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Business Segments (Schedule Of Depreciation And Amortization, Capital Expenditures) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |
Depreciation and Amortization | $ 26,402 | $ 23,784 | $ 31,957
Capital Expenditures | 36,875 | 27,361 | 23,355
Depreciation and Amortization, Discontinued Operations | 0 | 0 | 5,511
Capital Expenditure, Discontinued Operations | 0 | 0 | 1,912
PE Films |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and Amortization | 6,280 | 6,263 | 6,762
Capital Expenditures | 3,289 | 2,997 | 6,024
Aluminum Extrusions |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and Amortization | 17,414 | 15,326 | 17,403
Capital Expenditures | 23,664 | 18,914 | 10,260
Subtotal |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and Amortization | 26,138 | 23,577 | 25,926
Capital Expenditures | 35,104 | 27,514 | 21,243
General corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and Amortization | 264 | 207 | 520
Capital Expenditures | 1,771 | (153) | 200
Flexible Packaging Films |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and Amortization | 2,444 | 1,988 | 1,761
Capital Expenditures | $ 8,151 | $ 5,603 | $ 4,959

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