CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 10,675	$ 12,785	$ 35,469	$ 32,767
Other comprehensive income:
Foreign currency translation adjustments	9,438	(1,056)	23,951	(2,324)
Pension liability adjustment, net of tax	172	142	516	427
Unrealized gain/(loss) on hedging activities, net of tax	37	0	(7)	0
Comprehensive income	$ 20,322	$ 11,871	$ 59,929	$ 30,870