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Segment Reporting (Schedule Of Segment Reporting Information By Segment) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Segment Reporting Information [Line Items] |  |  |  |
Total net sales | $ 210,175 | $ 196,224 | $ 422,037 | $ 383,749
Add back freight | 5,938 | 4,742 | 11,274 | 8,741
Sales as shown in the Consolidated Statements of Income | 216,113 | 200,966 | 433,311 | 392,490
Total | 14,655 | 13,305 | 30,655 | 27,435
Interest income | 83 | 270 | 253 | 500
Interest expense | 1,017 | 361 | 2,024 | 716
Gain on investment accounted for under fair value method | 2,700 |  | 6,300 |
Stock option-based compensation costs | 315 | 516 | 761 | 1,007
Corporate expenses, net | 6,065 | 3,178 | 12,417 | 7,034
Income from continuing operations before income taxes | 10,041 | 9,520 | 22,006 | 19,178
Income taxes from continuing operations | 2,688 | 3,472 | 6,855 | 6,462
Income from continuing operations | 7,353 | 6,048 | 15,151 | 12,716
Loss from discontinued operations |  | (345) | (4,800) | (345)
Net income | 7,353 | 5,703 | 10,351 | 12,371
Film Products [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net sales | 150,226 | 132,035 | 303,925 | 263,556
Ongoing operations | 13,441 | 12,794 | 28,907 | 28,387
Plant shutdowns, asset impairments, restructurings and other | (1,508) | (1,084) | (1,792) | (1,084)
Aluminum Extrusions [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net sales | 59,695 | 63,896 | 117,303 | 119,897
Ongoing operations | 3,800 | 1,467 | 5,503 | 238
Plant shutdowns, asset impairments, restructurings and other | (1,086) | 94 | (2,147) | 62
Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net sales | 254 | 293 | 809 | 296
Ongoing operations | $ 8 | $ 34 | $ 184 | $ (168)

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