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Derivative Instruments and Hedging Activities (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Derivative Assets    
Gross amounts of recognized assets $ 137,603us-gaap_DerivativeFairValueOfDerivativeAsset $ 13,792us-gaap_DerivativeFairValueOfDerivativeAsset
Gross amounts offset in the statement of financial position 0us-gaap_DerivativeAssetFairValueGrossLiability (10,773)us-gaap_DerivativeAssetFairValueGrossLiability
Net amounts of assets presented in the statement of financial position 137,603us-gaap_DerivativeAssets 3,019us-gaap_DerivativeAssets
Gross amounts of financial instruments not offset in the statement of financial position (2,338)us-gaap_DerivativeCollateralObligationToReturnCash (373)us-gaap_DerivativeCollateralObligationToReturnCash
Net amount 139,941us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral 3,392us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
Derivative Liabilities    
Gross amounts of recognized liabilities 0us-gaap_DerivativeFairValueOfDerivativeLiability 24,685us-gaap_DerivativeFairValueOfDerivativeLiability
Gross amounts offset in the statement of financial position 0cog_DerivativeLiabilityFairValueGrossAsset1 (10,773)cog_DerivativeLiabilityFairValueGrossAsset1
Net amounts of liabilities presented in the statement of financial position 0cog_DerivativeLiabilities1 13,912cog_DerivativeLiabilities1
Gross amounts of financial instruments not offset in the statement of financial position 0us-gaap_DerivativeCollateralRightToReclaimCash 0us-gaap_DerivativeCollateralRightToReclaimCash
Net amount $ 0cog_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral1 $ 13,912cog_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral1