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Business Segments (Schedule Of Depreciation And Amortization, Capital Expenditures) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Depreciation and Amortization	$ 40,277	$ 32,472	$ 34,982
Capital Expenditures	44,362	45,457	32,831
PE Films [Member]
Segment Reporting Information [Line Items]
Depreciation and Amortization	14,609	13,653	15,480
Capital Expenditures	15,029	25,759	21,218
Flexible Packaging Films [Member] [Domain]
Segment Reporting Information [Line Items]
Depreciation and Amortization	10,443	9,505	9,697
Capital Expenditures	3,619	3,391	3,489
Aluminum Extrusions
Segment Reporting Information [Line Items]
Depreciation and Amortization	15,070	9,173	9,698
Capital Expenditures	25,653	15,918	8,124
Subtotal
Segment Reporting Information [Line Items]
Depreciation and Amortization	40,122	32,331	34,875
Capital Expenditures	44,301	45,068	32,831
General Corporate
Segment Reporting Information [Line Items]
Depreciation and Amortization	155	141	107
Capital Expenditures	$ 61	$ 389	$ 0

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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

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- 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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