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Advances - Schedule of Advances Paid on Behalf of Borrowers or on Foreclosed Properties (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Advances On Behalf of Borrowers [Line Items]        
Advances, gross $ 214,100 $ 228,258    
Allowance for losses (16,980) (16,465) $ (35,844) $ (37,952)
Advances, net 197,120 211,793    
Principal and Interest [Member]        
Advances On Behalf of Borrowers [Line Items]        
Advances, gross 21,344 20,207    
Taxes and Insurance [Member]        
Advances On Behalf of Borrowers [Line Items]        
Advances, gross 128,441 144,454    
Foreclosures, Bankruptcy and Other [Member]        
Advances On Behalf of Borrowers [Line Items]        
Advances, gross $ 64,315 $ 63,597