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Fair Value - Summary of Reconciliation of the Changes in Fair Value of Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis (Footnote) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Jan. 18, 2018
Sep. 01, 2017
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Proceeds from sale of mortgage servicing rights accounted for as a financing       $ 279,586 $ 54,601 $ 0
Gain (loss) attributable to derivatives       (1,100) 100 300
Losses attributable to MSRs held       (153,500) (4,500) $ (78,300)
NRZ [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Proceeds from sale of mortgage servicing rights accounted for as a financing $ 279,600     279,600 $ 54,600  
Transfers upon receipt of consents, MSRs   $ 15,900,000        
Decrease in fair value of portion of Financing liability - MSRs pledged     $ 37,600 $ 16,600