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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Mortgage Loans on Real Estate [Abstract]    
Principal outstanding $ 2,801,880 $ 2,674,315
Loan loss allowance (6,326) (7,518)
Deferred prepayment fees (1,172) (1,266)
Mortgage loans on real estate $ 2,794,382 $ 2,665,531