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Business Segments (Schedule Of Depreciation And Amortization, Capital Expenditures) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Depreciation and Amortization	$ 44,284	$ 33,804	$ 40,277
Capital Expenditures	50,864	40,814	44,362
PE Films [Member]
Segment Reporting Information [Line Items]
Depreciation and Amortization	15,822	15,513	14,609
Capital Expenditures	23,920	21,998	15,029
Flexible Packaging Films [Member] [Domain]
Segment Reporting Information [Line Items]
Depreciation and Amortization	1,517	1,262	10,443
Capital Expenditures	8,866	5,423	3,619
Aluminum Extrusions
Segment Reporting Information [Line Items]
Depreciation and Amortization	26,759	16,866	15,070
Capital Expenditures	17,855	12,966	25,653
Subtotal
Segment Reporting Information [Line Items]
Depreciation and Amortization	44,098	33,641	40,122
Capital Expenditures	50,641	40,387	44,301
General Corporate
Segment Reporting Information [Line Items]
Depreciation and Amortization	186	163	155
Capital Expenditures	$ 223	$ 427	$ 61

X

- 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
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

+ Details

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X

- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585

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X

- Definition

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

No definition available.

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