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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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