Accumulated Other Comprehensive Income (Loss) (Reclassifications out of AOCI) (Details 3) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense		$ 8,386		$ 17,165		$ 15,811	$ 25,236
Provision for Income Taxes		16,700		16,100		44,300	29,700
Net of Tax		(57,195)	$ (81,702)	(46,635)	$ (42,965)	(138,897)	(89,600)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net of Tax		(1,070)		(2,391)		(2,508)	(3,332)
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		(1,406)		(3,224)		(3,301)	(4,515)
Provision for Income Tax		380		869		891	1,217
Reclassifications, net of tax		(1,026)		(2,355)		(2,410)	(3,298)
Net Prior Service (Credit) Cost [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, before tax	[1]	(931)		70		(2,278)	146
Provision for Income Tax		251		(19)		615	(40)
Reclassifications, net of tax		(680)		51		(1,663)	106
Net Actuarial Gain [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, before tax	[1]	(475)		(3,294)		(1,023)	(4,661)
Provision for Income Tax		129		888		276	1,257
Reclassifications, net of tax		(346)		(2,406)		(747)	(3,404)
Cash Flow Hedges [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, net of tax						(98)
Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense		(58)		(45)		(127)	(42)
Provision for Income Taxes		14		9		29	8
Net of Tax		$ (44)		$ (36)		$ (98)	$ (34)

[1] These accumulated other comprehensive income components are components 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.