Significant Accounting Policies (Changes In Accumulated Other Comprehensive Income By Components) (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	$ (87,652)	$ (72,181)
Other comprehensive income (loss) before reclassifications	(21,092)	28,286
Amount reclassified from accumulated other comprehensive income (loss)	13,800	(43,757)
Net current-period other comprehensive income (loss)	(7,941)	(14,723)	$ (1,797)
Ending balance	(94,944)	(87,652)	(72,181)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent		(15,471)
Components of accumulated other comprehensive income loss, tax	(7,292)	(15,471)
Unrealized gains (losses) on derivative instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(6,963)	15,261
Other comprehensive income (loss) before reclassifications	(5,357)	25,306
Amount reclassified from accumulated other comprehensive income (loss)	9,162	(47,530)
Net current-period other comprehensive income (loss)	3,805	(22,224)
Ending balance	(3,158)	(6,963)	15,261
Unrealized gains (losses) on available-for-sale marketable securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	11	17
Other comprehensive income (loss) before reclassifications	0	0
Amount reclassified from accumulated other comprehensive income (loss)	(11)	(6)
Net current-period other comprehensive income (loss)	(11)	(6)
Ending balance	0	11	17
Pension and post-retirement benefit plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(47,469)	(46,807)
Other comprehensive income (loss) before reclassifications	3,321	(4,441)
Amount reclassified from accumulated other comprehensive income (loss)	4,649	3,779
Net current-period other comprehensive income (loss)	7,970	(662)
Ending balance	(39,499)	(47,469)	(46,807)
Foreign currency translation differences
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(33,231)	(40,652)
Other comprehensive income (loss) before reclassifications	(19,056)	7,421
Amount reclassified from accumulated other comprehensive income (loss)	0	0
Net current-period other comprehensive income (loss)	(19,056)	7,421
Ending balance	$ (52,287)	$ (33,231)	$ (40,652)

Components Of Accumulated Other Comprehensive Income Loss Tax

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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