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Segment Reporting (Schedule Of Identifiable Assets By Segment) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Dec. 31, 2010
--- | --- | --- | --- | ---
Subtotal | $ 645,708 | $ 670,752 |  |
General corporate | 48,006 | 40,919 |  |
Cash and cash equivalents | 44,167 | 68,939 | 109,403 | 73,191
Total assets | 737,881 | 780,610 |  |
Film Products [Member] |  |  |  |
Total assets | 548,591 | 574,571 |  |
Aluminum Extrusions [Member] |  |  |  |
Total assets | 75,562 | 78,661 |  |
Other [Member] |  |  |  |
Total assets | $ 21,555 | $ 17,520 |  |

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