Segment Reporting (Schedule Of Identifiable Assets By Segment) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010
Subtotal	$ 654,920	$ 670,752
General corporate	46,935	40,919
Cash and cash equivalents	52,559	68,939	93,784	73,191
Total	754,414	780,610
Film Products [Member]
Total	554,592	574,571
Aluminum Extrusions [Member]
Total	79,160	78,661
Other [Member]
Total	$ 21,168	$ 17,520