CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) (Unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income		$ 28,484	$ 15,220	$ 69,272	$ 27,427
Other comprehensive income/(loss), before tax:
Foreign currency translation adjustments		(7,847)	11,974	(21,193)	39,348
Pension/postretirement curtailment gain		(232)		(750)
Amortization of pension liability adjustments:
Prior service credit	[1]	(1,114)	(1,113)	(3,341)	(3,339)
Net actuarial loss	[1]	1,294	1,350	3,882	4,050
Payments and amortization related to interest rate swaps included in earnings		(96)	295	138	1,238
Derivative valuation adjustment		1,777	(96)	9,703	(1,094)
Income taxes related to items of other comprehensive income/(loss):
Pension/postretirement curtailment gain		70		225
Amortization of pension liability adjustment		(54)	(71)	(162)	(213)
Payments and amortization related to interest rate swaps included in earnings		23	(112)	(33)	(470)
Derivative valuation adjustment		(427)	36	(2,329)	415
Comprehensive income		21,878	27,483	55,412	67,362
Comprehensive income/(loss) attributable to the noncontrolling interest		264	(43)	446	221
Comprehensive income attributable to the Company		$ 21,614	$ 27,526	$ 54,966	$ 67,141

[1] These accumulated other comprehensive income components are included in Other (income)/expense, net (see Note 4).