Accumulated Other Comprehensive Income (Loss) (Reclassifications out of AOCI) (Details 3) - USD ($) $ in Thousands		3 Months Ended						9 Months Ended
		Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense		$ 6,776			$ 6,135			$ 22,587	$ 31,371
Provision for Income Taxes		15,200			10,000			59,500	39,700
Net of Tax		(42,965)	$ (57,195)	$ (81,702)	(125,070)	$ (46,635)	$ (42,965)	(181,862)	(214,670)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net of Tax		(1,066)			(2,401)			(3,574)	(5,733)
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		(1,443)			(3,226)			(4,744)	(7,741)
Provision for Income Tax		390			873			1,281	2,090
Reclassifications, net of tax		(1,053)			(2,353)			(3,463)	(5,651)
Net Prior Service (Credit) Cost [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, before tax	[1]	(932)			69			(3,210)	215
Provision for Income Tax		252			(18)			867	(58)
Reclassifications, net of tax		(680)			51			(2,343)	157
Net Actuarial Gain [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, before tax	[1]	(511)			(3,295)			(1,534)	(7,956)
Provision for Income Tax		138			891			414	2,148
Reclassifications, net of tax		(373)			(2,404)			(1,120)	(5,808)
Cash Flow Hedges [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, net of tax								(111)
Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense		(24)			(59)			(151)	(101)
Provision for Income Taxes		11			11			40	19
Net of Tax		$ (13)			$ (48)			$ (111)	$ (82)

[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.