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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mortgage Loans on Real Estate [Abstract]    
Principal outstanding $ 2,483,782 $ 2,449,909
Loan loss allowance (11,750) (14,142)
Deferred prepayment fees (597) (510)
Mortgage loans on real estate $ 2,471,435 $ 2,435,257