Income Taxes (Summary Of Components Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Asset provisions and liabilities	$ 4,832	$ 11,512
Inventory writedowns	3,408	10,874
Tax loss and credit carryforwards	3,908	3,708
Difference between book and tax basis of depreciable and amortizable assets	20,218	30,855
Share-based payments and deferred compensation	15,130	26,267
Sub-total	47,496	83,216
Valuation allowance	(3,194)	(2,819)
Total deferred tax assets	44,302	80,397
Deferred tax liabilities:
Difference between book and tax basis of other assets and liabilities	859	1,612
Pension obligations	16,280	9,689
Basis differences in equity method investments	1,269	3,423
Undistributed earnings of foreign subsidiaries	2,571	68,201
Bond redemption costs	2,812	0
Total deferred tax liabilities	23,791	82,925
Total net deferred tax assets (liabilities)	$ 20,511
Total net deferred tax assets (liabilities)		$ (2,528)