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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Mortgage Loans on Real Estate [Abstract]    
Principal outstanding $ 2,620,756 $ 2,490,619
Loan loss allowance (8,149) (8,427)
Deferred prepayment fees (1,181) (1,236)
Mortgage loans on real estate $ 2,611,426 $ 2,480,956