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Business Segments (Schedule Of Identifiable Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue from External Customer [Line Items]
Total assets	$ 542,093	$ 523,584
Cash and cash equivalents	19,232	30,521	$ 11,846	$ 31,422
Discontinued operations	0	178
PE Films
Revenue from External Customer [Line Items]
Total assets	102,431	113,613
General corporate
Revenue from External Customer [Line Items]
Total assets	23,674	23,482
Subtotal
Revenue from External Customer [Line Items]
Total assets	499,187	469,403
Aluminum Extrusions
Revenue from External Customer [Line Items]
Total assets	293,308	280,521
Flexible Packaging Films
Revenue from External Customer [Line Items]
Total assets	$ 103,448	$ 75,269

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