Accumulated Other Comprehensive Income (Loss) (Schedule Of After-Tax Changes In Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Selling, general and administrative	$ 20,420	$ 19,154	$ 61,654	$ 56,399
Beginning of Period			(197,651)	(179,987)
Other comprehensive income (loss) before reclassifications			(16,936)	(9,356)
Amounts reclassified from accumulated other comprehensive income (loss)			14,349	8,445
Net other comprehensive income (loss) - current period	6,071	(5,054)	(2,587)	(911)
End of Period	(200,238)	(180,898)	(200,238)	(180,898)
Income (loss) from continuing operations before income taxes	(22,918)	15,229	(31,616)	68,021
Income Tax Expense (Benefit)	(5,942)	177	(8,308)	10,550
Net loss	(65,213)	17,133	(76,339)	51,395
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of Period			(100,663)	(96,940)
Other comprehensive income (loss) before reclassifications			(11,076)	(6,291)
Amounts reclassified from accumulated other comprehensive income (loss)			0	0
Net other comprehensive income (loss) - current period			(11,076)	(6,291)
End of Period	(111,739)	(103,231)	(111,739)	(103,231)
Gain (Loss) on Derivative Financial Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of Period			(1,307)	(1,601)
Other comprehensive income (loss) before reclassifications			(5,860)	(3,065)
Amounts reclassified from accumulated other comprehensive income (loss)			5,556	2,209
Net other comprehensive income (loss) - current period			(304)	(856)
End of Period	(1,611)	(2,457)	(1,611)	(2,457)
Pension & Other Post-retirement Benefit Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning of Period			(95,681)	(81,446)
Other comprehensive income (loss) before reclassifications			0	0
Amounts reclassified from accumulated other comprehensive income (loss)			8,793	6,236
Net other comprehensive income (loss) - current period			8,793	6,236
End of Period	(86,888)	(75,210)	(86,888)	(75,210)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gain (Loss) on Derivative Financial Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income (loss) from continuing operations before income taxes	(2,327)	(902)	(7,079)	(2,654)
Income Tax Expense (Benefit)	(496)	(179)	(1,523)	(445)
Net loss	(1,831)	(723)	(5,556)	(2,209)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Pension & Other Post-retirement Benefit Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income Tax Expense (Benefit)	(836)	(593)	(2,507)	(1,778)
Net loss	(2,931)	(2,079)	(8,793)	(6,236)
Amortization Of Prior Service Costs And Net Gains Loss	(3,767)	(2,672)	(11,300)	(8,014)
Aluminum Futures Contracts [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Gain (Loss) on Derivative Financial Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of goods sold	(575)	(816)	(2,766)	(2,039)
Cost of Sales [Member] | Foreign Currency Forward Contracts [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Gain (Loss) on Derivative Financial Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of goods sold	$ 15	$ 15	$ 46	$ 46