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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Receivables [Abstract]    
Principal outstanding $ 3,059,265 $ 2,952,464
Loan loss allowance (8,179) (8,239)
Deferred prepayment fees (1,088) (1,134)
Mortgage loans on real estate $ 3,049,998 $ 2,943,091