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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, 2019
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]      
Balance at January 1 $ 730,515 $ 752,129 $ 915,905
Additions:      
New mortgage loans 11,667 381,133 265,966
Additions under existing mortgage loans 164,120 157,702 132,703
Other 25,740 25,778 23,388
Deductions:      
Collections of principal (355,769) (501,466) (528,321)
Recovery of (provision for) loan losses (493) (45) 28
Transfers to real estate and equity investments (13,987) (84,684) (57,505)
Amortization of premium (32) (32) (35)
Balance at December 31 561,761 $ 730,515 752,129
Charge offs $ 19,200   $ 1,200