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Business Segments (Schedule Of Identifiable Assets) (Details) - USD ($) $ in Thousands		Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Revenue from External Customer [Line Items]
Identifiable Assets, Total	[1]	$ 514,870		$ 712,668
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		11,846	[1]	31,422	[1]	$ 34,397
Disposal Group, Including Discontinued Operation, Assets		1,490		108,279
PE Films [Member]
Revenue from External Customer [Line Items]
Identifiable Assets, Total		119,013		124,269
Flexible Packaging Films [Member] [Domain]
Revenue from External Customer [Line Items]
Identifiable Assets, Total		66,453		74,016
General Corporate
Revenue from External Customer [Line Items]
Identifiable Assets, Total	[1]	71,508		109,655
Subtotal
Revenue from External Customer [Line Items]
Identifiable Assets, Total		430,026		463,312
Aluminum Extrusions
Revenue from External Customer [Line Items]
Identifiable Assets, Total		$ 244,560		$ 265,027
[1] Cash and cash equivalents includes funds held in locations outside the U.S. of $9.4 million and $8.9 million at December 31, 2020 and 2019, respectively. (c)Information on exports and foreign operations are provided on the previous page. Export sales relate almost entirely to PE Films. Operations in China relate to PE Films. Operations in Brazil relate to Flexible Packaging Films.

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