Other Income (Expense), Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Income and Expenses [Abstract]
Net gain (loss) on foreign currency exchange contracts	$ (1,331)	$ 234
Net gain (loss) on foreign currency exchange transactions	725	330
Other income	19	19
Other income (expense), net	$ (587)	$ 583