CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 11,186	$ 4,158	$ 40,940	$ 16,114
Other comprehensive income:
Foreign currency translation adjustments	(1,318)	(7,840)	(7,305)	(7,843)
Pension liability adjustment, net of tax	136	1,199	410	1,422
Comprehensive income (loss)	$ 10,004	$ (2,483)	$ 34,045	$ 9,693