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Derivatives - Additional Disclosures (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Derivative Instruments,Gain (Loss) [Line Items] |  |  |  |
Net loss on foreign currency exchange contracts | $ 1,488 | $ 218 | $ 2,852 | $ 894
Other income (expense), net | Not designated as hedging instrument | Foreign currency exchange contracts |  |  |  |
Derivative Instruments,Gain (Loss) [Line Items] |  |  |  |
Net loss on foreign currency exchange contracts | $ 1,500 | $ 200 | $ 2,900 | $ 900

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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + 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=84234895&loc=SL5618551-113959 + Details
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