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Goodwill And Other Intangible Assets (Schedule Of Goodwill And Other Intangibles) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Goodwill And Other Intangible Assets [Line Items]      
Goodwill $ 22,446 $ 35,717 $ 70,608
Goodwill impairment (13,271) (34,891) 0
Aluminum Extrusions      
Goodwill And Other Intangible Assets [Line Items]      
Goodwill 0 13,271 13,271
Goodwill impairment 13,271 0  
PE Films      
Goodwill And Other Intangible Assets [Line Items]      
Goodwill 22,446 22,446 $ 57,337
Goodwill impairment $ 0 $ 34,891