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Segment Reporting (Schedule Of Identifiable Assets By Segment) (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Assets	$ 450,412	$ 446,461
Cash and cash equivalents	8,669	13,455	$ 21,193	$ 19,232
Operating Segments
Assets	450,412	446,461
Aluminum Extrusions [Member] | Operating Segments
Assets	269,068	255,756
PE Films [Member] | Operating Segments
Assets	59,541	56,536
Flexible Packaging Films [Member] | Operating Segments
Assets	80,650	84,062
Subtotal | Operating Segments
Assets	409,259	396,354
General Corporate | Operating Segments
Assets	$ 32,484	$ 36,652

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