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SCHEDULE IV Mortgage Loans Receivable (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Abstract]      
Begining, balance $ 14,030 $ 14,030 $ 23,659
Increase of interest receivable on mortgage loans, additions 0 0 (549)
Amounts received, deductions     (9,080)
Ending, balance $ 13,126 $ 14,030 $ 14,030