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Other Debt - Summary of Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Debt Instrument [Line Items]        
Interest expense — portfolio related $ 20,321 $ 22,347 $ 61,720 $ 66,384
Interest expense — corporate debt 4,488 1,913 16,147 10,149
Total interest expense 24,809 24,260 77,867 76,533
Warehouse and Repurchase Facilities        
Debt Instrument [Line Items]        
Interest expense — portfolio related 2,365 703 6,433 7,635
Securitizations        
Debt Instrument [Line Items]        
Interest expense — portfolio related $ 17,956 $ 21,644 $ 55,287 $ 58,749