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DEBT OBLIGATIONS - Narrative (Details)
$ in Thousands
12 Months Ended
Sep. 16, 2020
USD ($)
Dec. 31, 2021
USD ($)
agreement
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]        
Face amount of debt   $ 29,273,486    
Interest expense and warehouse line fees   497,308 $ 584,469 $ 933,751
Secured Financing Agreements        
Debt Instrument [Line Items]        
Face amount of debt   20,600,000    
Secured Financing Agreements        
Debt Instrument [Line Items]        
Face amount of debt   20,596,842    
Senior Notes        
Debt Instrument [Line Items]        
Issuance fees   6,700    
Interest expense and warehouse line fees   $ 34,400    
Senior Notes | 2025 Senior Notes        
Debt Instrument [Line Items]        
Face amount of debt $ 550,000      
Interest rate, stated percentage 6.25%      
Redemption maximum principal amount percentage 0.40      
Debt redemption percentage 106.25% 101.00%    
Borrowings under secured financing agreements $ 544,500      
Issuance fees $ 8,300      
Debt instrument, restrictive covenants, minimum total unencumbered assets maintenance requirement   1.20    
Stockholders' Equity | Counterpary Concentration Risk Exceeding 10% | Secured Financing Agreements        
Debt Instrument [Line Items]        
Number of outstanding repurchase agreements | agreement   0