CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income		$ 30,306	$ 1,233	$ 40,788	$ 12,207
Other comprehensive income/(loss), before tax:
Foreign currency translation adjustments		(30,851)	17,436	(13,346)	27,374
Pension/postretirement curtailment		(518)		(518)
Amortization of pension liability adjustments:
Prior service credit	[1]	(1,113)	(1,113)	(2,227)	(2,226)
Net actuarial loss	[1]	1,291	1,353	2,588	2,700
Payments and amortization related to interest rate swaps included in earnings		54	343	234	943
Derivative valuation adjustment		2,211	(1,414)	7,926	(998)
Income taxes related to items of other comprehensive income/(loss):
Pension/postretirement curtailment		155		155
Amortization of pension liability adjustment		(53)	(72)	(108)	(142)
Payments related to interest rate swaps included in earnings		(13)	(130)	(56)	(358)
Derivative valuation adjustment		(530)	537	(1,902)	379
Comprehensive income		939	18,173	33,534	39,879
Comprehensive income attributable to the noncontrolling interest		(48)	124	182	264
Comprehensive income attributable to the Company		$ 987	$ 18,049	$ 33,352	$ 39,615

[1] These accumulated other comprehensive income components are included in Other expense, net (see Note 4). The curtailment adjustment was included in restructuring expenses, net.