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Segment Reporting (Schedule Of Identifiable Assets By Segment) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Subtotal | $ 432,632 | $ 430,026 |  |
General corporate | 64,577 | 71,508 |  |
Cash, cash equivalents, and restricted cash at beginning of period | 21,859 | 11,846 | $ 35,059 | $ 31,422
Disposal Group, Including Discontinued Operation, Assets | 3,436 | 1,490 |  |
Total assets | 522,504 | 514,870 |  |
PE Films |  |  |  |
Total assets | 118,755 | 119,013 |  |
Flexible Packaging Films [Member] [Domain] |  |  |  |
Total assets | 59,680 | 66,453 |  |
Aluminum Extrusions [Member] |  |  |  |
Total assets | $ 254,197 | $ 244,560 |  |

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