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Advances - Schedule of Advances Paid on Behalf of Borrowers or on Foreclosed Properties (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Advances On Behalf of Borrowers [Line Items]            
Advances, gross $ 256,820   $ 272,641      
Allowance for losses (27,653) $ (23,135) (23,259) $ (16,485) $ (16,980) $ (16,465)
Advances, net 229,167   249,382      
Principal and Interest [Member]            
Advances On Behalf of Borrowers [Line Items]            
Advances, gross 65,389   43,671      
Taxes and Insurance [Member]            
Advances On Behalf of Borrowers [Line Items]            
Advances, gross 152,394   160,373      
Foreclosures, Bankruptcy and Other [Member]            
Advances On Behalf of Borrowers [Line Items]            
Advances, gross $ 39,037   $ 68,597