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Financial Assets and Liabilities - Netting of Certain Financial Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Securities loaned |  |
Gross Amounts of Recognized Liabilities | $ 819,903 | $ 1,130,039
Net Amounts of Liabilities Presented in the Condensed Consolidated Statement of Financial Condition | 819,903 | 1,130,039
Gross Amounts Not Offset In the Condensed Consolidated Statement of Financial Condition |  |
Financial Instruments | (806,960) | (1,108,461)
Cash Collateral Pledged | (5,242) | (8,822)
Net Amount | 7,701 | 12,756
Securities sold under agreements to repurchase |  |
Gross Amounts of Recognized Liabilities | 290,000 | 281,861
Net Amounts of Liabilities Presented in the Condensed Consolidated Statement of Financial Condition | 290,000 | 281,861
Gross Amounts Not Offset In the Condensed Consolidated Statement of Financial Condition |  |
Financial Instruments | (290,000) | (281,861)
Cash Collateral Pledged | 0 | 0
Net Amount | 0 | 0
Total |  |
Gross Amounts of Recognized Liabilities | 2,333,946 | 4,143,700
Gross Amounts Offset in the Condensed Consolidated Statement of Financial Condition | (1,219,684) | (2,719,954)
Net Amounts of Liabilities Presented in the Condensed Consolidated Statement of Financial Condition | 1,114,262 | 1,423,746
Gross Amounts Not Offset In the Condensed Consolidated Statement of Financial Condition |  |
Financial Instruments | (1,100,874) | (1,401,373)
Cash Collateral Pledged | (5,242) | (9,614)
Net Amount | 8,146 | 12,759
Currency forwards |  |
Trading liabilities, at fair value: |  |
Gross Amounts of Recognized Liabilities | 1,219,684 | 2,720,749
Gross Amounts Offset in the Condensed Consolidated Statement of Financial Condition | (1,219,684) | (2,719,954)
Net Amounts of Liabilities Presented in the Condensed Consolidated Statement of Financial Condition | 0 | 795
Gross Amounts Not Offset In the Condensed Consolidated Statement of Financial Condition |  |
Financial Instruments | 0 | 0
Cash Collateral Pledged | 0 | (792)
Net Amount | 0 | 3
Options |  |
Trading liabilities, at fair value: |  |
Gross Amounts of Recognized Liabilities | 4,359 | 11,051
Gross Amounts Offset in the Condensed Consolidated Statement of Financial Condition | 0 | 0
Net Amounts of Liabilities Presented in the Condensed Consolidated Statement of Financial Condition | 4,359 | 11,051
Gross Amounts Not Offset In the Condensed Consolidated Statement of Financial Condition |  |
Financial Instruments | (3,914) | (11,051)
Cash Collateral Pledged | 0 | 0
Net Amount | $ 445 | $ 0

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