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Schedule IV - Summary of Changes in Carrying Amounts of Mortgage Loans Receivable (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Mortgage Loans On Real Estate [Abstract]  
Balance, beginning of period $ 0
Additions  
New mortgage loans 14,854
Deductions  
Collections of principal 0
Balance, end of period $ 14,854