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Advances - Schedule of Advances Paid on Behalf of Borrowers or on Foreclosed Properties (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Advances On Behalf of Borrowers [Line Items]            
Advances, gross $ 181,777   $ 228,258      
Allowance for losses (15,753) $ (16,485) (16,465) $ (34,162) $ (20,328) $ (37,952)
Advances, net 166,024   211,793      
Principal and Interest [Member]            
Advances On Behalf of Borrowers [Line Items]            
Advances, gross 16,385   20,207      
Taxes and Insurance [Member]            
Advances On Behalf of Borrowers [Line Items]            
Advances, gross 105,633   144,454      
Foreclosures, Bankruptcy and Other [Member]            
Advances On Behalf of Borrowers [Line Items]            
Advances, gross $ 59,759   $ 63,597