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BUSINESS SEGMENTS - Schedule Of Net Sales By Product Group (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Revenue from External Customer [Line Items]
Total	$ 180,990	$ 159,172
Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	159,457	133,635
High Performance Films
Revenue from External Customer [Line Items]
Total	21,533	25,537
Nonresidential building & construction | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	81,188	67,601
Consumer durables | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	13,322	11,667
Automotive | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	11,592	10,998
Residential building & construction | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	11,940	8,998
Electrical | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	10,980	15,341
Machinery & equipment | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	25,471	15,283
Distribution | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	4,964	3,747
Subtotal | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	159,457	133,635
Surface protection films | High Performance Films
Revenue from External Customer [Line Items]
Total	14,200	18,770
Advanced packaging | High Performance Films
Revenue from External Customer [Line Items]
Total	7,333	6,767
Subtotal | High Performance Films
Revenue from External Customer [Line Items]
Total	$ 21,533	$ 25,537

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