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Business Segments (Schedule Of Net Sales By Product Group) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | $ 577,014 | $ 551,566 | $ 735,443
Cash and cash equivalents | 7,062 | 9,660 |
Foreign Country |  |  |
Revenue from External Customer [Line Items] |  |  |
Cash and cash equivalents | 1,600 | 800 |
PE Films |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 105,199 | 76,763 | 97,571
Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 471,815 | 474,803 | 637,872
Surface protection films | PE Films |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 75,909 | 47,463 | 68,140
Subtotal | PE Films |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 105,199 | 76,763 | 97,571
Nonresidential building & construction | Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 265,496 | 273,648 | 350,377
Consumer durables | Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 31,911 | 37,257 | 60,252
Residential building & construction | Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 36,303 | 36,774 | 61,815
Machinery and Equipment | Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 51,149 | 41,908 | 57,795
Automotive | Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 39,283 | 46,014 | 49,330
Distribution | Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 11,750 | 13,719 | 28,533
Electrical | Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 35,923 | 25,483 | 29,770
Subtotal | Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 471,815 | 474,803 | 637,872
Overwrap Packaging | PE Films |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | $ 29,290 | $ 29,300 | $ 29,431

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