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Collateralized Transactions (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Securities received as collateral:    
Securities borrowed $ 1,201,721 $ 1,415,793
Total amounts related to collateralized transactions 1,201,721 1,415,793
Financial instruments owned and pledged    
Financial instruments owned and pledged 610,536 595,043
Equities    
Financial instruments owned and pledged    
Financial instruments owned and pledged 571,997 586,251
U.S. and Non-U.S. government obligations    
Financial instruments owned and pledged    
Financial instruments owned and pledged 200 99
Exchange traded notes    
Financial instruments owned and pledged    
Financial instruments owned and pledged $ 38,339 $ 8,693