Accumulated Other Comprehensive Income (Loss) (Components of OCI) (Details 1) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before tax		$ (8,352)		$ (6,451)		$ (34,006)	$ (8,744)
Other Comprehensive Income (Loss), income tax		3,037		2,305		6,199	5,183
Other Comprehensive Income (Loss), Net of Tax		(5,315)	$ (22,492)	(4,146)	$ 585	(27,807)	(3,561)
Foreign Currency Translation Adjustment [Member]
Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax						(9,767)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax						0
Other Comprehensive Income (Loss), before tax		3,517		2,384		(9,767)	11,378
Other Comprehensive Income (Loss), income tax		0		0		0	0
Other Comprehensive Income (Loss), Net of Tax		3,517		2,384		(9,767)	11,378
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		(12,215)		(10,023)		(25,696)	(20,380)
Reclassification from AOCI, Current Period, Tax		3,128		2,578		6,579	5,242
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(9,087)		(7,445)		(19,117)	(15,138)
Other Comprehensive Income (Loss), before tax		(12,215)		(10,023)		(25,696)	(20,380)
Other Comprehensive Income (Loss), income tax		3,128		2,578		6,579	5,242
Other Comprehensive Income (Loss), Net of Tax		(9,087)		(7,445)		(19,117)	(15,138)
Net Prior Service (Credit) Cost [Member]
Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	(482)		411		(976)	820
Reclassification from AOCI, Current Period, Tax		124		(106)		250	(211)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(358)		305		(726)	609
Net Actuarial Gain [Member]
Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	(11,733)		(10,434)		(24,720)	(21,200)
Reclassification from AOCI, Current Period, Tax		3,004		2,684		6,329	5,453
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(8,729)		(7,750)		(18,391)	(15,747)
Cash Flow Hedges [Member]
Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax						1,322
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax						(245)
Other Comprehensive Income (Loss), before tax		346		1,188		1,457	258
Other Comprehensive Income (Loss), income tax		(91)		(273)		(380)	(59)
Other Comprehensive Income (Loss), Net of Tax		$ 255		$ 915		$ 1,077	$ 199

[1] These accumulated other comprehensive income (loss) 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.