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DEBT OBLIGATIONS - MSR Facilities (Details) - USD ($)
$ in Thousands
Jan. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Jan. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]          
Servicing rights at fair value, amount   $ 1,999,763 $ 2,037,447    
Pledged as Collateral          
Debt Instrument [Line Items]          
Servicing rights at fair value, amount   617,878 $ 544,729    
Fifth Secured Credit Facility | Subsequent Event          
Debt Instrument [Line Items]          
Borrowing capacity $ 250,000        
Secured Debt [Member] | GMSR VFN | GNMA MSRs          
Debt Instrument [Line Items]          
Outstanding balance   175,000      
Deferred financing costs   300      
Secured Debt [Member] | GMSR VFN | Maximum | GNMA MSRs          
Debt Instrument [Line Items]          
Face amount   175,000      
Secured Debt [Member] | Third Secured Credit Facility          
Debt Instrument [Line Items]          
Borrowing capacity         $ 540,000
Option to increase borrowing capacity         $ 600,000
Deferred financing costs   2,500      
Secured Debt [Member] | Revolving credit facility          
Debt Instrument [Line Items]          
Outstanding balance   465,100      
Secured Debt [Member] | Revolving credit facility | Pledged as Collateral          
Debt Instrument [Line Items]          
Servicing rights at fair value, amount   716,800      
Secured Debt [Member] | Fourth Secured Credit Facility          
Debt Instrument [Line Items]          
Borrowing capacity       $ 500,000  
Servicing rights at fair value, amount   596,800      
Outstanding balance   $ 343,400