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Business Segments (Schedule Of Depreciation And Amortization, Capital Expenditures) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Capital Expenditures	$ 26,446	$ 36,875	$ 27,361
Operating Segments
Segment Reporting Information [Line Items]
Depreciation and Amortization	27,683	26,402	23,784
Capital Expenditures	26,446	36,875	27,361
PE Films | Operating Segments
Segment Reporting Information [Line Items]
Depreciation and Amortization	6,522	6,280	6,263
Capital Expenditures	1,772	3,289	2,997
Aluminum Extrusions | Operating Segments
Segment Reporting Information [Line Items]
Depreciation and Amortization	17,927	17,414	15,326
Capital Expenditures	20,339	23,664	18,914
Subtotal | Operating Segments
Segment Reporting Information [Line Items]
Depreciation and Amortization	27,314	26,138	23,577
Capital Expenditures	26,434	35,104	27,514
General corporate | Operating Segments
Segment Reporting Information [Line Items]
Depreciation and Amortization	369	264	207
Capital Expenditures	12	1,771	(153)
Flexible Packaging Films | Operating Segments
Segment Reporting Information [Line Items]
Depreciation and Amortization	2,865	2,444	1,988
Capital Expenditures	$ 4,323	$ 8,151	$ 5,603

X

- Definition

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
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482099/360-10-50-1

Reference 3: 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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- Definition

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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-URI https://asc.fasb.org//1943274/2147482740/230-10-45-13

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- Definition

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+ References

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