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Rights to MSRs - Narrative (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 18, 2018
Sep. 01, 2017
Jul. 23, 2017
Apr. 30, 2015
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2017
Servicing Assets at Fair Value [Line Items]                
Proceeds from sale of mortgage servicing rights accounted for as financing           $ 279,586 $ 54,601  
NRZ [Member]                
Servicing Assets at Fair Value [Line Items]                
UPB of MSRs for which servicing rights has been sold               $ 109,600,000
Initial term to subservice mortgage servicing rights     5 years          
Transfers upon receipt of consents, MSRs   $ 15,900,000            
Proceeds from sale of mortgage servicing rights accounted for as financing $ 279,600 $ 54,600            
Term of extended subservicing agreement following initial term           3 months    
Percentage on UPB of performing loans received as consideration on sale of clean up call rights       0.50%        
Proceeds from execution of clean-up calls         $ 800   $ 5,500