Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017		Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	[1]			$ (628,212)
Before reclassifications to income	[1]			92,884
Reclassifications to income	[1]			5,736
Net other comprehensive income		$ 73,087	$ 16,216	98,620	[1]	$ 167,883
Ending Balance	[1]	(529,592)		(529,592)
Reclassifications before taxes, included in net periodic benefit expense				7,354
Reclassifications income tax, included in net periodic benefit expense				2,581
Reclassifications income tax, included in interest expense				519
Foreign Currency Translation Gains (Losses) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	[1]			(446,555)
Before reclassifications to income	[1]			92,884
Net other comprehensive income	[1]			92,884
Ending Balance	[1]	(353,671)		(353,671)
Retirement and Postretirement Benefit Plan Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	[1]			(171,305)
Reclassifications to income	[1],[2]			4,773
Net other comprehensive income	[1]			4,773
Ending Balance	[1]	(166,532)		(166,532)
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]			963
Net other comprehensive income	[1]			963
Ending Balance	[1]	$ (9,389)		$ (9,389)

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

[2] Reclassifications before taxes of $7,354 for the six-month period ended June 30, 2017 are included in the computation of net periodic benefit expense. See Note G for additional information. Related income taxes of $2,581 for the six-month period ended June 30, 2017 are included in Income tax expense.

[3] Reclassifications before taxes of $1,482 for the six-month period ended June 30, 2017 are included in Interest expense. Related income taxes of $519 for the six-month period ended June 30, 2017 are included in Income tax expense.