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Business Segments (Schedule Of Net Sales By Product Group) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenue from External Customer [Line Items]      
Net Sales by Product Group [1] $ 798,223 $ 729,604 $ 797,344
PE Films [Member]      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 118,920 139,288 133,807
Flexible Packaging Films [Member] [Domain]      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 139,978 134,605 133,935
Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 539,325 455,711 529,602
Personal Care Materials [Member] | PE Films [Member]      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 30,484 22,700 22,542
Surface protection films | PE Films [Member]      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 88,436 109,097 103,893
LED lighting products & other films | PE Films [Member]      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 0 7,491 7,372
Subtotal | PE Films [Member]      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 118,920 139,288 133,807
Nonresidential building & construction | Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 269,252 253,126 272,729
Consumer durables | Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 53,578 44,167 57,607
Residential building & construction | Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 52,236 40,049 43,554
Machinery and Equipment | Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 42,721 30,649 38,657
Automotive | Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 43,256 35,895 46,461
Distribution | Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 45,639 28,339 34,753
Electrical | Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group 32,643 23,486 35,841
Subtotal | Aluminum Extrusions      
Revenue from External Customer [Line Items]      
Net Sales by Product Group $ 539,325 $ 455,711 $ 529,602
[1] Cash and cash equivalents includes funds held in locations outside the U.S. of $16.4 million and $9.4 million at December 31, 2021 and 2020, respectively. (c)Information on exports and foreign operations are provided on the previous page. Export sales relate almost entirely to PE Films. Operations in China relate to PE Films. Operations in Brazil relate to Flexible Packaging Films.