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Derivatives - Impact of Derivatives Contracts on Condensed Consolidated Statements of Operations (Details) - Not Designated as Hedging Instrument - Other income (expense), net - Foreign currency contracts - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative [Line Items]
Unrealized gain (loss) on foreign currency contracts	$ (323)	$ 681	$ 442	$ (49)
Realized gain (loss) on foreign currency contracts	447	(1,794)	572	(2,346)
Total net gain (loss) on foreign currency contracts	$ 124	$ (1,113)	$ 1,014	$ (2,395)

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

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- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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- Definition

Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References

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