Annual report pursuant to Section 13 and 15(d)

DEBT OBLIGATIONS - Schedule of Debt Obligations (Details)

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DEBT OBLIGATIONS - Schedule of Debt Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Outstanding Face Amount $ 35,650,844    
Carrying Value $ 35,636,373 $ 22,656,235 $ 15,746,530
Weighted Average Funding Cost 2.71%    
Weighted Average Life (Years) 24 days    
Interest payable $ 68,668 49,352  
Excess MSRs      
Debt Instrument [Line Items]      
Carrying Value 217,300 297,563 483,978
Servicer Advances      
Debt Instrument [Line Items]      
Carrying Value 3,181,672 3,382,455 4,060,156
Consumer Loans      
Debt Instrument [Line Items]      
Carrying Value 816,689 936,447 $ 1,242,756
Repurchase Agreements: | Agency RMBS      
Debt Instrument [Line Items]      
Outstanding Face Amount 15,481,677    
Carrying Value $ 15,481,677 4,346,070  
Weighted Average Funding Cost 1.99%    
Weighted Average Life (Years) 2 hours    
Repurchase Agreements: | Agency RMBS | Trade And Other Receivables      
Debt Instrument [Line Items]      
Collateral amount $ 5,300,000    
Repurchase Agreements: | Agency RMBS | Collateral      
Debt Instrument [Line Items]      
Weighted Average Life (Years) 4 years    
Outstanding Face $ 15,499,156    
Amortized Cost Basis 15,810,728    
Carrying Value 15,862,218    
Repurchase Agreements: | Non-Agency RMBS      
Debt Instrument [Line Items]      
Outstanding Face Amount 7,317,519    
Carrying Value $ 7,317,519 7,434,785  
Weighted Average Funding Cost 2.76%    
Weighted Average Life (Years) 3 days    
Repurchase Agreements: | Non-Agency RMBS | Retained Servicer Advance and Consumer Bonds      
Debt Instrument [Line Items]      
Carrying Value $ 7,500    
Repurchase Agreements: | Non-Agency RMBS | Retainer Bonds Collateralized By Agency MSRs      
Debt Instrument [Line Items]      
Carrying Value $ 638,600    
Repurchase Agreements: | Non-Agency RMBS | Collateral      
Debt Instrument [Line Items]      
Weighted Average Life (Years) 7 years    
Outstanding Face $ 25,220,620    
Amortized Cost Basis 8,014,409    
Carrying Value 8,661,349    
Repurchase Agreements: | Non-Agency RMBS | Collateral | Retained Servicer Advance and Consumer Bonds      
Debt Instrument [Line Items]      
Carrying Value 10,000    
Repurchase Agreements: | Non-Agency RMBS | Collateral | Retainer Bonds Collateralized By Agency MSRs      
Debt Instrument [Line Items]      
Carrying Value 744,400    
Repurchase Agreements: | Residential Mortgage Loans      
Debt Instrument [Line Items]      
Outstanding Face Amount 5,054,667    
Carrying Value $ 5,053,207 3,678,246  
Weighted Average Funding Cost 3.48%    
Weighted Average Life (Years) 18 days    
Repurchase Agreements: | Residential Mortgage Loans | Collateral      
Debt Instrument [Line Items]      
Weighted Average Life (Years) 15 years 4 months 24 days    
Outstanding Face $ 5,778,009    
Amortized Cost Basis 5,847,650    
Carrying Value 5,577,297    
Repurchase Agreements: | Real Estate Owned      
Debt Instrument [Line Items]      
Outstanding Face Amount 63,846    
Carrying Value $ 63,822 94,868  
Weighted Average Funding Cost 3.53%    
Weighted Average Life (Years) 21 days    
Repurchase Agreements: | Real Estate Owned | Collateral      
Debt Instrument [Line Items]      
Carrying Value $ 77,556    
Repurchase Agreements: | Repurchase Agreements      
Debt Instrument [Line Items]      
Outstanding Face Amount 27,917,709    
Carrying Value $ 27,916,225 15,553,969  
Weighted Average Funding Cost 2.47%    
Weighted Average Life (Years) 6 days    
Interest payable $ 84,100    
Repurchase Agreements: | Non-agency RMBS Repurchase Agreements, LIBOR Based Floating Interest Rate      
Debt Instrument [Line Items]      
Outstanding Face Amount 6,788,400    
Repurchase Agreements: | Non-agency RMBS Repurchase Agreements, Fixed Rate      
Debt Instrument [Line Items]      
Outstanding Face Amount 529,100    
Notes and Bonds Payable: | Residential Mortgage Loans      
Debt Instrument [Line Items]      
Outstanding Face Amount 866,001    
Carrying Value $ 864,451 124,945  
Weighted Average Funding Cost 4.63%    
Weighted Average Life (Years) 8 years 3 months 18 days    
Notes and Bonds Payable: | Residential Mortgage Loans | Collateral      
Debt Instrument [Line Items]      
Weighted Average Life (Years) 7 years 1 month 6 days    
Outstanding Face $ 1,183,625    
Amortized Cost Basis 1,199,326    
Carrying Value 1,171,201    
Notes and Bonds Payable: | Excess MSRs      
Debt Instrument [Line Items]      
Outstanding Face Amount 217,300    
Carrying Value $ 217,300 297,563  
Weighted Average Funding Cost 4.45%    
Weighted Average Life (Years) 2 years 7 months 6 days    
Notes and Bonds Payable: | Excess MSRs | Collateral      
Debt Instrument [Line Items]      
Weighted Average Life (Years) 5 years 10 months 24 days    
Outstanding Face $ 97,846,949    
Amortized Cost Basis 306,803    
Carrying Value 394,644    
Notes and Bonds Payable: | MSRs      
Debt Instrument [Line Items]      
Outstanding Face Amount 2,646,540    
Carrying Value $ 2,640,036 2,360,856  
Weighted Average Funding Cost 4.16%    
Weighted Average Life (Years) 1 year 7 months 6 days    
Notes and Bonds Payable: | MSRs | Collateral      
Debt Instrument [Line Items]      
Weighted Average Life (Years) 5 years 8 months 12 days    
Outstanding Face $ 394,098,370    
Amortized Cost Basis 3,998,060    
Carrying Value 4,446,855    
Notes and Bonds Payable: | Servicer Advances      
Debt Instrument [Line Items]      
Outstanding Face Amount 3,189,486    
Carrying Value $ 3,181,672 3,382,455  
Weighted Average Funding Cost 2.90%    
Weighted Average Life (Years) 2 years 1 month 6 days    
Face amount of fixed rate debt $ 1,900,000    
Notes and Bonds Payable: | Servicer Advances | LIBOR | Minimum      
Debt Instrument [Line Items]      
Variable interest rate spread 1.00%    
Notes and Bonds Payable: | Servicer Advances | LIBOR | Maximum      
Debt Instrument [Line Items]      
Variable interest rate spread 2.00%    
Notes and Bonds Payable: | Servicer Advances | Collateral      
Debt Instrument [Line Items]      
Weighted Average Life (Years) 1 year 4 months 24 days    
Outstanding Face $ 3,587,593    
Amortized Cost Basis 3,858,818    
Carrying Value 3,883,151    
Notes and Bonds Payable: | Consumer Loans      
Debt Instrument [Line Items]      
Outstanding Face Amount 813,808    
Carrying Value $ 816,689 936,447  
Weighted Average Funding Cost 3.25%    
Weighted Average Life (Years) 3 years 10 months 24 days    
Notes and Bonds Payable: | Consumer Loans | Collateral      
Debt Instrument [Line Items]      
Weighted Average Life (Years) 3 years 10 months 24 days    
Outstanding Face $ 823,806    
Amortized Cost Basis 830,900    
Carrying Value 827,434    
Notes and Bonds Payable: | Total Notes and Bonds Payable      
Debt Instrument [Line Items]      
Outstanding Face Amount 7,733,135    
Carrying Value $ 7,720,148 $ 7,102,266  
Weighted Average Funding Cost 3.60%    
Weighted Average Life (Years) 2 years 9 months 18 days    
Notes and Bonds Payable: | Residential Mortgage Loans | Mr. Cooper      
Debt Instrument [Line Items]      
Outstanding Face Amount $ 5,600    
Collateral amount $ 2,100    
Variable interest rate spread 4.59%    
Notes and Bonds Payable: | Residential Mortgage Loans | LIBOR | Mr. Cooper      
Debt Instrument [Line Items]      
Variable interest rate spread 2.88%    
Notes and Bonds Payable: | Residential Mortgage Backed Securities      
Debt Instrument [Line Items]      
Outstanding Face Amount $ 105,300    
Notes and Bonds Payable: | Residential Mortgage Backed Securities | Minimum      
Debt Instrument [Line Items]      
Weighted Average Funding Cost 3.50%    
Notes and Bonds Payable: | Residential Mortgage Backed Securities | Maximum      
Debt Instrument [Line Items]      
Weighted Average Funding Cost 3.76%    
Secured Debt | 3.00% Secured Corporate Note      
Debt Instrument [Line Items]      
Outstanding Face Amount $ 217,300    
Secured Debt | 3.00% Secured Corporate Note | LIBOR      
Debt Instrument [Line Items]      
Variable interest rate spread 2.75%    
Secured Debt | 2.25% Agency MSR Secured Note      
Debt Instrument [Line Items]      
Outstanding Face Amount $ 1,250,000    
Secured Debt | 2.25% Agency MSR Secured Note | LIBOR | Minimum      
Debt Instrument [Line Items]      
Variable interest rate spread 2.25%    
Secured Debt | 2.25% Agency MSR Secured Note | LIBOR | Maximum      
Debt Instrument [Line Items]      
Variable interest rate spread 2.75%    
Secured Debt | 2.50% Agency MSR Secured Note      
Debt Instrument [Line Items]      
Outstanding Face Amount $ 59,500    
Secured Debt | 2.50% Agency MSR Secured Note | LIBOR      
Debt Instrument [Line Items]      
Variable interest rate spread 2.50%    
Secured Debt | 3.55% Agency MSR Secured Note      
Debt Instrument [Line Items]      
Outstanding Face Amount $ 1,337,100    
Secured Debt | 3.55% Agency MSR Secured Note | LIBOR | Minimum      
Debt Instrument [Line Items]      
Variable interest rate spread 3.55%    
Secured Debt | 3.55% Agency MSR Secured Note | LIBOR | Maximum      
Debt Instrument [Line Items]      
Variable interest rate spread 4.62%    
Secured Debt | 4.59% Asset-backed Notes      
Debt Instrument [Line Items]      
Outstanding Face Amount $ 353,500    
Collateral amount 300    
Secured Debt | 6.58% Asset-backed Notes      
Debt Instrument [Line Items]      
Outstanding Face Amount $ 202,500    
Weighted Average Funding Cost 6.58%    
Secured Debt | Asset-Backed Notes, LIBOR Based Floating Interest Rate      
Debt Instrument [Line Items]      
Outstanding Face Amount $ 199,100    
Collateral amount $ 1,500    
Secured Debt | Asset-Backed Notes, LIBOR Based Floating Interest Rate | LIBOR      
Debt Instrument [Line Items]      
Variable interest rate spread 1.25%    
Secured Debt | Consumer Loan, UPB Class A      
Debt Instrument [Line Items]      
UPB of Underlying Mortgages $ 734,700    
Interest rate, stated percentage 3.20%    
Secured Debt | Consumer Loan, UPB Class B      
Debt Instrument [Line Items]      
UPB of Underlying Mortgages $ 70,400    
Interest rate, stated percentage 3.58%    
Secured Debt | Consumer Loan, UPB Class C-1      
Debt Instrument [Line Items]      
UPB of Underlying Mortgages $ 8,700    
Interest rate, stated percentage 5.06%