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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, 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

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