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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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