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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mortgage Loans on Real Estate [Abstract]      
Principal outstanding $ 2,457,721us-gaap_LoansReceivableCommercialRealEstate $ 2,607,698us-gaap_LoansReceivableCommercialRealEstate $ 2,658,883us-gaap_LoansReceivableCommercialRealEstate
Loan loss allowance (22,633)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate (26,047)us-gaap_AllowanceForLoanAndLeaseLossesRealEstate  
Deferred prepayment fees (508)us-gaap_LoansAndLeasesReceivableDeferredIncomeCommercial (569)us-gaap_LoansAndLeasesReceivableDeferredIncomeCommercial  
Mortgage loans on real estate $ 2,434,580us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet $ 2,581,082us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet