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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, 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

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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=98514028&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 -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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