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BUSINESS SEGMENTS - Schedule Of Net Sales By Product Group (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenue from External Customer [Line Items]
Total	$ 188,353	$ 140,596	$ 520,487	$ 428,164
Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	162,470	115,717	444,470	349,353
PE Films
Revenue from External Customer [Line Items]
Total	25,883	24,879	76,017	78,811
Nonresidential building & construction | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	87,388	63,362	236,612	200,978
Consumer durables | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	13,297	8,210	37,715	24,440
Automotive | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	10,832	10,583	32,899	30,487
Residential building & construction | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	11,516	9,368	30,539	26,440
Electrical | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	14,429	8,541	42,292	21,075
Machinery & equipment | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	17,662	12,564	48,943	36,434
Distribution | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	7,346	3,089	15,470	9,499
Subtotal | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	162,470	115,717	444,470	349,353
Surface protection films | PE Films
Revenue from External Customer [Line Items]
Total	19,163	17,516	54,675	56,241
Overwrap packaging | PE Films
Revenue from External Customer [Line Items]
Total	6,720	7,363	21,342	22,570
Subtotal | PE Films
Revenue from External Customer [Line Items]
Total	$ 25,883	$ 24,879	$ 76,017	$ 78,811

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