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Borrowings - Interest Expense on Broker-Dealer Facilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]      
Interest expense $ 87,735 $ 121,859 $ 71,800
Broker-dealer credit facilities      
Line of Credit Facility [Line Items]      
Interest expense 1,995 2,045 2,100
Uncommitted facility      
Line of Credit Facility [Line Items]      
Interest expense 1,337 1,591 1,794
Committed facility      
Line of Credit Facility [Line Items]      
Interest expense 447 454 306
Demand Loan      
Line of Credit Facility [Line Items]      
Interest expense $ 211 $ 0 $ 0