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Derivative Instruments (Fair Value of Derivative Instruments as Presented in the Consolidated Balance Sheets) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Derivative assets $ 610,764us-gaap_DerivativeAssets $ 731,113us-gaap_DerivativeAssets
Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 643,714us-gaap_DerivativeAssets
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
764,182us-gaap_DerivativeAssets
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Derivative liabilities 5,899,969us-gaap_DerivativeLiabilities
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
5,607,588us-gaap_DerivativeLiabilities
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Call Options [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 610,764us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
731,113us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CallOptionMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
2015 Notes Hedges [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 30,858us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OptionOnSecuritiesMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
30,291us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OptionOnSecuritiesMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Interest Rate Caps [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 2,092us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateCapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
2,778us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateCapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Fixed Index Annuities - Embedded Derivatives [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 5,865,171us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= ael_FixedIndexAnnuityEmbeddedDerivativeFinancialInstrumentsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
5,574,653us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= ael_FixedIndexAnnuityEmbeddedDerivativeFinancialInstrumentsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
2015 Notes Embedded Conversion Derivative [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 30,858us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= ael_A2015NotesEmbeddedConversionDerivativeMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
30,291us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= ael_A2015NotesEmbeddedConversionDerivativeMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities $ 3,940us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
$ 2,644us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember