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Summary of Significant Accounting Policies (Schedule of Reclassifications Out of AOCI) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Cost of Goods and Services Sold $ 558,967 $ 641,140 $ 679,665
Income tax expense (benefit) [1] (8,213) 13,545 18,807
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax 25,295    
Gain (loss) on derivative financial instruments | Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total, before taxes (8,724) (3,578) (665)
Income tax expense (benefit) (1,868) (598) 253
Total, net of tax (6,856) (2,980) (918)
Pension and other post-retirement benefit adjustments | Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Actuarial gain (loss) and prior service costs, before taxes (15,296) (10,632) (13,650)
Income tax expense (benefit) (3,937) (2,359) (3,028)
Total, net of tax (11,359) (8,273) (10,622)
Foreign Currency Translation      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax 25,295    
Foreign Currency Translation | Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax (25,295)    
Aluminum Futures Contracts | Gain (loss) on derivative financial instruments | Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Cost of Goods and Services Sold 2,717 2,736 (1,069)
Foreign Currency Forward Contracts | Gain (loss) on derivative financial instruments | Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Cost of Goods and Services Sold (62) (62) 62
Selling, General and Administrative Expenses [Member] | Foreign Currency Forward Contracts | Gain (loss) on derivative financial instruments | Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Cost of Goods and Services Sold $ (6,069) $ (904) $ (1,796)
[1] See Notes 1, 2, 3, 4 and 17 for more information on losses associated with plant shutdowns, asset impairments and restructurings, unusual items, gains or losses from sale of assets, gains or losses on an investment accounted for under the fair value method and other items.