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Business Segments (Schedule Of Net Sales By Product Group) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue from External Customer [Line Items]
Net Sales by Product Group	$ 903,582	$ 798,223	$ 729,604
Cash and cash equivalents	19,232	30,521
Foreign Country
Revenue from External Customer [Line Items]
Cash and cash equivalents	10,300	16,400
PE Films
Revenue from External Customer [Line Items]
Net Sales by Product Group	97,571	118,920	139,288
Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	637,872	539,325	455,711
Flexible Packaging Films
Revenue from External Customer [Line Items]
Net Sales by Product Group	168,139	139,978	134,605
Personal Care Materials | PE Films
Revenue from External Customer [Line Items]
Net Sales by Product Group	29,431	30,484	22,700
Surface protection films | PE Films
Revenue from External Customer [Line Items]
Net Sales by Product Group	68,140	88,436	109,097
LED lighting products & other films | PE Films
Revenue from External Customer [Line Items]
Net Sales by Product Group	0	0	7,491
Subtotal | PE Films
Revenue from External Customer [Line Items]
Net Sales by Product Group	97,571	118,920	139,288
Nonresidential building & construction | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	338,981	269,252	253,126
Consumer durables | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	62,541	53,578	44,167
Residential building & construction | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	64,268	52,236	40,049
Machinery and Equipment | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	63,326	42,721	30,649
Automotive | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	51,286	43,256	35,895
Distribution | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	29,732	45,639	28,339
Electrical | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	27,738	32,643	23,486
Subtotal | Aluminum Extrusions
Revenue from External Customer [Line Items]
Net Sales by Product Group	$ 637,872	$ 539,325	$ 455,711

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