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Derivative Instruments - Gain From Derivative Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Gain impact of derivative instruments not designated as hedging instruments |  |
Gain impact that derivative instruments not designated as hedging instruments had on results of operations | $ 114,210 | $ 307,983
Futures |  |
Gain impact of derivative instruments not designated as hedging instruments |  |
Gain impact that derivative instruments not designated as hedging instruments had on results of operations | 165,590 | 308,480
Currency forwards |  |
Gain impact of derivative instruments not designated as hedging instruments |  |
Gain impact that derivative instruments not designated as hedging instruments had on results of operations | (51,381) | (425)
Options |  |
Gain impact of derivative instruments not designated as hedging instruments |  |
Gain impact that derivative instruments not designated as hedging instruments had on results of operations | $ 1 | (74)
Interest rate swaps |  |
Gain impact of derivative instruments not designated as hedging instruments |  |
Gain impact that derivative instruments not designated as hedging instruments had on results of operations |  | $ 2

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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