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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mortgage Loans on Real Estate [Abstract]    
Principal outstanding $ 2,453,692us-gaap_LoansReceivableCommercialRealEstate $ 2,457,721us-gaap_LoansReceivableCommercialRealEstate
Loan loss allowance (19,452)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate (22,633)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
Deferred prepayment fees (483)us-gaap_LoansAndLeasesReceivableDeferredIncomeCommercial (508)us-gaap_LoansAndLeasesReceivableDeferredIncomeCommercial
Mortgage loans on real estate $ 2,433,757us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet $ 2,434,580us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet