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Segment Reporting (Schedule Of Identifiable Assets By Segment) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Subtotal | $ 458,499 | $ 430,026 |  |
General corporate | 56,780 | 71,508 |  |
Cash, cash equivalents, and restricted cash at beginning of period | 30,253 | 11,846 | $ 35,022 | $ 31,422
Disposal Group, Including Discontinued Operation, Assets | 302 | 1,490 |  |
Total assets | 545,834 | 514,870 |  |
PE Films [Member] |  |  |  |
Total assets | 111,690 | 119,013 |  |
Flexible Packaging Films [Member] [Domain] |  |  |  |
Total assets | 72,626 | 66,453 |  |
Aluminum Extrusions [Member] |  |  |  |
Total assets | $ 274,183 | $ 244,560 |  |

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