Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance				$ (462,243)
Before reclassifications to income and retained earnings				(87,779)
Reclassifications to income				12,254
Net other comprehensive income		$ 37,355	$ 104,088	(75,525)	$ 202,708
Ending Balance		(537,768)		(537,768)
Foreign Currency Translation Gains (Losses) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance				(274,830)
Before reclassifications to income and retained earnings				(53,805)
Net other comprehensive income				(53,805)
Ending Balance		(328,635)		(328,635)
Retirement and Postretirement Benefit Plan Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance				(178,987)
Before reclassifications to income and retained earnings				(32,159)
Reclassifications to income	[1]			10,498
Net other comprehensive income				(21,661)
Ending Balance		(200,648)		(200,648)
Reclassifications before taxes, included in net periodic benefit expense				13,111
Reclassifications, income tax expense				2,613
Deferred Loss On Interest Rate Derivative Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance				(8,426)
Before reclassifications to income and retained earnings				(1,815)
Reclassifications to income	[2]			1,756
Net other comprehensive income				(59)
Ending Balance		$ (8,485)		(8,485)
Reclassifications before taxes, included in net periodic benefit expense				2,222
Reclassifications income tax, included in interest expense				$ 466

[1] Reclassifications before taxes of $13,111 are included in the computation of net periodic benefit expense for the nine-month period ended September 30, 2018. See Note H for additional information. Related income taxes of $2,613 are included in Income tax expense (benefit) for the nine-month period ended September 30, 2018.

[2] Reclassifications before taxes of $2,222 are included in Interest expense, net, for the nine-month period ended September 30, 2018. Related income taxes of $466 are included in Income tax expense (benefit) for the nine-month period ended September 30, 2018. See Note L for additional information.