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Short-Term Debt - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2022
Aug. 31, 2022
Jul. 01, 2022
Dec. 31, 2021
Short-term Debt [Line Items]          
Average balance of short-term debt $ 1,640,000,000 $ 1,650,000,000      
Accrued interest payable on short-term debt 5,000,000 5,000,000     $ 2,000,000
Committed line of credit 10,000,000 10,000,000      
Fair market value of committed line of credit 1,000,000 1,000,000      
Amount outstanding under credit facilities 0 0     0
Borrowings 1,546,934,000 1,546,934,000     1,650,576,000
Debt instrument, unamortized deferred issuance costs 12,708,000 12,708,000     9,743,000
Convertible notes          
Short-term Debt [Line Items]          
Debt instrument, unamortized deferred issuance costs     $ 1,000,000    
4.75% convertible senior notes | Convertible notes          
Short-term Debt [Line Items]          
Borrowings $ 199,000,000 $ 199,000,000     $ 198,629,000
Debt Instrument interest rate (as a percent) 4.75% 4.75%     4.75%
Debt instrument, unamortized deferred issuance costs         $ 1,836,000
Convertible notes          
Short-term Debt [Line Items]          
Debt instrument, unamortized deferred issuance costs $ 1,000,000 $ 1,000,000      
Riverbend Funding, LLC          
Short-term Debt [Line Items]          
Promissory notes       $ 43,000,000  
Debt instrument, periodic payment, principal 12,000,000        
Riverbend Funding, LLC | Minimum          
Short-term Debt [Line Items]          
Fixed interest rate (as a percentage)       6.00%  
Riverbend Funding, LLC | Maximum          
Short-term Debt [Line Items]          
Fixed interest rate (as a percentage)       8.00%  
Servicer advance financing          
Short-term Debt [Line Items]          
Accrued interest payable on short-term debt 300,000 300,000      
Unamortized capitalized commitment costs 100,000 100,000      
Business Purpose Loan Warehouse Facilities          
Short-term Debt [Line Items]          
increase in short term debt from reclassification $ 450,000,000 $ 900,000,000