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Rights to MSRs - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Oct. 04, 2018
USD ($)
Jan. 31, 2018
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
loan
Jun. 30, 2018
USD ($)
Servicing Assets at Fair Value [Line Items]              
Proceeds from sale of mortgage servicing rights accounted for as financing   $ 279,600 $ 54,600     $ 876 $ 279,586
Servicing fee revenues       $ 141,091 $ 126,712 296,938 $ 253,729
Unpaid principal balance on servicing assets acquired $ 42,300,000     10,800,000   10,800,000  
Unpaid principal balance on servicing assets and advances committed to sale       3,000,000   3,000,000  
Percentage of mortgage loans servicing that can be terminated 25.00%            
NRZ [Member]              
Servicing Assets at Fair Value [Line Items]              
UPB of rights to MSRs sold       19,800,000   $ 19,800,000  
PHH Corporation [Member]              
Servicing Assets at Fair Value [Line Items]              
Number of Loans Serviced under Subservicing Arrangement | loan           300,149  
Servicing fee revenues       $ 7,000   $ 14,200