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Goodwill And Other Intangible Assets (Schedule Of Goodwill And Other Intangibles) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 35,717	$ 70,608	$ 70,608
Goodwill impairment	(34,891)	0	0
Aluminum Extrusions
Goodwill And Other Intangible Assets [Line Items]
Goodwill	13,270	13,270	13,270
Goodwill impairment	0
PE Films
Goodwill And Other Intangible Assets [Line Items]
Goodwill	22,447	$ 57,338	$ 57,338
Goodwill impairment	$ (34,891)

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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