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Business Segments (Schedule Of Segment Reporting Information By Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales | [1],[2] |  |  |  |  |  |  |  |  |  |  |  | $ 927,647 |  | $ 799,272 |  | $ 866,339 |  |
Add back freight |  |  |  |  |  |  |  |  |  |  |  |  | 33,683 |  | 29,069 |  | 29,838 |  |
Sales as shown in consolidated statements of income |  | $ 245,836 |  | $ 247,121 | $ 247,347 | $ 221,026 | $ 204,772 |  | $ 207,702 | $ 208,533 | $ 207,333 |  | 961,330 |  | 828,341 |  | 896,177 |  |
Goodwill, Impairment Loss |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | (44,465) |  |
Total |  |  |  |  |  |  |  |  |  |  |  |  | (11,608) |  | 60,323 |  | 34,622 |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | 209 |  | 261 |  | 294 |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 6,170 |  | 3,806 |  | 3,502 |  |
Gain (loss) on investment accounted for under the fair value method |  |  |  |  |  |  |  |  |  |  |  |  | 33,800 |  | 1,600 |  | (20,500) |  |
Stock option-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  | 264 |  | 56 |  | 483 |  |
Corporate expenses, net | [3] |  |  |  |  |  |  |  |  |  |  |  | 30,879 |  | 29,607 |  | 33,638 |  |
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  |  | (14,912) |  | 27,683 |  | (23,207) |  |
Income tax expense (benefit) | [3] |  |  |  |  |  |  |  |  |  |  |  | (53,163) |  | 3,217 |  | 8,928 |  |
Net income (loss) |  | (17,929) |  | $ 8,274 | $ 44,204 | $ 3,703 | 1,728 |  | $ 12,048 | $ 3,408 | $ 7,281 |  | 38,251 |  | 24,466 |  | (32,135) |  |
Freight |  |  |  |  |  |  |  |  |  |  |  |  | 33,683 |  | 29,069 |  | 29,838 |  |
Cash and cash equivalents |  | 36,491 | [1] |  |  |  | 29,511 | [1] |  |  |  |  | 36,491 | [1] | 29,511 | [1] | 44,156 |  | $ 50,056
Foreign Country |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 32,700 |  |  |  |  | 23,800 |  |  |  |  |  | 32,700 |  | 23,800 |  |  |  |
Pension Benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined benefit pension plan net liability |  | $ (91,769) |  |  |  |  | (88,567) |  |  |  |  |  | (91,769) |  | (88,567) |  |  |  |
kaleo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on investment accounted for under the fair value method |  |  |  |  |  |  | 1,600 |  |  |  |  |  | 33,800 | [3] | 1,600 | [3] | (20,500) | [3] |
Alleghany and Bath County, Virginia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on investment accounted for under the fair value method |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  | 0 |  | (1,032) |  | 0 |  |
Unrealized Gain (Loss) on Investment Property |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | (1,032) |  | 0 |  |
PE Films [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  |  |  |  | 352,459 |  | 331,146 |  | 385,550 |  |
Ongoing operations |  |  |  |  |  |  |  |  |  |  |  |  | 41,546 |  | 26,312 |  | 48,275 |  |
Plant shutdowns, asset impairments, restructurings and other | [3] |  |  |  |  |  |  |  |  |  |  |  | (4,905) |  | (4,602) |  | (4,180) |  |
Aluminum Extrusions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  |  |  |  | 466,833 |  | 360,098 |  | 375,457 |  |
Ongoing operations |  |  |  |  |  |  |  |  |  |  |  |  | 43,454 |  | 37,794 |  | 30,432 |  |
Plant shutdowns, asset impairments, restructurings and other | [3] |  |  |  |  |  |  |  |  |  |  |  | 321 |  | (741) |  | (708) |  |
Flexible Packaging Films [Member] [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  |  |  |  | 108,355 |  | 108,028 |  | 105,332 |  |
Ongoing operations |  |  |  |  |  |  |  |  |  |  |  |  | (2,626) |  | 1,774 |  | 5,453 |  |
Plant shutdowns, asset impairments, restructurings and other | [3] |  |  |  |  |  |  |  |  |  |  |  | (89,398) |  | (214) |  | (185) |  |
Goodwill, Impairment Loss |  |  |  |  |  |  |  |  |  |  |  | $ (44,500) | $ 0 |  | $ 0 |  | $ (44,465) |  |
[1] | Information on exports and foreign operations are provided on the previous page. Cash and cash equivalents includes funds held in locations outside the U.S. of $32.7 million and $23.8 million at December 31, 2017 and 2016, respectively. Export sales relate almost entirely to PE Films. Operations outside the U.S. in The Netherlands, Hungary, China and India also relate to PE Films. Operations in Brazil are primarily related to Flexible Packaging Films, but also include PE Films operations. Sales from locations in The Netherlands and Hungary are primarily to customers located in Europe. Sales from locations in China (Guangzhou and Shanghai) are primarily to customers located in China, but also include other customers in Asia.
[2] | The difference between total consolidated sales as reported in the consolidated statements of income and segment, geographic and product group net sales reported in this note is freight of $33.7 million in 2017, $29.1 million in 2016 and $29.8 million in 2015.
[3] | See Notes 1, 3, 4 and 17 for more information on losses associated with plant shutdowns, asset impairments and restructurings, unusual items, gains or losses from sale of assets, gains or losses on an investment accounted for under the fair value method and other items.

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