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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, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]      
Balance at January 1 $ 561,761 $ 730,515 $ 752,129
Additions:      
New mortgage loans 19,975 11,667 381,133
Additions under existing mortgage loans 72,574 164,120 157,702
Other 25,867 25,740 25,778
Deductions:      
Collections of principal (178,662) (355,769) (501,466)
Provision for loan losses (4,930) (493) (45)
Transfers to real estate and equity investments 0 (13,987) (84,684)
Amortization of premium (32) (32) (32)
Balance at December 31 496,553 561,761 $ 730,515
Charge offs $ 25,900 $ 19,200