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Business Segments (Schedule Of Depreciation And Amortization, Capital Expenditures) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Depreciation and Amortization	$ 31,957	$ 44,284	$ 33,804
Capital Expenditures	23,355	50,864	40,814
Capital Expenditure, Discontinued Operations	1,912	15,353	19,475
PE Films [Member]
Segment Reporting Information [Line Items]
Depreciation and Amortization	6,762	5,860	6,201
Capital Expenditures	6,024	8,567	2,523
Flexible Packaging Films [Member] [Domain]
Segment Reporting Information [Line Items]
Depreciation and Amortization	1,761	1,517	1,262
Capital Expenditures	4,959	8,866	5,423
Aluminum Extrusions
Segment Reporting Information [Line Items]
Depreciation and Amortization	17,403	26,759	16,866
Capital Expenditures	10,260	17,855	12,966
Subtotal
Segment Reporting Information [Line Items]
Depreciation and Amortization	25,926	34,136	24,329
Capital Expenditures	21,243	35,288	20,912
General Corporate
Segment Reporting Information [Line Items]
Depreciation and Amortization	520	186	163
Capital Expenditures	$ 200	$ 223	$ 427

X

- Definition

Amount of capital expenditure attributable to discontinued operations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760

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- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 28
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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
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-Topic 230
-SubTopic 10
-Section 45
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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