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Business Segments (Schedule Of Net Sales By Product Group) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | $ 903,582 | $ 798,223 | $ 729,604
Cash and cash equivalents | 19,232 | 30,521 |
Foreign Country |  |  |
Revenue from External Customer [Line Items] |  |  |
Cash and cash equivalents | 10,300 | 16,400 |
PE Films |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 97,571 | 118,920 | 139,288
Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 637,872 | 539,325 | 455,711
Flexible Packaging Films |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 168,139 | 139,978 | 134,605
Personal Care Materials | PE Films |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 29,431 | 30,484 | 22,700
Surface protection films | PE Films |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 68,140 | 88,436 | 109,097
LED lighting products & other films | PE Films |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 0 | 0 | 7,491
Subtotal | PE Films |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 97,571 | 118,920 | 139,288
Nonresidential building & construction | Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 338,981 | 269,252 | 253,126
Consumer durables | Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 62,541 | 53,578 | 44,167
Residential building & construction | Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 64,268 | 52,236 | 40,049
Machinery and Equipment | Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 63,326 | 42,721 | 30,649
Automotive | Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 51,286 | 43,256 | 35,895
Distribution | Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 29,732 | 45,639 | 28,339
Electrical | Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | 27,738 | 32,643 | 23,486
Subtotal | Aluminum Extrusions |  |  |
Revenue from External Customer [Line Items] |  |  |
Net Sales by Product Group | $ 637,872 | $ 539,325 | $ 455,711

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