Accumulated Other Comprehensive Income (Loss) (Reclassifications out of AOCI) (Details 3) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense		$ 7,377		$ 8,386		$ 15,055	$ 15,811
Provision for (Benefit from) Income Taxes		41,900		16,700		(3,500)	44,300
Net of Tax		(18,862)	$ 33,891	(57,195)	$ (81,702)	15,029	(138,897)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net of Tax		897		(1,070)		1,583	(2,508)
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		1,058		(1,406)		1,949	(3,301)
(Benefit from) Provision for Income Tax		(285)		380		(526)	891
Reclassifications, net of tax		773		(1,026)		1,423	(2,410)
Net Prior Service (Credit) Cost [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, before tax	[1]	668		(931)		1,339	(2,278)
(Benefit from) Provision for Income Tax		(181)		251		(362)	615
Reclassifications, net of tax		487		(680)		977	(1,663)
Net Actuarial Gain [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, before tax	[1]	390		(475)		610	(1,023)
(Benefit from) Provision for Income Tax		(104)		129		(164)	276
Reclassifications, net of tax		286		(346)		446	(747)
Cash Flow Hedges [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, net of tax						160
Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense		118		(58)		147	(127)
Provision for (Benefit from) Income Taxes		6		14		13	29
Net of Tax		$ 124		$ (44)		$ 160	$ (98)

[1] These accumulated other comprehensive income components are included in the computation of net periodic pension and postretirement plan cost (see Note 12) and are included in non-operating pension and postretirement benefit income in the Company’s Condensed Consolidated Statements of Operations.