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Derivative Instruments - Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Equities futures | Not designated as hedging instruments | Receivables from broker dealers and clearing organizations |  |
Fair value of derivative instruments on a gross basis |  |
Derivatives Assets, Fair Value | $ 183 | $ (505)
Derivatives Assets, Notional | 4,836,630 | 1,985,770
Equities futures | Not designated as hedging instruments | Payables to broker dealers and clearing organizations |  |
Fair value of derivative instruments on a gross basis |  |
Derivatives Liabilities, Fair Value | 208 | (575)
Derivatives Liabilities, Notional | 139,033 | 142,658
Commodity futures | Not designated as hedging instruments | Receivables from broker dealers and clearing organizations |  |
Fair value of derivative instruments on a gross basis |  |
Derivatives Assets, Fair Value | 39,965 | 971
Derivatives Assets, Notional | 20,971,297 | 21,231,001
Commodity futures | Not designated as hedging instruments | Payables to broker dealers and clearing organizations |  |
Fair value of derivative instruments on a gross basis |  |
Derivatives Liabilities, Fair Value | 645 | (1,602)
Derivatives Liabilities, Notional | 118,427 | 130,042
Currency futures | Not designated as hedging instruments | Receivables from broker dealers and clearing organizations |  |
Fair value of derivative instruments on a gross basis |  |
Derivatives Assets, Fair Value | 32,042 | 26,548
Derivatives Assets, Notional | 2,075,544 | 3,994,412
Currency futures | Not designated as hedging instruments | Payables to broker dealers and clearing organizations |  |
Fair value of derivative instruments on a gross basis |  |
Derivatives Liabilities, Fair Value | (3,279) | (13,947)
Derivatives Liabilities, Notional | 2,531,734 | 7,756,958
Fixed Income futures | Not designated as hedging instruments | Receivables from broker dealers and clearing organizations |  |
Fair value of derivative instruments on a gross basis |  |
Derivatives Assets, Fair Value | 23 | 73
Derivatives Assets, Notional | 10,096 | 44,395
Fixed Income futures | Not designated as hedging instruments | Payables to broker dealers and clearing organizations |  |
Fair value of derivative instruments on a gross basis |  |
Derivatives Liabilities, Fair Value | (169) | (1)
Derivatives Liabilities, Notional | 13,016 | 2,584
Currency forwards |  |
Fair value of derivative instruments on a gross basis |  |
Derivatives Assets, Fair Value | 702,889 | 2,045,487
Derivatives Liabilities, Fair Value | 725,422 | 2,032,017
Currency forwards | Not designated as hedging instruments | Financial instruments owned |  |
Fair value of derivative instruments on a gross basis |  |
Derivatives Assets, Fair Value | 702,889 | 2,045,487
Derivatives Assets, Notional | 100,689,302 | 124,000,221
Currency forwards | Not designated as hedging instruments | Financial instruments sold, not yet purchased |  |
Fair value of derivative instruments on a gross basis |  |
Derivatives Liabilities, Fair Value | 725,058 | 2,032,017
Derivatives Liabilities, Notional | 100,700,387 | 123,993,234
Currency forwards | Derivative instruments designed as hedging instruments: | Financial instruments sold, not yet purchased |  |
Fair value of derivative instruments on a gross basis |  |
Derivatives Liabilities, Fair Value | (364) | (514)
Derivatives Liabilities, Notional | 15,964 | 16,115
Options |  |
Fair value of derivative instruments on a gross basis |  |
Derivatives Assets, Fair Value | 9,210 | 7,045
Derivatives Liabilities, Fair Value | 15,548 | 5,839
Options | Not designated as hedging instruments | Financial instruments owned |  |
Fair value of derivative instruments on a gross basis |  |
Derivatives Assets, Fair Value | 9,210 | 7,045
Derivatives Assets, Notional | 793,423 | 682,369
Options | Not designated as hedging instruments | Financial instruments sold, not yet purchased |  |
Fair value of derivative instruments on a gross basis |  |
Derivatives Liabilities, Fair Value | 15,548 | 5,839
Derivatives Liabilities, Notional | $ 769,273 | $ 681,147

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=64830801&loc=SL51823488-111719 + Details
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