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Schedule IV - Mortgage Loans on Real Estate (Changes in Mortgage Loans) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Mortgage Loans on Real Estate [Abstract]      
Balance, beginning of period $ 17,224 $ 13,161 $ 3,395
Advances under real estate loans 1,566 7,458 9,766
Deductions 0 3,395 0
Balance, end of period $ 18,790 $ 17,224 $ 13,161