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Advances - Schedule of Advances Paid on Behalf of Borrowers or on Foreclosed Properties (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Advances On Behalf of Borrowers [Line Items]            
Advances, gross $ 190,272   $ 228,258      
Allowance for losses (16,485) $ (16,980) (16,465) $ (20,328) $ (35,844) $ (37,952)
Advances, net 173,787   211,793      
Principal and Interest [Member]            
Advances On Behalf of Borrowers [Line Items]            
Advances, gross 14,598   20,207      
Taxes and Insurance [Member]            
Advances On Behalf of Borrowers [Line Items]            
Advances, gross 113,946   144,454      
Foreclosures, Bankruptcy and Other [Member]            
Advances On Behalf of Borrowers [Line Items]            
Advances, gross $ 61,728   $ 63,597