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Segment Reporting (Schedule Of Identifiable Assets By Segment) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Subtotal	$ 458,377	$ 430,026
General corporate	58,538	71,508
Cash, cash equivalents, and restricted cash at beginning of period	18,298	11,846	$ 39,930	$ 31,422
Disposal Group, Including Discontinued Operation, Assets	302	1,490
Total assets	535,515	514,870
PE Films [Member]
Total assets	114,530	119,013
Flexible Packaging Films [Member] [Domain]
Total assets	76,411	66,453
Aluminum Extrusions [Member]
Total assets	$ 267,436	$ 244,560

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