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Segment Reporting (Schedule Of Identifiable Assets By Segment) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Subtotal | $ 469,781 | $ 461,179 |  |
General corporate | 16,882 | 111,788 |  |
Cash, cash equivalents, and restricted cash at beginning of period | 35,022 | 31,422 | $ 44,652 | $ 34,397
Disposal Group, Including Discontinued Operation, Assets | 45,955 | 108,279 |  |
Total assets | 567,640 | 712,668 |  |
PE Films |  |  |  |
Total assets | 169,195 | 122,136 |  |
Flexible Packaging Films [Member] [Domain] |  |  |  |
Total assets | 61,903 | 74,016 |  |
Aluminum Extrusions [Member] |  |  |  |
Total assets | $ 238,683 | $ 265,027 |  |

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