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Mortgage Loans on Real Estate (Mortgage Loans by Credit Quality Indicator) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mortgage Loans on Real Estate [Abstract]      
Performing $ 2,451,760ael_MortgageLoansOnRealEstatePerforming $ 2,593,276ael_MortgageLoansOnRealEstatePerforming  
In workout 0ael_MortgageLoansOnRealEstateInWorkout 6,248ael_MortgageLoansOnRealEstateInWorkout  
Delinquent 0us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans 0us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans  
Collateral dependent 5,961ael_MortgageLoansOnRealEstateCollateralDependent 8,174ael_MortgageLoansOnRealEstateCollateralDependent  
Principal outstanding $ 2,457,721us-gaap_LoansReceivableCommercialRealEstate $ 2,607,698us-gaap_LoansReceivableCommercialRealEstate $ 2,658,883us-gaap_LoansReceivableCommercialRealEstate