XML 54 R43.htm IDEA: XBRL DOCUMENT v3.10.0.1
Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Mortgage Loans on Real Estate [Abstract]    
Principal outstanding $ 2,900,458 $ 2,674,315
Loan loss allowance (7,114) (7,518)
Deferred prepayment fees (1,189) (1,266)
Mortgage loans on real estate $ 2,892,155 $ 2,665,531