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Interest Expense - Schedule of Components of Interest Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt securities:      
Interest expense $ 143,968 $ 109,367 $ 114,129
Amortization of debt discount and issuance costs 7,792 6,992 4,512
Other Secured Borrowings      
Debt securities:      
Interest expense 31,656 0 0
Amortization of debt discount and issuance costs 5,000    
Senior Notes      
Debt securities:      
Interest expense 31,914 26,634 31,804
Mortgage Loan Warehouse Facilities      
Debt securities:      
Interest expense 30,638 15,239 11,100
MSR Financing Facilities      
Debt securities:      
Interest expense 26,036 15,885 8,112
Match Funded Liabilities      
Debt securities:      
Interest expense 14,238 24,122 26,902
SSTL      
Debt securities:      
Interest expense 2,956 20,465 27,066
Other      
Debt securities:      
Interest expense $ 6,530 $ 7,022 $ 9,145