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v2.4.1.9

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

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- Definition Amount before tax of increase (decrease) in accumulated in equity from transactions and other events and circumstances from non-owner sources. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners). + References No definition available. + Details
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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994 + Details
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- Definition The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract. + References No definition available. + Details
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- Definition Floor rate on a price risk derivative such as a floor or a collar. A payment or receipt is triggered if the market rate falls below the floor rate on the contract. + References No definition available. + Details
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- Definition Average fixed price related to the group of price risk swap derivatives. + References No definition available. + Details
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