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Schedule IV - Mortgage Loans on Real Estate (Changes in Mortgage Loans) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Abstract]      
Balance, beginning of period $ 7,868 $ 9,314 $ 18,790
Advances under real estate loans 0 0 0
Deductions (1,445) (1,446) (9,476)
Balance, end of period $ 6,423 $ 7,868 $ 9,314