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Derivative Instruments and Hedging Activities (Details) (Derivatives Designated as Hedging Instruments) | Dec. 31, 2013 MMcf
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Natural Gas Collars with contract period of Jan. 2014 - Dec. 2014 Tranche 1 |
Derivative disclosures |
Volume | 336,800
Natural Gas Collars with contract period of Jan. 2014 - Dec. 2014 Tranche 1 | Minimum |
Derivative disclosures |
Collar Floor Price | 3.60
Collar Ceiling Price | 4.22
Natural Gas Collars with contract period of Jan. 2014 - Dec. 2014 Tranche 1 | Maximum |
Derivative disclosures |
Collar Floor Price | 4.37
Collar Ceiling Price | 4.80
Natural Gas Collars with contract period of Jan. 2014 - Dec. 2014 Tranche 1 | Weighted Average |
Derivative disclosures |
Collar Floor Price | 4.13
Collar Ceiling Price | 4.51
Natural Gas Swaps with contract period of Jan. 2014 - Dec. 2014 | Weighted Average |
Derivative disclosures |
Volume | 35,500
Swaps Weighted Average | 4.12

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- Definition Aggregate notional amount of price risk derivatives for instruments with notional amounts expressed in nonmonetary units. + References No definition available. + Details
Name: | cog_NonmonetaryNotionalAmountOfPriceRiskDerivatives1
Namespace Prefix: | cog_
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | instant

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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
Name: | us-gaap_DerivativeCapPrice
Namespace Prefix: | us-gaap_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant

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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
Name: | us-gaap_DerivativeFloorPrice
Namespace Prefix: | us-gaap_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Average fixed price related to the group of price risk swap derivatives. + References No definition available. + Details
Name: | us-gaap_DerivativeSwapTypeAverageFixedPrice
Namespace Prefix: | us-gaap_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant