Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance				$ (628,212)
Before reclassifications to income				194,097
Reclassifications to income				8,611
Net other comprehensive income		$ 104,088	$ (34,372)	202,708	$ 133,511
Ending Balance		(425,504)		(425,504)
Reclassifications before taxes, included in net periodic benefit expense				11,039
Reclassifications income tax, included in net periodic benefit expense				3,873
Reclassifications before taxes, included in interest expense				2,222
Reclassifications income tax, included in interest expense				777
Foreign Currency Translation Gains (Losses) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance				(446,555)
Before reclassifications to income				194,094
Net other comprehensive income				194,094
Ending Balance		(252,461)		(252,461)
Retirement and Postretirement Benefit Plan Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance				(171,305)
Before reclassifications to income				3
Reclassifications to income	[1]			7,166
Net other comprehensive income				7,169
Ending Balance		(164,136)		(164,136)
Deferred Loss On Interest Rate Derivative Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance				(10,352)
Reclassifications to income	[2]			1,445
Net other comprehensive income				1,445
Ending Balance		$ (8,907)		$ (8,907)

[1] Reclassifications before taxes of $11,039 for the nine-month period ended September 30, 2017 are included in the computation of net periodic benefit expense. See Note G for additional information. Related income taxes of $3,873 for the nine-month period ended September 30, 2017 are included in Income tax expense.

[2] Reclassifications before taxes of $2,222 for the nine-month period ended September 30, 2017 are included in Interest expense, net. Related income taxes of $777 for the nine-month period ended September 30, 2017 are included in Income tax expense.