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Financial Assets and Liabilities - Netting of Certain Financial Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Securities borrowed |  |
Gross Amounts of Recognized Assets | $ 358,463 | $ 220,005
Net Amounts of Assets Presented in the Consolidated Statement of Financial Condition | 358,463 | 220,005
Gross Amounts Not Offset in the Statement of Financial Condition |  |
Financial instruments | (350,923) | (216,778)
Cash collateral received | (1,272) | (248)
Net Amount | 6,268 | 2,979
Total |  |
Gross Amounts of Recognized Assets | 2,114,908 | 1,367,407
Gross Amounts Offset in the Consolidated Statement of Financial Condition | (1,755,123) | (1,140,239)
Net Amounts of Assets Presented in the Consolidated Statement of Financial Condition | 359,785 | 227,168
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition |  |
Financial instruments | (351,137) | (216,858)
Cash collateral received | (1,274) | (261)
Net Amount | 7,374 | 10,049
Currency forwards |  |
Trading assets, at fair value |  |
Gross Amounts of Recognized Assets | 1,756,179 | 1,147,261
Gross Amounts Offset in the Consolidated Statement of Financial Condition | (1,755,123) | (1,140,239)
Net Amounts of Assets Presented in the Consolidated Statement of Financial Condition | 1,056 | 7,022
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition |  |
Net Amount | 1,056 | 7,022
Options |  |
Trading assets, at fair value |  |
Gross Amounts of Recognized Assets | 266 | 141
Net Amounts of Assets Presented in the Consolidated Statement of Financial Condition | 266 | 141
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition |  |
Financial instruments | (214) | (80)
Cash collateral received | (2) | (13)
Net Amount | $ 50 | $ 48

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