Accumulated Other Comprehensive Income (Loss) (Components of OCI) (Details 1) - USD ($) $ in Thousands		3 Months Ended						9 Months Ended
		Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before tax		$ (33,361)			$ (59,425)			$ (42,105)	$ (133,782)
Other Comprehensive Income (Loss), income tax		3,468			3,970			8,651	12,213
Other Comprehensive Income (Loss), Net of Tax		(29,893)	$ (4,146)	$ 585	(55,455)	$ (52,979)	$ (13,135)	(33,454)	(121,569)
Foreign Currency Translation Adjustment [Member]
Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax								(8,096)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax								0
Other Comprehensive Income (Loss), before tax		(19,474)			(44,260)			(8,096)	(86,926)
Other Comprehensive Income (Loss), income tax		0			0			0	0
Other Comprehensive Income (Loss), Net of Tax		(19,474)			(44,260)			(8,096)	(86,926)
Pension and Other Postretirement Plans [Member]
Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax								0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		(10,063)			(17,367)			(30,443)	(51,791)
Reclassification from AOCI, Current Period, Tax		2,589			4,476			7,831	13,348
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(7,474)			(12,891)			(22,612)	(38,443)
Other Comprehensive Income (Loss), before tax		(10,063)			(17,367)			(30,443)	(51,791)
Other Comprehensive Income (Loss), income tax		2,589			4,476			7,831	13,348
Other Comprehensive Income (Loss), Net of Tax		(7,474)			(12,891)			(22,612)	(38,443)
Net Prior Service (Credit) Cost [Member]
Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	410			716			1,230	2,148
Reclassification from AOCI, Current Period, Tax		(105)			(185)			(316)	(554)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		305			531			914	1,594
Net Actuarial Gain [Member]
Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	(10,473)			(18,083)			(31,673)	(53,939)
Reclassification from AOCI, Current Period, Tax		2,694			4,661			8,147	13,902
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(7,779)			(13,422)			(23,526)	(40,037)
Cash Flow Hedges [Member]
Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax								2,491
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax								(5,237)
Other Comprehensive Income (Loss), before tax		(3,824)			2,202			(3,566)	4,935
Other Comprehensive Income (Loss), income tax		879			(506)			820	(1,135)
Other Comprehensive Income (Loss), Net of Tax		$ (2,945)			$ 1,696			$ (2,746)	$ 3,800

[1] These accumulated other comprehensive income components are included in the computation of net periodic pension and postretirement plan cost (see Note 11) and are included in non-operating pension and postretirement benefit income in the Company’s Condensed Consolidated Statements of Operations.