Collar Floor Price 3.91us-gaap_DerivativeFloorPrice
/ us-gaap_DerivativeByNatureAxis
= cog_NaturalGasCollarWithContractPeriodOfApril2015ToDecember2015Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Collar Ceiling Price 4.43us-gaap_DerivativeCapPrice
/ us-gaap_DerivativeByNatureAxis
= cog_NaturalGasCollarWithContractPeriodOfApril2015ToDecember2015Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Derivatives Designated as Hedges | Natural Gas Collars with contract period of April 2015 - December 2015 | Weighted Average      
Derivative disclosures      
Collar Floor Price 3.87us-gaap_DerivativeFloorPrice
/ us-gaap_DerivativeByNatureAxis
= cog_NaturalGasCollarWithContractPeriodOfApril2015ToDecember2015Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
   
Collar Ceiling Price 4.35us-gaap_DerivativeCapPrice
/ us-gaap_DerivativeByNatureAxis
= cog_NaturalGasCollarWithContractPeriodOfApril2015ToDecember2015Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
   
Derivatives Designated as Hedges | Natural Gas Swaps with contract period of April 2015 - December 2015      
Derivative disclosures      
Volume 53,400.0cog_NonmonetaryNotionalAmountOfPriceRiskDerivatives1
/ us-gaap_DerivativeByNatureAxis
= cog_NaturalGasSwapWithContractPeriodOfApril2015ToDecember2015Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
   
Derivatives Designated as Hedges | Natural Gas Swaps with contract period of April 2015 - December 2015 | Weighted Average      
Derivative disclosures      
Swaps Weighted Average 3.92us-gaap_DerivativeSwapTypeAverageFixedPrice
/ us-gaap_DerivativeByNatureAxis
= cog_NaturalGasSwapWithContractPeriodOfApril2015ToDecember2015Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
   
Derivatives Designated as Hedges | Natural Gas Swaps with contract period of April 2015 - October 2015      
Derivative disclosures      
Volume 31,200.0cog_NonmonetaryNotionalAmountOfPriceRiskDerivatives1
/ us-gaap_DerivativeByNatureAxis
= cog_NaturalGasSwapsWithContractPeriodofApril2015ToOctober2015Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
   
Derivatives Designated as Hedges | Natural Gas Swaps with contract period of April 2015 - October 2015 | Weighted Average      
Derivative disclosures      
Swaps Weighted Average 3.36us-gaap_DerivativeSwapTypeAverageFixedPrice
/ us-gaap_DerivativeByNatureAxis
= cog_NaturalGasSwapsWithContractPeriodofApril2015ToOctober2015Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember