XML 26 R42.htm IDEA: XBRL DOCUMENT v3.19.3
Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Receivables [Abstract]    
Principal outstanding $ 3,221,152 $ 2,952,464
Loan loss allowance (8,079) (8,239)
Deferred prepayment fees (998) (1,134)
Mortgage loans on real estate $ 3,212,075 $ 2,943,091