Consolidated Statements of Comprehensive Income/(Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Consolidated Statements of Comprehensive Income/(Loss) [Abstract]
Net income	$ 57,265	$ 41,749	$ 17,658
Other comprehensive income, before tax:
Foreign currency translation adjustments	(51,177)	(54,850)	8,135
Pension/postretirement settlements and curtailments	103	8,377	46
Pension/postretirement plan remeasurement	$ (700)	$ (14,707)	20,500
Pension/postretirement plan amendments			7,361
Amortization of pension liability adjustments:
Transition obligation			70
Prior service credit	$ (4,440)	$ (4,436)	(3,905)
Net actuarial loss	5,932	5,329	6,512
Payments related to interest rate swaps included in earnings	1,988	1,914	1,900
Derivative valuation adjustment	$ (2,961)	(1,724)	1,216
Income taxes related to items of other comprehensive income:
Pension/postretirement settlements and curtailments		(3,210)	(18)
Pension/postretirement plan remeasurement	$ 78	$ 5,442	(6,757)
Pension/postretirement plan amendments			(2,871)
Amortization of pension liability adjustments	$ (270)	$ (330)	(451)
Payments related to interest rate swaps included in earnings	(755)	(746)	(741)
Derivative valuation adjustment	1,125	672	(474)
Comprehensive income/(loss)	6,188	(16,520)	$ 48,181
Comprehensive (loss)/income attributable to the noncontrolling interest	(9)	178
Comprehensive income/(loss) attributable to the Company	$ 6,197	$ (16,698)	$ 48,181