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