Other Income and Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Income and Expenses [Abstract]
Interest income	$ (4,133)	$ (3,215)	$ (1,326)
Foreign currency (gain) loss, net	1,451	11,823	(3,592)
Loss on debt retirement	1,512	4,835	0
Other (income) expense, net	(5,447)	(953)	(827)
Total other (income) expense, net	$ (6,617)	$ 12,490	$ (5,745)