Other Income and Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Other Income and Expenses [Abstract]
Interest income	$ (2,064)	$ (988)
Foreign currency (gain) loss, net	(2,013)	4,713
Other	(488)	(293)
Other (income) expense, net	$ (4,565)	$ 3,432