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BUSINESS SEGMENTS - Schedule of Depreciation and Amortization, Capital Expenditures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Depreciation and amortization
Depreciation and amortization	$ 5,248	$ 5,475
Capital expenditures
Capital expenditures	5,141	2,957
Operating Segments
Depreciation and amortization
Depreciation and amortization	5,296	5,526
Capital expenditures
Capital expenditures	5,141	2,957
Aluminum Extrusions | Operating Segments
Depreciation and amortization
Depreciation and amortization	4,045	4,225
Capital expenditures
Capital expenditures	4,689	2,370
High Performance Films | Operating Segments
Depreciation and amortization
Depreciation and amortization	1,203	1,250
Capital expenditures
Capital expenditures	452	587
Subtotal | Operating Segments
Depreciation and amortization
Depreciation and amortization	5,248	5,475
General corporate | Operating Segments
Depreciation and amortization
Depreciation and amortization	$ 48	$ 51

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Amount of expense charged against earnings to allocate the cost of tangible and intangible assets over their remaining economic lives, classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

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-Name Accounting Standards Codification
-Topic 360
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-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
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-Section 45
-Paragraph 13
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