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Other Debt - Summary of Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Debt Instrument [Line Items]        
Interest expense — portfolio related $ 20,566 $ 21,189 $ 41,399 $ 44,036
Interest expense — corporate debt 4,309 1,894 11,658 8,237
Total interest expense 24,875 23,083 53,057 52,273
Warehouse and Repurchase Facilities        
Debt Instrument [Line Items]        
Interest expense — portfolio related 2,361 2,632 4,067 6,932
Securitizations        
Debt Instrument [Line Items]        
Interest expense — portfolio related $ 18,205 $ 18,557 $ 37,332 $ 37,104