Accumulated Other Comprehensive Income (Loss) (Reclassifications out of AOCI) (Details 3) - 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
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense		$ 11,810			$ 11,579			$ 37,878	$ 38,969
Provision for Income Taxes		9,400			12,600			70,400	26,800
Net of Tax		21,134	$ (124,171)	$ (52,977)	(33,840)	$ 66,615	$ (96,566)	(156,014)	(63,791)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net of Tax		(12,302)			(12,768)			(27,849)	(37,985)
Foreign Currency Translation Adjustment [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, net of tax								0
Pension and Other Postretirement Plans [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, before tax		(10,063)			(17,367)			(30,443)	(51,791)
Provision for Income Tax		2,589			4,476			7,831	13,348
Reclassifications, net of tax		(7,474)			(12,891)			(22,612)	(38,443)
Net Prior Service (Credit) Cost [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, before tax	[1]	410			716			1,230	2,148
Provision for Income Tax		(105)			(185)			(316)	(554)
Reclassifications, net of tax		305			531			914	1,594
Net Actuarial Gain [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, before tax	[1]	(10,473)			(18,083)			(31,673)	(53,939)
Provision for Income Tax		2,694			4,661			8,147	13,902
Reclassifications, net of tax		(7,779)			(13,422)			(23,526)	(40,037)
Cash Flow Hedges [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, net of tax								(5,237)
Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense		$ (4,828)			$ 123			$ (5,237)	$ 458

[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.