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Advances - Schedule of Advances Paid on Behalf of Borrowers or on Foreclosed Properties (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Advances On Behalf of Borrowers [Line Items]            
Advances, gross $ 221,981   $ 272,641      
Allowance for losses (9,297) $ (27,653) (23,259) $ (15,753) $ (16,485) $ (16,465)
Advances, net 212,684   249,382      
Principal and Interest [Member]            
Advances On Behalf of Borrowers [Line Items]            
Advances, gross 44,839   43,671      
Taxes and Insurance [Member]            
Advances On Behalf of Borrowers [Line Items]            
Advances, gross 134,361   160,373      
Foreclosures, Bankruptcy and Other [Member]            
Advances On Behalf of Borrowers [Line Items]            
Advances, gross $ 42,781   $ 68,597