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Borrowings - Interest Expense on Broker-Dealer Facilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Line of Credit Facility [Line Items]    
Interest expense $ 22,788 $ 19,047
Broker-dealer credit facilities    
Line of Credit Facility [Line Items]    
Interest expense 257 544
Uncommitted facility    
Line of Credit Facility [Line Items]    
Interest expense 184 446
Committed facility    
Line of Credit Facility [Line Items]    
Interest expense $ 73 $ 98