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Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax asset    
Deferred acquisition costs $ 2,467gac_DeferredTaxAssetsDeferredExpenseDeferredPolicyAcquisitionCost $ 1,008gac_DeferredTaxAssetsDeferredExpenseDeferredPolicyAcquisitionCost
Policyholder dividends 10,002gac_DeferredTaxAssetsPolicyholderDividends 11,479gac_DeferredTaxAssetsPolicyholderDividends
Net operating loss carryforward 122,177us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 172,414us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Pension plan accrued benefit liability 84,351us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions 53,937us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
Experience rated refunds 13,431gac_DeferredTaxAssetsExperienceRatedRefunds 5,509gac_DeferredTaxAssetsExperienceRatedRefunds
Tax credits 149,516us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 131,052us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Other 11,865us-gaap_DeferredTaxAssetsOther 416us-gaap_DeferredTaxAssetsOther
Total deferred taxes 393,809us-gaap_DeferredTaxAssetsNetNoncurrent 375,815us-gaap_DeferredTaxAssetsNetNoncurrent
Deferred tax liability    
Policyholder reserves 255,926us-gaap_DeferredTaxLiabilitiesDeferredExpenseReservesAndAccruals 253,738us-gaap_DeferredTaxLiabilitiesDeferredExpenseReservesAndAccruals
Investment assets 426,477us-gaap_DeferredTaxLiabilitiesInvestments 203,363us-gaap_DeferredTaxLiabilitiesInvestments
Goodwill 26,022us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill 25,563us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill
Other 0us-gaap_DeferredTaxLiabilitiesOther 0us-gaap_DeferredTaxLiabilitiesOther
Total deferred taxes 708,425us-gaap_DeferredTaxLiabilitiesGrossNoncurrent 482,664us-gaap_DeferredTaxLiabilitiesGrossNoncurrent
Net unrealized losses (gains) on available-for-sale investments 381,838gac_DeferredTaxLiabilitiesUnrealizedLossesGainsOnAvailableForSaleSecurities 209,434gac_DeferredTaxLiabilitiesUnrealizedLossesGainsOnAvailableForSaleSecurities
Subsidiary | Federal    
Federal net operating loss carry forwards generated by a subsidiary    
2021 51,677gac_OperatingLossCarryforwardsExpiringWithinNineYearsFromEndOfCurrentFiscalYear
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
2022 136,796gac_OperatingLossCarryforwardsExpiringWithinTenYearsFromEndOfCurrentFiscalYear
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
2023 81,693gac_OperatingLossCarryforwardsExpiringWithinElevenYearsFromEndOfCurrentFiscalYear
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
2028 3,390gac_OperatingLossCarryforwardsExpiringWithinSixteenYearsFromEndOfCurrentFiscalYear
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
 
Total $ 273,556us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember