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Goodwill And Other Intangible Assets (Schedule Of Goodwill And Other Intangibles) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Goodwill And Other Intangible Assets [Line Items]      
Goodwill, Impairment Loss $ 0 $ 13,696 $ 0
Goodwill 70,608 67,708 81,404
Goodwill, Purchase Accounting Adjustments (2,900)    
Finite-Lived Intangible Assets, Net 14,152    
Identifiable intangible assets:      
Total carrying value of identifiable intangibles 14,152 18,820  
Intangible Assets, Net (Including Goodwill) 84,760 86,528  
Goodwill, Impairment Loss, Net of Tax   10,500  
Customer relationships      
Goodwill And Other Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 13,259 17,551  
Identifiable intangible assets:      
Finite-Lived Intangible Assets, Gross 26,526 29,450  
Proprietary technology      
Goodwill And Other Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 118 194  
Identifiable intangible assets:      
Finite-Lived Intangible Assets, Gross 3,721 3,726  
Trade Names [Member]      
Goodwill And Other Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 775 1,075  
Identifiable intangible assets:      
Finite-Lived Intangible Assets, Gross 13,338 13,397  
Aluminum Extrusions      
Goodwill And Other Intangible Assets [Line Items]      
Goodwill, Impairment Loss 0 13,696 0
Goodwill 13,270 10,370 24,066
Reclassification from customer relationship intangibles to goodwill (2,900)    
Finite-Lived Intangible Assets, Net 12,987 17,199 19,699
Aluminum Extrusions | Customer relationships      
Goodwill And Other Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 12,972 17,164 19,644
Aluminum Extrusions | Proprietary technology      
Goodwill And Other Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 15 35 55
Aluminum Extrusions | Trade Names [Member]      
Goodwill And Other Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 0 0 0
PE Films [Member]      
Goodwill And Other Intangible Assets [Line Items]      
Goodwill, Impairment Loss 0 0  
Goodwill 57,338 57,338 57,338
Finite-Lived Intangible Assets, Net 0 0 610
PE Films [Member] | Customer relationships      
Goodwill And Other Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 0 0 0
PE Films [Member] | Proprietary technology      
Goodwill And Other Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net 0 0 610
PE Films [Member] | Trade Names [Member]      
Goodwill And Other Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net $ 0 $ 0 $ 0