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Other Comprehensive Income (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Before-tax amount      
Unrealized holding gains (losses) arising during the period on available-for-sale fixed maturity investments $ 586,458us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax $ (718,735)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax $ 534,028us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Unrealized holding gains (losses) arising during the period on cash flow hedges 20,137us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax 3,102us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax (18,881)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
Reclassification adjustment for (gains) losses realized in net income (56,159)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesBeforeTax (42,982)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesBeforeTax (107,713)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesBeforeTax
Net unrealized gains (losses) related to investments 550,436gac_OtherComprehensiveIncomeLossNetUnrealizedGainLossBeforeFuturePolicyBenefitsDeferredAcquisitionCostsAndVOBAAdjustmentsBeforeTax (758,615)gac_OtherComprehensiveIncomeLossNetUnrealizedGainLossBeforeFuturePolicyBenefitsDeferredAcquisitionCostsAndVOBAAdjustmentsBeforeTax 407,434gac_OtherComprehensiveIncomeLossNetUnrealizedGainLossBeforeFuturePolicyBenefitsDeferredAcquisitionCostsAndVOBAAdjustmentsBeforeTax
Future policy benefits, DAC and VOBA adjustments (58,760)gac_OtherComprehensiveIncomeFuturePolicyBenefitsDeferredAcquisitionCostsAndValueOfBusinessAcquiredAdjustmentsBeforeTax 190,995gac_OtherComprehensiveIncomeFuturePolicyBenefitsDeferredAcquisitionCostsAndValueOfBusinessAcquiredAdjustmentsBeforeTax (83,835)gac_OtherComprehensiveIncomeFuturePolicyBenefitsDeferredAcquisitionCostsAndValueOfBusinessAcquiredAdjustmentsBeforeTax
Net unrealized gains (losses) 491,676gac_OtherComprehensiveIncomeLossNetUnrealizedGainLossBeforeTax (567,620)gac_OtherComprehensiveIncomeLossNetUnrealizedGainLossBeforeTax 323,599gac_OtherComprehensiveIncomeLossNetUnrealizedGainLossBeforeTax
Employee benefit plan adjustment (95,886)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent 121,551us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent (68,650)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent
Other comprehensive income (loss) before income taxes 395,790us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent (446,069)us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent 254,949us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
Tax (expense) benefit      
Unrealized holding gains (losses) arising during the period on available-for-sale fixed maturity investments (205,260)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax 251,557us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax (186,910)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Unrealized holding gains (losses) arising during the period on cash flow hedges (7,048)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax (1,086)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax 6,608us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax
Reclassification adjustment for (gains) losses realized in net income 19,656us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesTax 15,044us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesTax 37,700us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesTax
Net unrealized gains (losses) (192,652)gac_OtherComprehensiveIncomeLossNetUnrealizedGainLossBeforeFuturePolicyBenefitsDeferredAcquisitionCostsAndVOBAAdjustmentsTax 265,515gac_OtherComprehensiveIncomeLossNetUnrealizedGainLossBeforeFuturePolicyBenefitsDeferredAcquisitionCostsAndVOBAAdjustmentsTax (142,602)gac_OtherComprehensiveIncomeLossNetUnrealizedGainLossBeforeFuturePolicyBenefitsDeferredAcquisitionCostsAndVOBAAdjustmentsTax
Future policy benefits, DAC and VOBA adjustments 20,566gac_OtherComprehensiveIncomeLossFuturePolicyBenefitsDeferredAcquisitionCostsAndValueOfBusinessAcquiredAdjustmentsTax (66,848)gac_OtherComprehensiveIncomeLossFuturePolicyBenefitsDeferredAcquisitionCostsAndValueOfBusinessAcquiredAdjustmentsTax 29,343gac_OtherComprehensiveIncomeLossFuturePolicyBenefitsDeferredAcquisitionCostsAndValueOfBusinessAcquiredAdjustmentsTax
Net unrealized gains (losses) (172,086)gac_OtherComprehensiveIncomeLossNetUnrealizedGainLossTax 198,667gac_OtherComprehensiveIncomeLossNetUnrealizedGainLossTax (113,259)gac_OtherComprehensiveIncomeLossNetUnrealizedGainLossTax
Employee benefit plan adjustment 33,560us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent (42,543)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent 24,027us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent
Other comprehensive income (loss) (138,526)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 156,124us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 (89,232)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
Net-of-tax amount      
Unrealized holding gains (losses) arising during the period on available-for-sale fixed maturity investments 381,198us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (467,178)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 347,118us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Unrealized holding gains (losses) arising during the period on cash flow hedges 13,089us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 2,016us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax (12,273)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Reclassification adjustment for (gains) losses realized in net income (36,503)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax (27,938)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax (70,013)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax
Net unrealized gains (losses) 357,784gac_OtherComprehensiveIncomeLossNetUnrealizedGainLossBeforeFuturePolicyBenefitsDeferredAcquisitionCostsAndVOBAAdjustmentsNetOfTax (493,100)gac_OtherComprehensiveIncomeLossNetUnrealizedGainLossBeforeFuturePolicyBenefitsDeferredAcquisitionCostsAndVOBAAdjustmentsNetOfTax 264,832gac_OtherComprehensiveIncomeLossNetUnrealizedGainLossBeforeFuturePolicyBenefitsDeferredAcquisitionCostsAndVOBAAdjustmentsNetOfTax
Future policy benefits, DAC and VOBA adjustments (38,194)gac_OtherComprehensiveIncomeLossFuturePolicyBenefitsDeferredAcquisitionCostsAndValueOfBusinessAcquiredAdjustmentsNetOfTax 124,147gac_OtherComprehensiveIncomeLossFuturePolicyBenefitsDeferredAcquisitionCostsAndValueOfBusinessAcquiredAdjustmentsNetOfTax (54,492)gac_OtherComprehensiveIncomeLossFuturePolicyBenefitsDeferredAcquisitionCostsAndValueOfBusinessAcquiredAdjustmentsNetOfTax
Net unrealized gains (losses) 319,590gac_OtherComprehensiveIncomeLossNetUnrealizedGainLossNetOfTax (368,953)gac_OtherComprehensiveIncomeLossNetUnrealizedGainLossNetOfTax 210,340gac_OtherComprehensiveIncomeLossNetUnrealizedGainLossNetOfTax
Employee benefit plan adjustment (62,326)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent 79,008us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent (44,623)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent
Net current period other comprehensive income (loss) $ 257,264us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent [1] $ (289,945)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent [1] $ 165,717us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent [1]
[1] Other comprehensive income (loss) includes the non-credit component of impaired losses on fixed maturities available-for-sale, net of future policy benefits, DAC and VOBA adjustments and income taxes, in the amounts of $177, $18,388 and $26,583 for the years ended December 31, 2014, 2013 and 2012, respectively.