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Summary of Offsetting Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Derivative instruments (assets)    
Gross fair value of recognized assets $ 68,382gac_DerivativeFairValueOfDerivativeAssetIncludingAccruals [1],[2] $ 32,895gac_DerivativeFairValueOfDerivativeAssetIncludingAccruals [1],[3]
Financial instruments (45,795)us-gaap_DerivativeAssetFairValueGrossLiability [1] (32,595)us-gaap_DerivativeAssetFairValueGrossLiability [1]
Cash collateral received 13,176us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset [1] 279us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset [1]
Net fair value 9,411us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral [1] 21us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral [1]
Short-term reverse repurchase agreements    
Gross fair value of recognized assets 600,000us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross [2],[4]  
Financial instruments (600,000)us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability [4]  
Cash collateral received 0us-gaap_SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnSecurities [4]  
Net fair value 0us-gaap_SecuritiesPurchasedUnderAgreementsToResellAmountOffsetAgainstCollateral [4]  
Financial instruments (assets)    
Gross fair value of recognized assets 668,382us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross [2]  
Financial instruments (645,795)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability  
Cash collateral received 13,176us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash  
Net fair value 9,411us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral  
Derivatives instrument (liabilities)    
Gross fair value of recognized assets/liabilities 101,899gac_DerivativeFairValueOfDerivativeLiabilityIncludingAccruals [2],[5] 140,655gac_DerivativeFairValueOfDerivativeLiabilityIncludingAccruals [3],[5]
Financial Instruments (45,795)us-gaap_DerivativeLiabilityFairValueGrossAsset [5] (32,595)us-gaap_DerivativeLiabilityFairValueGrossAsset [5]
Cash collateral received/(pledged) (56,099)us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset [5] (105,929)us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset [5]
Net fair value $ 5us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral [5] $ 2,131us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral [5]
[1] The estimated fair value of derivative instrument assets is reported in other assets in the condensed consolidated balance sheets. The estimated fair value of derivative transactions entered into under ISDA master agreements include income and expense accruals.
[2] The gross fair value of derivative instrument and short-term reverse repurchase agreement assets are not netted against offsetting liabilities for presentation on the condensed consolidated balance sheets.
[3] The gross fair value of derivative instrument assets is not netted against offsetting liabilities for presentation on the condensed consolidated balance sheets.
[4] The estimated fair value of short-term reverse repurchase agreement assets is reported in short-term investments in the condensed consolidated balance sheets. The collateral is held by an independent third-party custodian under a tri-party agreement.
[5] The estimated fair value of derivative instrument liabilities is reported in other liabilities in the condensed consolidated balance sheets. Derivative transactions entered into under ISDA master agreements include income and expense accruals.