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Business Segments (Schedule Of Depreciation And Amortization, Capital Expenditures) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Capital Expenditures | $ 14,347 | $ 26,446 | $ 36,875
Amortization of identifiable intangibles | 2,313 | 2,865 | 2,444
Capital Expenditure, Discontinued Operations | 2,489 | 4,323 | 8,151
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and Amortization | 25,537 | 27,683 | 26,402
Capital Expenditures | 14,347 | 26,446 | 36,875
PE Films | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and Amortization | 5,200 | 6,522 | 6,280
Capital Expenditures | 1,761 | 1,772 | 3,289
Aluminum Extrusions | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and Amortization | 17,722 | 17,927 | 17,414
Capital Expenditures | 10,097 | 20,339 | 23,664
Subtotal |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and Amortization | 22,922 | 24,449 | 23,694
Subtotal | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and Amortization | 22,922 | 24,449 | 23,694
Capital Expenditures | 11,858 | 22,111 | 26,953
General corporate | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and Amortization | 302 | 369 | 264
Capital Expenditures | $ 0 | $ 12 | $ 1,771

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