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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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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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