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Business Segments (Schedule Of Net Sales By Product Group) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue from External Customer [Line Items]
Net Sales by Product Group	$ 577,014	$ 551,566	$ 735,443
Cash and cash equivalents	7,062	9,660
Foreign Country
Revenue from External Customer [Line Items]
Cash and cash equivalents	1,600	800
PE Films
Revenue from External Customer [Line Items]
Net Sales by Product Group	105,199	76,763	97,571
Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	471,815	474,803	637,872
Surface protection films | PE Films
Revenue from External Customer [Line Items]
Net Sales by Product Group	75,909	47,463	68,140
Subtotal | PE Films
Revenue from External Customer [Line Items]
Net Sales by Product Group	105,199	76,763	97,571
Nonresidential building & construction | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	265,496	273,648	350,377
Consumer durables | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	31,911	37,257	60,252
Residential building & construction | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	36,303	36,774	61,815
Machinery and Equipment | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	51,149	41,908	57,795
Automotive | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	39,283	46,014	49,330
Distribution | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	11,750	13,719	28,533
Electrical | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	35,923	25,483	29,770
Subtotal | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	471,815	474,803	637,872
Overwrap Packaging | PE Films
Revenue from External Customer [Line Items]
Net Sales by Product Group	$ 29,290	$ 29,300	$ 29,431

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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