CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 37,187	$ 46,259	$ 21,847
Other comprehensive loss income:
Change in pension plans, net of income taxes of $1,409, $55 and $1,595, respectively	(2,400)	(90)	(2,603)
Foreign currency translation adjustments	(10,965)	(10,334)	(12,714)
Total other comprehensive loss, net of tax	(13,365)	(10,424)	(15,317)
Comprehensive income	$ 23,822	$ 35,835	$ 6,530