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Advances - Schedule of Advances Paid on Behalf of Borrowers or on Foreclosed Properties (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Advances On Behalf of Borrowers [Line Items]        
Advances, gross $ 1,032,180 $ 1,066,448    
Allowance for losses (7,373) (9,925) $ (23,135) $ (23,259)
Advances, net 1,024,807 1,056,523    
Principal and Interest        
Advances On Behalf of Borrowers [Line Items]        
Advances, gross 426,308 414,846    
Taxes and Insurance        
Advances On Behalf of Borrowers [Line Items]        
Advances, gross 383,829 422,383    
Foreclosures, Bankruptcy and Other        
Advances On Behalf of Borrowers [Line Items]        
Advances, gross $ 222,043 $ 229,219