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Business Segments (Schedule Of Net Sales By Product Group) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue from External Customer [Line Items]
Net Sales by Product Group	$ 677,892	$ 903,582	$ 798,223
Cash and cash equivalents	9,660	19,232
Foreign Country
Revenue from External Customer [Line Items]
Cash and cash equivalents	9,800	10,300
PE Films
Revenue from External Customer [Line Items]
Net Sales by Product Group	76,763	97,571	118,920
Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	474,803	637,872	539,325
Flexible Packaging Films
Revenue from External Customer [Line Items]
Net Sales by Product Group	126,326	168,139	139,978
Personal Care Materials | PE Films
Revenue from External Customer [Line Items]
Net Sales by Product Group	29,300	29,431	30,484
Surface protection films | PE Films
Revenue from External Customer [Line Items]
Net Sales by Product Group	47,463	68,140	88,436
Subtotal | PE Films
Revenue from External Customer [Line Items]
Net Sales by Product Group	76,763	97,571	118,920
Nonresidential building & construction | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	264,780	338,981	269,252
Consumer durables | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	38,897	62,541	53,578
Residential building & construction | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	38,388	64,268	52,236
Machinery and Equipment | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	43,759	63,326	42,721
Automotive | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	48,046	51,286	43,256
Distribution | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	14,331	29,732	45,639
Electrical | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	26,602	27,738	32,643
Subtotal | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	$ 474,803	$ 637,872	$ 539,325

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