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Business Acquisitions - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
State net operating loss carryforwards     $ 50,300  
State tax credits     9,200  
Mortgage servicing rights, at fair value $ 1,400,191 $ 1,074,247 1,457,149 $ 671,962
Bargain purchase gain (285) 0    
Revenue 303,888 260,257    
Servicing and subservicing fees 255,863 222,138    
MSR valuation adjustments, net 108,998 17,129    
Income tax expense 3,410 2,348    
PHH Corporation [Member]        
Business Acquisition [Line Items]        
Federal net operating loss carryforwards     30,200  
State net operating loss carryforwards     50,300  
State tax credits     9,200  
Bargain purchase gain $ 63,751      
Acquisition related costs   $ 3,700    
Useful life   3 years    
Fair Value Adjustments In Connection With Acquisition [Member] | PHH Corporation [Member]        
Business Acquisition [Line Items]        
Mortgage servicing rights, at fair value   $ 5,700    
Interest expense   2,300    
Financing Liability - MSRs Pledged [Member] | Fair Value Adjustments In Connection With Acquisition [Member] | PHH Corporation [Member]        
Business Acquisition [Line Items]        
Interest expense   2,600    
Mortgage Servicing Rights Sold Accounted For As Secured Borrowings [Member] | PHH Corporation [Member]        
Business Acquisition [Line Items]        
Revenue   33,900    
Servicing and subservicing fees   44,800    
MSR valuation adjustments, net   12,400    
Base Erosion And Anti-Abuse Tax [Member] | PHH Corporation [Member]        
Business Acquisition [Line Items]        
Income tax expense   $ 900    
UNITED STATES        
Business Acquisition [Line Items]        
Net operating loss carryforwards     58,200  
VIRGIN ISLANDS, US        
Business Acquisition [Line Items]        
Net operating loss carryforwards     $ 3,100