Consolidated Statements of Comprehensive Income/(Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 31,440	$ 32,449	$ 59,050	$ 40,043
Other comprehensive income/(loss), before tax:
Foreign currency translation and other adjustments	13,651	8,753	(1,788)	(16,202)
Pension/postretirement settlements and curtailments	0	378	0	378
Amortization of pension liability adjustments:
Amortization of prior service credit	(1,118)	(1,114)	(2,237)	(2,228)
Net actuarial loss	1,108	1,232	2,217	2,476
Payments and amortization related to interest rate swaps included in earnings	1,770	1,116	3,246	1,523
Derivative valuation adjustment	125	(1,366)	(353)	(12,130)
Income taxes related to items of other comprehensive income/(loss):
Pension/postretirement settlements and curtailments	0	(113)	0	(113)
Amortization of prior service cost	335	278	671	557
Amortization of net actuarial loss	(332)	(308)	(665)	(619)
Payments and amortization related to interest rate swaps included in earnings	(457)	(286)	(838)	(390)
Derivative valuation adjustment	(44)	349	91	3,102
Comprehensive income/(loss)	46,478	41,368	59,394	16,397
Comprehensive income/(loss) attributable to the noncontrolling interest	226	247	43	(1,159)
Comprehensive income/(loss) attributable to the Company	$ 46,252	$ 41,121	$ 59,351	$ 17,556