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Business Segments (Schedule Of Depreciation And Amortization, Capital Expenditures) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Depreciation and Amortization	$ 32,472	$ 34,982	$ 40,818
Capital Expenditures	45,457	32,831	44,898
PE Films [Member]
Segment Reporting Information [Line Items]
Depreciation and Amortization	13,653	15,480	21,399
Capital Expenditures	25,759	21,218	17,000
Flexible Packaging Films [Member] [Domain]
Segment Reporting Information [Line Items]
Depreciation and Amortization	9,505	9,697	9,331
Capital Expenditures	3,391	3,489	21,806
Aluminum Extrusions
Segment Reporting Information [Line Items]
Depreciation and Amortization	9,173	9,698	9,974
Capital Expenditures	15,918	8,124	6,092
Subtotal
Segment Reporting Information [Line Items]
Depreciation and Amortization	32,331	34,875	40,704
Capital Expenditures	45,068	32,831	44,898
General Corporate
Segment Reporting Information [Line Items]
Depreciation and Amortization	141	107	114
Capital Expenditures	$ 389	$ 0	$ 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=66902209&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
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: 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=66902209&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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