CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 1,233	$ 10,101	$ 12,207	$ 23,417
Other comprehensive income/(loss), before tax:
Foreign currency translation adjustments	17,436	(10,126)	27,374	2,615
Pension/postretirement plan remeasurement				(170)
Amortization of pension liability adjustments:
Prior service credit	(1,113)	(1,112)	(2,226)	(2,225)
Net actuarial loss	1,353	1,296	2,700	2,574
Payments related to interest rate swaps included in earnings	343	305	943	586
Derivative valuation adjustment	(1,414)	(4,581)	(998)	(7,433)
Income taxes related to items of other comprehensive income/(loss):
Pension/postretirement plan remeasurement				65
Amortization of pension liability adjustment	(72)	(56)	(142)	(105)
Payments related to interest rate swaps included in earnings	(130)	(116)	(358)	(223)
Derivative valuation adjustment	537	1,741	379	2,825
Comprehensive income	18,173	(2,548)	39,879	21,926
Comprehensive income/(loss) attributable to the noncontrolling interest	124	(264)	264	(452)
Comprehensive income attributable to the Company	$ 18,049	$ (2,284)	$ 39,615	$ 22,378