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Financial Assets and Liabilities - Netting of Certain Financial Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Securities loaned |  |
Gross Amounts of Recognized Liabilities | $ 423,672 | $ 222,203
Net Amounts of Liabilities Presented in the Consolidated Statement of Financial Condition | 423,672 | 222,203
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition |  |
Financial instruments | (423,408) | (221,792)
Net Amount | 264 | 411
Total |  |
Gross Amounts of Recognized Liabilities | 2,216,366 | 1,231,321
Gross Amounts Offset in the Consolidated Statement of Financial Condition | (1,792,466) | (1,009,038)
Net Amounts of Liabilities Presented in the Consolidated Statement of Financial Condition | 423,900 | 222,283
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition |  |
Financial instruments | (423,622) | (221,872)
Net Amount | 278 | 411
Receivables from broker dealers and clearing organizations | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition |  |
Net variation margin on long and short futures contracts | (10,400) | 18,000
Payables to broker dealers and clearing organizations | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition |  |
Net variation margin on long and short futures contracts | (4,700) | (3,500)
Currency forwards |  |
Trading liabilities, at fair value: |  |
Gross Amounts of Recognized Liabilities | 1,792,466 | 1,009,038
Gross Amounts Offset in the Consolidated Statement of Financial Condition | (1,792,466) | (1,009,038)
Options |  |
Trading liabilities, at fair value: |  |
Gross Amounts of Recognized Liabilities | 228 | 80
Net Amounts of Assets Presented in the Consolidated Statement of Financial Condition | 228 | 80
Gross Amounts Not Offset in the Consolidated Statement of Financial Condition |  |
Financial instruments | (214) | $ (80)
Net Amount | $ 14 |

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