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BUSINESS SEGMENTS - Schedule Of Net Sales By Product Group (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenue from External Customer [Line Items]
Total	$ 159,172	$ 138,957
Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	133,635	114,222
PE Films
Revenue from External Customer [Line Items]
Total	25,537	24,735
Nonresidential building & construction | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	67,601	68,228
Consumer durables | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	11,667	7,670
Automotive | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	10,998	10,189
Residential building & construction | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	8,998	7,591
Electrical | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	15,341	5,607
Machinery & equipment | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	15,283	11,716
Distribution | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	3,747	3,221
Subtotal | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	133,635	114,222
Surface protection films | PE Films
Revenue from External Customer [Line Items]
Total	18,770	17,011
Overwrap packaging | PE Films
Revenue from External Customer [Line Items]
Total	6,767	7,724
Subtotal | PE Films
Revenue from External Customer [Line Items]
Total	$ 25,537	$ 24,735

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