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Summary of Offsetting Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Derivative instruments (assets)    
Gross fair value of recognized assets $ 32,895gac_DerivativeFairValueOfDerivativeAssetIncludingAccruals [1],[2] $ 25,250gac_DerivativeFairValueOfDerivativeAssetIncludingAccruals [1],[2]
Assets Gross fair value not offset in balance sheets    
Financial instruments (32,595)us-gaap_DerivativeCollateralObligationToReturnSecurities [2] (25,023)us-gaap_DerivativeCollateralObligationToReturnSecurities [2]
Cash collateral pledged 279us-gaap_DerivativeCollateralObligationToReturnCash [2]  
Net fair value 21us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral [2] 227us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral [2]
Derivatives instrument (liabilities)    
Gross fair value of recognized liabilities 140,655gac_DerivativeFairValueOfDerivativeLiabilityIncludingAccruals [1],[3] 171,387gac_DerivativeFairValueOfDerivativeLiabilityIncludingAccruals [1],[3]
Liabilities Gross fair value not offset in balance sheets    
Financial Instruments (32,595)us-gaap_DerivativeCollateralRightToReclaimSecurities [3] (25,023)us-gaap_DerivativeCollateralRightToReclaimSecurities [3]
Cash collateral pledged (105,929)us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset [3] (143,540)us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset [3]
Net fair value $ 2,131us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral [3] $ 2,824us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral [3]
[1] The gross fair value of derivative instruments are not netted against offsetting liabilities for presentation on the consolidated balance sheets.
[2] The estimated fair value of derivative instrument assets is reported in other assets in the consolidated balance sheets. Derivative transactions entered into under ISDA master agreements include income and expense accruals.
[3] The estimated fair value of derivative instrument liabilities is reported in other liabilities in the consolidated balance sheets. Derivative transactions entered into under ISDA master agreements include income and expense accruals.