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Financial Assets and Liabilities - Netting of Certain Financial Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Securities borrowed |  |
Gross Amounts of Recognized Assets | $ 1,232,048 | $ 1,471,172
Net Amounts of Assets Presented in the Consolidated Statement of Financial Condition | 1,232,048 | 1,471,172
Gross Amounts Not Offset in the Statement of Financial Condition |  |
Financial instruments | (1,202,760) | (1,418,672)
Cash collateral received | (2,624) | (13,318)
Net Amount | 26,664 | 39,182
Securities purchased under agreements to resell |  |
Gross Amounts of Recognized Assets | 602 |
Net Amounts of Assets Presented in the Condensed Consolidated Statement of Financial Condition | 602 | 0
Gross Amounts Not Offset In the Statement of Financial Condition |  |
Financial Instruments | (602) |
Cash Collateral Received | 0 |
Net Amount | 0 |
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition |  |
Securities Loaned, Collateral, Right to Reclaim Cash | 884 | 10,776
Total |  |
Gross Amounts of Recognized Assets | 1,944,749 | 3,523,704
Gross Amounts Offset in the Consolidated Statement of Financial Condition | (700,655) | (2,027,697)
Net Amounts of Assets Presented in the Consolidated Statement of Financial Condition | 1,244,094 | 1,496,007
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition |  |
Financial instruments | (1,203,363) | (1,418,717)
Cash collateral received | (2,624) | (13,318)
Net Amount | 38,107 | 63,972
Currency forwards |  |
Trading assets, at fair value |  |
Gross Amounts of Recognized Assets | 702,889 | 2,045,487
Gross Amounts Offset in the Consolidated Statement of Financial Condition | (700,655) | (2,027,697)
Net Amounts of Assets Presented in the Consolidated Statement of Financial Condition | 2,234 | 17,790
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition |  |
Financial instruments | 0 | 0
Cash collateral received | 0 | 0
Net Amount | 2,234 | 17,790
Options |  |
Trading assets, at fair value |  |
Gross Amounts of Recognized Assets | 9,210 | 7,045
Gross Amounts Offset in the Consolidated Statement of Financial Condition | 0 | 0
Net Amounts of Assets Presented in the Consolidated Statement of Financial Condition | 9,210 | 7,045
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition |  |
Financial instruments | (1) | (45)
Cash collateral received | 0 | 0
Net Amount | $ 9,209 | $ 7,000

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