Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Consolidated Statements of Comprehensive Income
Net income	$ 14,669	$ 13,932	$ 28,584	$ 23,438
Other comprehensive (loss) income:
Foreign currency translation adjustments	(2,321)	489	(1,300)	2,404
Amortization of actuarial loss and other adjustments from pension plan	30	29	60	57
Total other comprehensive (loss) income	(2,291)	518	(1,240)	2,461
Comprehensive income	$ 12,378	$ 14,450	$ 27,344	$ 25,899