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Short-Term Debt - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2022
Jun. 30, 2020
Dec. 31, 2022
Dec. 31, 2021
Sep. 30, 2022
Aug. 31, 2022
Jul. 01, 2022
Aug. 31, 2017
Short-term Debt [Line Items]                
Average balance of short-term debt     $ 1,650,000,000 $ 1,670,000,000        
Accrued interest payable on short-term debt $ 7,000,000   7,000,000 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 1,746,145,000   1,746,145,000 1,650,576,000        
Debt instrument, unamortized deferred issuance costs 12,720,000   12,720,000 9,743,000        
Convertible notes                
Short-term Debt [Line Items]                
Debt instrument, unamortized deferred issuance costs 1,000,000   1,000,000          
Repurchased debt instrument, face amount 22,000,000   22,000,000          
Gain (loss) on extinguishment of debt 400,000              
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 $ 199,000,000      
Debt instrument, interest rate (as a percent) 4.75%   4.75% 4.75% 4.75%     4.75%
Debt instrument, unamortized deferred issuance costs       $ 1,836,000        
Repurchased debt instrument, face amount $ 10,000,000 $ 46,000,000 $ 10,000,000          
Gain (loss) on extinguishment of debt 2,000,000 $ 10,000,000            
Riverbend                
Short-term Debt [Line Items]                
Promissory notes             $ 43,000,000  
Debt instrument, periodic payment, principal     16,000,000          
Riverbend | Minimum                
Short-term Debt [Line Items]                
Fixed interest rate (as a percentage)             6.00%  
Riverbend | 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 500,000   500,000          
Unamortized capitalized commitment costs $ 1,000,000   1,000,000          
Business Purpose Loan Warehouse Facilities                
Short-term Debt [Line Items]                
increase in short term debt from reclassification     $ 900,000,000