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Segment Reporting (Schedule Of Identifiable Assets By Segment) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Assets	$ 442,541	$ 446,461
Cash and cash equivalents	6,588	13,455	$ 48,604	$ 19,232
Operating Segments
Assets	442,540	446,461
Aluminum Extrusions [Member] | Operating Segments
Assets	258,410	255,756
PE Films [Member] | Operating Segments
Assets	57,989	56,536
Flexible Packaging Films [Member] | Operating Segments
Assets	85,297	84,062
Subtotal | Operating Segments
Assets	401,696	396,354
General Corporate | Operating Segments
Assets	$ 34,256	$ 36,652

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