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Advances - Schedule of Advances Paid on Behalf of Borrowers or on Foreclosed Properties (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Advances On Behalf of Borrowers [Line Items]            
Advances, gross $ 232,115   $ 295,834      
Allowance for losses (34,162) $ (20,328) (37,952) $ (46,912) $ (39,441) $ (41,901)
Advances, net 197,953   257,882      
Principal and Interest [Member]            
Advances On Behalf of Borrowers [Line Items]            
Advances, gross 16,951   31,334      
Taxes and Insurance [Member]            
Advances On Behalf of Borrowers [Line Items]            
Advances, gross 137,992   170,131      
Foreclosures, Bankruptcy and Other [Member]            
Advances On Behalf of Borrowers [Line Items]            
Advances, gross $ 77,172   $ 94,369