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Advances - Schedule of Advances Paid on Behalf of Borrowers or on Foreclosed Properties (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Advances On Behalf of Borrowers [Line Items]        
Advances, gross $ 270,017 $ 295,834    
Allowance for losses (35,844) (37,952) $ (42,523) $ (41,901)
Advances, net 234,173 257,882    
Principal and Interest [Member]        
Advances On Behalf of Borrowers [Line Items]        
Advances, gross 23,125 31,334    
Taxes and Insurance [Member]        
Advances On Behalf of Borrowers [Line Items]        
Advances, gross 154,690 170,131    
Foreclosures, Bankruptcy and Other [Member]        
Advances On Behalf of Borrowers [Line Items]        
Advances, gross $ 92,202 $ 94,369