Accumulated Other Comprehensive Income (Loss) (Components of OCI) (Details 1) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before tax		$ (6,451)		$ (57,203)		$ (8,744)	$ (74,357)
Other Comprehensive Income (Loss), income tax		2,305		4,224		5,183	8,243
Other Comprehensive Income (Loss), Net of Tax		(4,146)	$ 585	(52,979)	$ (13,135)	(3,561)	(66,114)
Foreign Currency Translation Adjustment [Member]
Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax						11,378
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax						0
Other Comprehensive Income (Loss), before tax		2,384		(40,928)		11,378	(42,666)
Other Comprehensive Income (Loss), income tax		0		0		0	0
Other Comprehensive Income (Loss), Net of Tax		2,384		(40,928)		11,378	(42,666)
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		(10,023)		(17,366)		(20,380)	(34,424)
Reclassification from AOCI, Current Period, Tax		2,578		4,475		5,242	8,872
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(7,445)		(12,891)		(15,138)	(25,552)
Other Comprehensive Income (Loss), before tax		(10,023)		(17,366)		(20,380)	(34,424)
Other Comprehensive Income (Loss), income tax		2,578		4,475		5,242	8,872
Other Comprehensive Income (Loss), Net of Tax		(7,445)		(12,891)		(15,138)	(25,552)
Net Prior Service (Credit) Cost [Member]
Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	411		716		820	1,432
Reclassification from AOCI, Current Period, Tax		(106)		(185)		(211)	(369)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		305		531		609	1,063
Net Actuarial Gain [Member]
Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	(10,434)		(18,082)		(21,200)	(35,856)
Reclassification from AOCI, Current Period, Tax		2,684		4,660		5,453	9,241
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(7,750)		(13,422)		(15,747)	(26,615)
Cash Flow Hedges [Member]
Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax						608
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax						(409)
Other Comprehensive Income (Loss), before tax		1,188		1,091		258	2,733
Other Comprehensive Income (Loss), income tax		(273)		(251)		(59)	(629)
Other Comprehensive Income (Loss), Net of Tax		$ 915		$ 840		$ 199	$ 2,104

[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.