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Segment Reporting (Schedule Of Segment Reporting Information By Segment) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 Intelliject [Member] | Sep. 30, 2012 Intelliject [Member] | Sep. 30, 2013 Intelliject [Member] | Sep. 30, 2012 Intelliject [Member] | Sep. 30, 2013 Film Products [Member] | Sep. 30, 2012 Film Products [Member] | Sep. 30, 2013 Film Products [Member] | Sep. 30, 2012 Film Products [Member] | Sep. 30, 2013 Aluminum Extrusions [Member] | Sep. 30, 2012 Aluminum Extrusions [Member] | Sep. 30, 2013 Aluminum Extrusions [Member] | Sep. 30, 2012 Aluminum Extrusions [Member] | Jun. 30, 2013 Alleghany And Bath County, Virginia [Member] | Sep. 30, 2013 Alleghany And Bath County, Virginia [Member]
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales | $ 235,686 | $ 210,518 | $ 706,131 | $ 631,746 |  |  |  |  | $ 157,187 | $ 155,296 | $ 469,838 | $ 459,221 | $ 78,499 | $ 55,222 | $ 236,293 | $ 172,525 |  |
Add back freight | 7,508 | 6,130 | 22,119 | 17,404 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales as shown in the Consolidated Statements of Income | 243,194 | 216,648 | 728,250 | 649,150 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ongoing operations |  |  |  |  |  |  |  |  | 19,617 | 21,092 | 55,351 | 49,999 | 3,426 | 1,846 | 12,351 | 7,349 |  |
Plant shutdowns, asset impairments, restructurings and other |  |  |  |  |  |  |  |  | (155) | (87) | (364) | (1,879) | (160) | (1,067) | (958) | (3,214) |  |
Total | 22,728 | 21,784 | 66,380 | 52,255 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income | 138 | 84 | 307 | 337 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense | 727 | 708 | 2,132 | 2,732 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on investment accounted for under fair value method |  |  | 100 | 9,000 | (3,100) | 2,700 | 100 | 9,000 |  |  |  |  |  |  |  |  |  |
Unrealized loss on investment property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 | 1,018
Stock option-based compensation costs | 260 | 386 | 859 | 1,147 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate expenses, net | 8,414 | 4,788 | 24,058 | 17,060 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations before income taxes | 10,365 | 18,686 | 38,720 | 40,653 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income taxes from continuing operations | 2,937 | 4,476 | 12,185 | 11,318 | 912 | (1,209) | (322) | (3,100) |  |  |  |  |  |  |  |  |  |
Income from continuing operations | 7,428 | 14,210 | 26,535 | 29,335 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss from discontinued operations | (450) | (6,783) | (13,990) | (11,557) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 6,978 | $ 7,427 | $ 12,545 | $ 17,778 | $ 1,388 | $ (1,880) | $ 227 | $ (4,926) |  |  |  |  |  |  |  |  |  |

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