Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		$ (462,243)	$ (628,212)
Before reclassifications to income		(163,676)	154,456
Reclassifications to income		16,132	11,513
Net other comprehensive income		(147,544)	165,969	$ 76,330
Ending Balance		(609,787)	(462,243)	(628,212)
Reclassifications before taxes, included in net periodic benefit expense		14,821	17,313
Reclassifications, income tax expense		5,234	3,523
Reclassifications income tax, included in interest expense		622	1,037
Foreign Currency Translation Gains (Losses) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(274,830)	(446,555)
Before reclassifications to income		(145,022)	171,725
Reclassifications to income
Net other comprehensive income		(145,022)	171,725
Ending Balance		(419,852)	(274,830)	(446,555)
Retirement and Postretirement Benefit Plan Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(178,987)	(171,305)
Before reclassifications to income		(16,839)	(17,269)
Reclassifications to income	[1]	13,790	9,587
Net other comprehensive income		(3,049)	(7,682)
Ending Balance		(182,036)	(178,987)	(171,305)
Deferred Loss On Interest Rate Derivative Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(8,426)	(10,352)
Before reclassifications to income		(1,815)
Reclassifications to income	[2]	2,342	1,926
Net other comprehensive income		527	1,926
Ending Balance		$ (7,899)	$ (8,426)	$ (10,352)

[1] Reclassifications before taxes of $17,313 and $14,821 are included in the computation of net periodic benefit expense in 2018 and 2017, respectively. See Note L for additional information. Related income taxes of $3,523 and $5,234 are included in income tax expense in 2018 and 2017, respectively.

[2] Reclassifications before taxes of $2,963 are included in Interest expense in both 2018 and 2017. Related income taxes of $622 and $1,037 are included in income tax expense in 2018 and 2017. See Note M for additional information.