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Mortgage Loans on Real Estate (Mortgage Loans by Credit Quality Indicator) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mortgage Loans on Real Estate [Abstract]    
Performing $ 2,436,604ael_MortgageLoansOnRealEstatePerforming $ 2,451,760ael_MortgageLoansOnRealEstatePerforming
In workout 9,928ael_MortgageLoansOnRealEstateInWorkout 0ael_MortgageLoansOnRealEstateInWorkout
Delinquent 2,316us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans 0us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
Collateral dependent 4,844ael_MortgageLoansOnRealEstateCollateralDependent 5,961ael_MortgageLoansOnRealEstateCollateralDependent
Principal outstanding $ 2,453,692us-gaap_LoansReceivableCommercialRealEstate $ 2,457,721us-gaap_LoansReceivableCommercialRealEstate