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Accumulated Other Comprehensive Income (Loss) (Schedule Of After-Tax Changes In Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Selling, general and administrative $ 23,864 $ 20,946 $ 45,875 $ 42,775
Beginning of Period     (179,987) (176,669)
Other comprehensive income (loss) before reclassifications     (1,501) (9,734)
Amounts reclassified from accumulated other comprehensive income (loss)     5,644 4,862
Net other comprehensive income (loss) - current period 3,207 (9,105) 4,143 (4,872)
End of Period (175,844) (181,541) (175,844) (181,541)
Income before income taxes 18,917 19,269 42,728 42,721
Income Tax Expense (Benefit) 4,440 4,547 8,467 9,834
Net income 14,477 14,722 34,261 32,887
Foreign Currency Translation        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning of Period     (96,940) (86,178)
Other comprehensive income (loss) before reclassifications     (283) (8,905)
Amounts reclassified from accumulated other comprehensive income (loss)     0 0
Net other comprehensive income (loss) - current period     (283) (8,905)
End of Period (97,223) (95,083) (97,223) (95,083)
Gain (Loss) on Derivative Financial Instruments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning of Period     (1,601) 459
Other comprehensive income (loss) before reclassifications     (1,218) (829)
Amounts reclassified from accumulated other comprehensive income (loss)     1,486 (361)
Net other comprehensive income (loss) - current period     268 (1,190)
End of Period (1,333) (731) (1,333) (731)
Pension & Other Post-retirement Benefit Adjustment        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning of Period     (81,446) (90,950)
Other comprehensive income (loss) before reclassifications     0 0
Amounts reclassified from accumulated other comprehensive income (loss)     4,158 5,223
Net other comprehensive income (loss) - current period     4,158 5,223
End of Period (77,288) (85,727) (77,288) (85,727)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gain (Loss) on Derivative Financial Instruments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Income before income taxes (959) 350 (1,752) 556
Income Tax Expense (Benefit) (131) 142 (266) 195
Net income (828) 208 (1,486) 361
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) (593) (761) (1,185) (1,523)
Net income (2,079) (2,611) (4,158) (5,223)
Amortization Of Prior Service Costs And Net Gains Loss (2,672) (3,372) (5,343) (6,746)
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 (606) 712 1,223 (944)
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 $ 16 $ 16 $ 31 $ 31