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Business Segments (Schedule Of Depreciation And Amortization, Capital Expenditures) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Depreciation and Amortization	$ 33,804	$ 40,277	$ 32,472
Capital Expenditures	40,814	44,362	45,457
PE Films [Member]
Segment Reporting Information [Line Items]
Depreciation and Amortization	15,513	14,609	13,653
Capital Expenditures	21,998	15,029	25,759
Flexible Packaging Films [Member] [Domain]
Segment Reporting Information [Line Items]
Depreciation and Amortization	1,262	10,443	9,505
Capital Expenditures	5,423	3,619	3,391
Aluminum Extrusions
Segment Reporting Information [Line Items]
Depreciation and Amortization	16,866	15,070	9,173
Capital Expenditures	12,966	25,653	15,918
Subtotal
Segment Reporting Information [Line Items]
Depreciation and Amortization	33,641	40,122	32,331
Capital Expenditures	40,387	44,301	45,068
General Corporate
Segment Reporting Information [Line Items]
Depreciation and Amortization	163	155	141
Capital Expenditures	$ 427	$ 61	$ 389

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=109223946&loc=d3e3602-108585

+ Details

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Balance Type:	debit
Period Type:	duration

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=109223946&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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