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Derivative Instruments - Not Designated as Hedging Instruments by Classification and Amount of Gains and Losses (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain Recognized in the Statements of Operations | $ 14,688 | $ 25,955
Foreign currency forward exchange contracts | Other non-operating income/expense |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain Recognized in the Statements of Operations | 14,688 | 25,569
Foreign currency forward exchange contracts | Cost of sales |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain Recognized in the Statements of Operations | $ 0 | $ 386

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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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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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