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Derivatives - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative Instruments,Gain (Loss) [Line Items]
Net gain (loss) on foreign currency exchange contracts	$ 69	$ (1,488)	$ 603	$ (2,852)
Not Designated as Hedging Instrument | Foreign Currency Exchange Contracts | Other Income (Expense), Net
Derivative Instruments,Gain (Loss) [Line Items]
Net gain (loss) on foreign currency exchange contracts	$ 100	$ (1,500)	$ 600	$ (2,900)

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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