CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 10,974	$ 13,316
Other comprehensive income/(loss), before tax:
Foreign currency translation adjustments	9,938	12,741
Pension/postretirement plan remeasurement		(170)
Amortization of pension liability adjustments:
Prior service credit	(1,113)	(1,113)
Net actuarial loss	1,347	1,278
Payments related to interest rate swaps included in earnings	600	281
Derivative valuation adjustment	416	(2,852)
Income taxes related to items of other comprehensive income/(loss):
Pension/postretirement plan remeasurement		65
Amortization of pension liability adjustment	(70)	(49)
Payments related to interest rate swaps included in earnings	(228)	(107)
Derivative valuation adjustment	(158)	1,084
Comprehensive income	21,706	24,474
Comprehensive income/(loss) attributable to the noncontrolling interest	140	(188)
Comprehensive income attributable to the Company	$ 21,566	$ 24,662