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Interest Expense - Schedule of Components of Interest Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt securities:      
Interest expense $ 109,367 $ 114,129 $ 103,371
Senior Notes      
Debt securities:      
Interest expense 26,634 31,804 31,280
Match Funded Liabilities      
Debt securities:      
Interest expense 24,122 26,902 31,870
Other Secured Borrowings      
Debt securities:      
Interest expense 51,589 46,278 35,412
Other      
Debt securities:      
Interest expense $ 7,022 $ 9,145 $ 4,809