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Collateralized Transactions (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Securities received as collateral:    
Securities borrowed $ 1,246,913 $ 1,361,635
Securities purchased under agreements to resell 5,650 15,475
Securities received as collateral 1,252,563 1,377,110
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Financial instruments owned and pledged 740,630 791,115
Equities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Financial instruments owned and pledged 697,090 748,846
Exchange traded notes    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Financial instruments owned and pledged $ 43,540 $ 42,269