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Financial Assets and Liabilities - Netting of Certain Financial Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Securities borrowed    
Gross Amounts of Recognized Assets $ 1,525,403 $ 220,005
Net Amounts of Assets Presented in the Consolidated Statement of Financial Condition 1,525,403 220,005
Gross Amounts Not Offset in the Statement of Financial Condition    
Financial instruments (1,480,267) (216,778)
Cash collateral received (844) (248)
Net Amount 44,292 2,979
Securities purchased under agreements to resell    
Gross Amounts of Recognized Assets 8,249  
Net Amounts of Assets Presented in the Consolidated Statement of Financial Condition 8,249  
Gross Amounts Not Offset in the Statement of Financial Condition    
Financial instruments (8,188)  
Net Amount 61  
Total    
Gross Amounts of Recognized Assets 5,004,212 1,367,407
Gross Amounts Offset in the Consolidated Statement of Financial Condition (3,458,283) (1,140,239)
Net Amounts of Assets Presented in the Consolidated Statement of Financial Condition 1,545,929 227,168
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition    
Financial instruments (1,488,960) (216,858)
Cash collateral received (844) (261)
Net Amount 56,125 10,049
Currency forwards    
Trading assets, at fair value    
Gross Amounts of Recognized Assets 3,459,340 1,147,261
Gross Amounts Offset in the Consolidated Statement of Financial Condition (3,458,283) (1,140,239)
Net Amounts of Assets Presented in the Consolidated Statement of Financial Condition 1,057 7,022
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition    
Net Amount 1,057 7,022
Options    
Trading assets, at fair value    
Gross Amounts of Recognized Assets 11,220 141
Net Amounts of Assets Presented in the Consolidated Statement of Financial Condition 11,220 141
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition    
Financial instruments (505) (80)
Cash collateral received   (13)
Net Amount $ 10,715 $ 48