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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, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |
Total net sales | $ 236,121 | $ 209,921 | $ 470,445 | $ 421,228
Add back freight | 7,409 | 5,938 | 14,611 | 11,274
Sales as shown in the Consolidated Statements of Income | 243,530 | 215,859 | 485,056 | 432,502
Total | 22,386 | 14,647 | 43,652 | 30,471
Interest income | 91 | 83 | 169 | 253
Interest expense | 715 | 1,017 | 1,405 | 2,024
Gain on investment accounted for under fair value method |  |  | 3,200 | 6,300
Stock option-based compensation costs | 283 | 315 | 599 | 761
Corporate expenses, net | 7,487 | 6,000 | 15,644 | 12,272
Income from continuing operations before income taxes | 15,074 | 10,098 | 28,355 | 21,967
Income taxes from continuing operations | 5,484 | 2,710 | 9,248 | 6,842
Income from continuing operations | 9,590 | 7,388 | 19,107 | 15,125
Loss from discontinued operations | (8,300) | (35) | (13,540) | (4,774)
Net income | 1,290 | 7,353 | 5,567 | 10,351
Intelliject [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gain on investment accounted for under fair value method | 2,100 | 2,700 | 3,200 | 6,300
Income taxes from continuing operations | (148) | (941) | (1,235) | (1,891)
Net income | (245) | (1,507) | (1,160) | (3,046)
Film Products [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net sales | 158,266 | 150,226 | 312,651 | 303,925
Ongoing operations | 18,727 | 13,441 | 35,734 | 28,907
Plant shutdowns, asset impairments, restructurings and other | (107) | (1,508) | (209) | (1,792)
Aluminum Extrusions [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net sales | 77,855 | 59,695 | 157,794 | 117,303
Ongoing operations | 4,311 | 3,800 | 8,925 | 5,503
Plant shutdowns, asset impairments, restructurings and other | (545) | (1,086) | (798) | (2,147)
Alleghany And Bath County, Virginia [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Unrealized loss on investment property | $ (1,018) |  | $ (1,018) |

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