Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017		Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	[1]	$ (628,212)
Before reclassifications to income	[1]	22,664
Reclassifications to income	[1]	2,869
Net other comprehensive income		25,533	[1]	$ 151,667
Ending Balance	[1]	(602,679)
Reclassifications before taxes, included in net periodic benefit expense		3,678
Reclassifications income tax, included in net periodic benefit expense		1,291
Amount of loss reclassified to interest expense		700		$ 700
Reclassifications income tax, included in interest expense		259
Foreign Currency Translation Gains (Losses) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	[1]	(446,555)
Before reclassifications to income	[1]	22,664
Net other comprehensive income	[1]	22,664
Ending Balance	[1]	(423,891)
Retirement and Postretirement Benefit Plan Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	[1]	(171,305)
Reclassifications to income	[1],[2]	2,387
Net other comprehensive income	[1]	2,387
Ending Balance	[1]	(168,918)
Deferred Loss On Interest Rate Derivative Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	[1]	(10,352)
Reclassifications to income	[1],[3]	482
Net other comprehensive income	[1]	482
Ending Balance	[1]	$ (9,870)

[1] All amounts are presented net of income taxes.

[2] Reclassifications before taxes of $3,678 for the three-month period ended March 31, 2017 are included in the computation of net periodic benefit expense. See Note F for additional information. Related income taxes of $1,291 for the three-month period ended March 31, 2017 are included in Income tax expense.

[3] Reclassifications before taxes of $741 for the three-month period ended March 31, 2017 are included in Interest expense. Related income taxes of $259 for the three-month period ended March 31, 2017 are included in Income tax expense.