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Rights to MSRs - Financing Liability Rollforward (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Servicing Liability at Fair Value, Amount [Roll Forward]      
Beginning balance $ 950,593 $ 1,032,856 $ 508,291
Additions   1,276 667
Sales (226) 44  
Receipt of lump-sum cash payments     279,586
Derecognition of Pledged MSR financing liability due to termination of PMC MSR Agreements (263,664) 0 0
Ending balance 566,952 950,593 1,032,856
Original Rights to MSRs Agreements      
Servicing Liability at Fair Value, Amount [Roll Forward]      
Beginning balance 603,046 436,511 499,042
Changes in fair value: 21,964 229,198 (171)
Runoff and settlement: (56,302) (48,730) (58,837)
Calls (1,756) (13,933) (3,523)
Ending balance 566,952 603,046 436,511
2017 Agreements and New RMSR Agreements      
Servicing Liability at Fair Value, Amount [Roll Forward]      
Beginning balance 35,445 138,854 9,249
Changes in fair value: 903 5,866 (14,369)
Runoff and settlement: (35,121) (101,003) (134,509)
Calls (1,227) (8,272) (1,103)
Ending balance 0 35,445 138,854
PMC MSR Agreements      
Servicing Liability at Fair Value, Amount [Roll Forward]      
Beginning balance 312,102 457,491 0
Additions   1,276  
Sales (226) 44  
Changes in fair value: (40,720) (82,078) (4,729)
Runoff and settlement: (7,492) (64,631) (18,420)
Calls   0 (1,047)
Ending balance $ 0 $ 312,102 457,491
PHH Corporation      
Servicing Liability at Fair Value, Amount [Roll Forward]      
Additions     $ 481,020