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Schedule IV - Mortgage Loans on Real Estate - Reconciliation of Mortgage Loans on Real Estate (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]      
Balance at January 1 $ 496,553 $ 561,761 $ 730,515
Additions:      
New mortgage loans 32,942 19,975 11,667
Additions under existing mortgage loans 20,958 72,574 164,120
Other 7,455 25,867 25,740
Deductions:      
Collections of principal (304,053) (178,662) (355,769)
Provision for loan losses 166 (4,930) (493)
Transfers to real estate and equity investments (42,501) 0 (13,987)
Amortization of premium (32) (32) (32)
Balance at December 31 $ 211,488 496,553 $ 561,761
Charge offs   $ 25,900