CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 29,590	$ 40,125	$ 69,633	$ 103,792
Other Comprehensive Income (Loss), before Tax [Abstract]
Foreign currency translation and other adjustments	19,249	(22,041)	3,047	(24,243)
Pension/postretirement settlements and curtailments	0	0	378	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent [Abstract]
Prior service credit	(1,114)	(1,105)	(3,342)	(3,315)
Net actuarial loss	1,244	1,118	3,720	3,357
Payments and amortization related to interest rate swaps included in earnings	1,219	(245)	2,742	(1,117)
Derivative valuation adjustment	(385)	(1,532)	(12,515)	(10,796)
Income taxes related to items of other comprehensive income/(loss):
Pension/postretirement settlements and curtailments	0	0	(113)	0
Amortization of pension liability adjustment	(32)	(4)	(94)	(13)
Payments and amortization related to interest rate swaps included in earnings	(311)	62	(701)	285
Derivative valuation adjustment	98	392	3,200	2,759
Comprehensive income	49,558	16,770	65,955	70,709
Comprehensive income/(loss) attributable to the noncontrolling interest	202	103	(957)	520
Comprehensive income/(loss) attributable to the Company	$ 49,356	$ 16,667	$ 66,912	$ 70,189