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Rights to MSRs - Narrative (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Jan. 18, 2018
Sep. 01, 2017
Jan. 31, 2018
Apr. 30, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Servicing Assets at Fair Value [Line Items]              
Proceeds from sale of mortgage servicing rights accounted for as financing         $ 54,601 $ 0 $ 0
Threshold percentage to initiate clean-up call rights       0.50% 0.50%    
NRZ [Member]              
Servicing Assets at Fair Value [Line Items]              
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         $ 54,600    
Term of extended subservicing agreement following initial term         3 months    
Compensatory fee payable           10,500 14,300
Proceeds from execution of clean-up calls         $ 5,900 $ 3,100 $ 2,600
NRZ [Member] | Subsequent Event [Member]              
Servicing Assets at Fair Value [Line Items]              
Proceeds from sale of mortgage servicing rights accounted for as financing $ 279,600   $ 279,600