Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		$ (462,243)
Before reclassifications to income and retained earnings		(86,249)
Reclassifications to income		3,755
Net other comprehensive income (loss)		(82,494)	$ 25,533
Ending Balance		(544,737)
Reclassifications before taxes, included in net periodic benefit expense		4,041
Reclassifications, income tax expense		871
Reclassifications income tax, included in interest expense		156
Foreign Currency Translation Gains (Losses) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(274,830)
Before reclassifications to income and retained earnings		(52,275)
Net other comprehensive income (loss)		(52,275)
Ending Balance		(327,105)
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]	3,170
Net other comprehensive income (loss)		(28,989)
Ending Balance		(207,976)
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]	585
Net other comprehensive income (loss)		(1,230)
Ending Balance		$ (9,656)

[1] Reclassifications before taxes of $4,041 are included in the computation of net periodic benefit expense for the three-month period ended March 31, 2018. See Note H for additional information. Related income taxes of $871 are included in Income tax expense (benefit) for the three-month period ended March 31, 2018.

[2] Reclassifications before taxes of $741 are included in Interest expense, net, for the three-month period ended March 31, 2018. Related income taxes of $156 are included in Income tax expense (benefit) for the three-month period ended March 31, 2018. See Note L for additional information.