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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Receivables [Abstract]      
Principal outstanding $ 2,952,464 $ 2,674,315 $ 2,490,619
Loan loss allowance (8,239) (7,518)  
Deferred prepayment fees (1,134) (1,266)  
Mortgage loans on real estate $ 2,943,091 $ 2,665,531