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Schedule IV - Summary of Changes in Carrying Amounts of Mortgage Loans Receivable (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Mortgage Loans On Real Estate [Abstract]    
Balance, beginning of period $ 14,854  
Additions    
New mortgage loans 92,036 $ 14,854
Deductions    
Collections of principal (19,861)  
Balance, end of period $ 87,029 $ 14,854