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Business Segments (Schedule Of Depreciation And Amortization, Capital Expenditures) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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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/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 + Details
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- 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 + Details
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