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Segment Reporting (Schedule Of Identifiable Assets By Segment) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Subtotal | $ 700,655 | $ 681,121 |  |
General corporate | 50,789 | 53,222 |  |
Cash and cash equivalents | 37,685 | 48,822 | 70,816 | 68,939
Total assets | 789,129 | 783,165 |  |
Film Products [Member] |  |  |  |
Total assets | 563,667 | 551,842 |  |
Aluminum Extrusions [Member] |  |  |  |
Total assets | $ 136,988 | $ 129,279 |  |

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