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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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