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BUSINESS SEGMENTS - Schedule Of Net Sales By Product Group (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenue from External Customer [Line Items]
Total	$ 172,963	$ 148,610	$ 332,133	$ 287,568
Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	148,367	119,413	281,999	233,636
PE Films
Revenue from External Customer [Line Items]
Total	24,596	29,197	50,134	53,932
Nonresidential building & construction | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	81,625	69,388	149,223	137,616
Consumer durables | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	12,751	8,559	24,418	16,230
Automotive | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	11,069	9,715	22,067	19,904
Residential building & construction | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	10,025	9,481	19,023	17,072
Electrical | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	12,522	6,927	27,863	12,534
Machinery & equipment | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	15,998	12,154	31,281	23,870
Distribution | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	4,377	3,189	8,124	6,410
Subtotal | Aluminum Extrusions
Revenue from External Customer [Line Items]
Total	148,367	119,413	281,999	233,636
Surface protection films | PE Films
Revenue from External Customer [Line Items]
Total	16,741	21,713	35,512	38,725
Overwrap packaging | PE Films
Revenue from External Customer [Line Items]
Total	7,855	7,484	14,622	15,207
Subtotal | PE Films
Revenue from External Customer [Line Items]
Total	$ 24,596	$ 29,197	$ 50,134	$ 53,932

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