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Segment Reporting (Schedule Of Segment Reporting Information By Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Assets | $ 690,936 |  | $ 690,936 |  | $ 755,743
Total net sales | 257,856 | $ 238,500 | 763,098 | $ 690,654 |
Gross Sales | 267,294 | 247,121 | 789,765 | 715,494 |
Goodwill, Impairment Loss | (46,792) | 0 | (46,792) | 0 |
Total Segment Income (Loss) | (29,960) | 21,482 | 16,830 | 66,593 |
Interest income | 6 | 42 | 290 | 171 |
Interest expense | 1,318 | 1,757 | 4,539 | 4,579 |
Gain (loss) on investment in kaléo accounted for under fair value method |  |  | 11,900 | 24,800 |
Gain (Loss) on Disposition of Assets |  |  | (86) | 412 |
Cost-method Investments, Other than Temporary Impairment | (186) | 0 | (186) |  |
Stock option-based compensation costs | 415 | 111 | 806 | 153 |
Corporate expenses, net | 6,926 | 6,960 | 21,668 | 20,985 |
Income from continuing operations before income taxes | (40,899) | 12,696 | 1,821 | 65,847 |
Income taxes from continuing operations | (6,699) | 4,422 | 3,135 | 9,667 |
Net income | (34,200) | 8,274 | (1,314) | 56,180 |
kaleo |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain (loss) on investment in kaléo accounted for under fair value method | (2,100) | 0 | 11,900 | 24,800 |
PE Films |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Assets | 231,106 |  | 231,106 |  | 289,514
Total net sales | 76,470 | 89,723 | 252,177 | 265,773 |
Operating profit from ongoing operations | 4,145 | 11,251 | 26,857 | 30,965 |
Plant shutdowns, asset impairments, restructurings and other | (2,355) | (919) | (4,542) | (3,890) |
Flexible Packaging Films [Member] [Domain] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Assets | 53,661 |  | 53,661 |  | 49,915
Total net sales | 33,725 | 26,628 | 90,466 | 79,925 |
Operating profit from ongoing operations | 3,609 | (1,074) | 6,617 | (3,392) |
Plant shutdowns, asset impairments, restructurings and other | 0 | 0 | 0 | 11,856 |
Aluminum Extrusions |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Assets | 277,810 |  | 277,810 |  | $ 268,127
Total net sales | 147,661 | 122,149 | 420,455 | 344,956 |
Operating profit from ongoing operations | 11,730 | 12,601 | 35,086 | 34,201 |
Plant shutdowns, asset impairments, restructurings and other | (297) | (377) | (396) | (3,147) |
Alleghany and Bath County, Virginia [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Cost-method Investments, Other than Temporary Impairment |  |  |  | 0 |
Shipping and Handling [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Freight | 9,438 | 8,621 | 26,667 | 24,840 |
Personal Care Materials [Member] | PE Films |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net sales | 57,356 | 63,574 | 174,985 | 187,661 |
Surface Protection Films [Member] | PE Films |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net sales | 17,193 | 24,368 | 71,926 | 72,805 |
Films For Other Markets [Member] | PE Films |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net sales | 1,921 | 1,781 | 5,266 | 5,307 |
Film Products Subtotal [Member] | PE Films |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net sales | 76,470 | 89,723 | 252,177 | 265,773 |
Nonresidential Building And Construction [Member] | Aluminum Extrusions |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net sales | 75,870 | 63,187 | 213,500 | 177,534 |
Consumer Durables [Member] | Aluminum Extrusions |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net sales | 14,991 | 14,105 | 47,300 | 39,871 |
Distribution [Member] | Aluminum Extrusions |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net sales | 9,148 | 7,182 | 32,109 | 23,024 |
Automotive [Member] | Aluminum Extrusions |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net sales | 13,205 | 9,682 | 33,992 | 29,947 |
Residential Building And Construction [Member] | Aluminum Extrusions |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net sales | 11,163 | 10,327 | 32,976 | 29,855 |
Machinery and Equipment BNL [Domain] | Aluminum Extrusions |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net sales | 11,191 | 8,430 | 30,335 | 23,975 |
Electrical [Member] | Aluminum Extrusions |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net sales | 12,093 | 9,236 | 30,243 | 20,750 |
Aluminum Extrusions Subtotal [Member] | Aluminum Extrusions |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net sales | 147,661 | 122,149 | 420,455 | 344,956 |
Product [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Freight | $ 217,378 | $ 194,508 | $ 631,235 | $ 569,555 |

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