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Regulatory Requirements - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended 48 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Loss Contingencies [Line Items]        
Third party monitoring costs related to regulatory matters and resolutions       $ 177,500
Number of days from fiscal year end that servicer is obliged to provide audited financial statements 90 days      
Capital requirement based on outstanding UPB of owned and subserviced portfolio $ 283,000     283,000
Aggregate cash payments in connection with legal and regulatory settlements [1] 174,941 $ 47,754 $ 4,928  
California Department of Business Oversight [Member]        
Loss Contingencies [Line Items]        
Litigation settlement expense 25,400      
Office of Mortgage Settlement Oversight [Member]        
Loss Contingencies [Line Items]        
Civil penalty $ 1,000     $ 1,000
[1] ncludes cash payments made in connection with resolved legal and regulatory matters.