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Derivative Instruments (Narrative) (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2014
partial_unwind_agreement
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
partial_unwind_agreement
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
partial_unwind_agreement
Dec. 31, 2013
partial_unwind_agreement
Dec. 31, 2012
Sep. 30, 2010
Derivative Instruments and Hedging Activities Disclosure [Abstract]                        
Credit risk, maximum exposure                 $ 47,400,000us-gaap_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure $ 71,700,000us-gaap_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure    
Number of partial unwind agreements 5ael_NumberOfPartialUnwindAgreements       3ael_NumberOfPartialUnwindAgreements       5ael_NumberOfPartialUnwindAgreements 3ael_NumberOfPartialUnwindAgreements    
Net cash received from counterparties for settlement of call options and warrants                 16,600,000ael_NetCashReceivedFromCounterpartiesForSettlementofCallOptionsandWarrants 22,200,000ael_NetCashReceivedFromCounterpartiesForSettlementofCallOptionsandWarrants    
Warrants reclassified from equity to a derivative liability, at fair value                 (51,257,000)ael_WarrantsReclassifiedFromEquitytoLiabilityAtFairValue (47,991,000)ael_WarrantsReclassifiedFromEquitytoLiabilityAtFairValue    
Derivative [Line Items]                        
Derivative collateral 743,000,000us-gaap_DerivativeCollateralObligationToReturnCash       818,200,000us-gaap_DerivativeCollateralObligationToReturnCash       743,000,000us-gaap_DerivativeCollateralObligationToReturnCash 818,200,000us-gaap_DerivativeCollateralObligationToReturnCash    
Change in fair value of embedded derivatives                 (32,321,000)us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet (133,968,000)us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet (286,899,000)us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet  
Net income 31,217,000us-gaap_NetIncomeLoss 67,815,000us-gaap_NetIncomeLoss 36,744,000us-gaap_NetIncomeLoss (9,753,000)us-gaap_NetIncomeLoss 50,958,000us-gaap_NetIncomeLoss 56,181,000us-gaap_NetIncomeLoss 120,113,000us-gaap_NetIncomeLoss 26,031,000us-gaap_NetIncomeLoss 126,023,000us-gaap_NetIncomeLoss 253,283,000us-gaap_NetIncomeLoss 57,798,000us-gaap_NetIncomeLoss  
2015 Notes Hedges [Member]                        
Derivative [Line Items]                        
Number of counterparties                       2ael_NumberofCounterparties
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OptionOnSecuritiesMember
Conversion spread, shares of common stock 1.8ael_DerivativeConversionSpreadShares
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OptionOnSecuritiesMember
              1.8ael_DerivativeConversionSpreadShares
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OptionOnSecuritiesMember
    16.0ael_DerivativeConversionSpreadShares
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OptionOnSecuritiesMember
Derivative asset, strike price $ 12.25ael_DerivativeAssetStrikePrice
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OptionOnSecuritiesMember
              $ 12.25ael_DerivativeAssetStrikePrice
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OptionOnSecuritiesMember
    $ 12.50ael_DerivativeAssetStrikePrice
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OptionOnSecuritiesMember
2015 Warrants [Member]                        
Derivative [Line Items]                        
Number of securities called by warrants                       16.0us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_WarrantMember
Warrants, exercise price                 $ 15.68invest_InvestmentWarrantsExercisePrice
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_WarrantMember
    $ 16.00invest_InvestmentWarrantsExercisePrice
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_WarrantMember
Proceeds from issuance of warrants                       15,600,000us-gaap_ProceedsFromIssuanceOfWarrants
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_WarrantMember
September 2015 Notes [Member]                        
Derivative [Line Items]                        
Principal amount of convertible senior notes payable at issuance                       200,000,000ael_PrincipalAmountOfConvertibleSeniorNotesPayableAtIssuance
/ us-gaap_DebtInstrumentAxis
= ael_ConvertibleDebtIssuedIn2010Member
Interest rate 3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ael_ConvertibleDebtIssuedIn2010Member
              3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ael_ConvertibleDebtIssuedIn2010Member
     
SunTrust [Member] | Not Designated as Hedging Instrument [Member]                        
Derivative [Line Items]                        
Derivative instruments, interest rate swaps and caps, duration                 7 years      
SunTrust [Member] | Three Month London Interbank Offered Rate (LIBOR) [Member] | Not Designated as Hedging Instrument [Member]                        
Derivative [Line Items]                        
Cap rate 2.50%us-gaap_DerivativeCapInterestRate
/ us-gaap_CounterpartyNameAxis
= ael_DerivativeCounterpartySuntrustMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_VariableRateAxis
= ael_ThreeMonthLondonInterbankOfferedRateLIBORMember
              2.50%us-gaap_DerivativeCapInterestRate
/ us-gaap_CounterpartyNameAxis
= ael_DerivativeCounterpartySuntrustMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_VariableRateAxis
= ael_ThreeMonthLondonInterbankOfferedRateLIBORMember
     
Change in Assumptions for Fair Value [Member]                        
Derivative [Line Items]                        
Change in fair value of embedded derivatives                 (62,600,000)us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= ael_ChangeinAssumptionsforFairValueMember
     
Net income                 $ 14,800,000us-gaap_NetIncomeLoss
/ us-gaap_ChangeInAccountingEstimateByTypeAxis
= ael_ChangeinAssumptionsforFairValueMember
     
Call Options [Member]                        
Derivative [Line Items]                        
Investment maturity period                 1 year