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Schedule IV - Mortgage Loan on Real Estate - Mortgage Loan Rollforward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]      
Mortgage loans, beginning of period $ 15,000 $ 29,500 $ 12,375
Additions during period:      
New mortgage loans 0 61,258 40,889
Interest income added to principal 155 0 0
Deductions during period:      
Paydowns/Repayments 0 (75,758) (23,764)
Mortgage loans, end of period $ 15,155 $ 15,000 $ 29,500