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Segment Reporting (Schedule Of Identifiable Assets By Segment) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Subtotal $ 701,686 $ 681,121    
General corporate 49,004 53,222    
Cash and cash equivalents 42,604 48,822 44,167 68,939
Total assets 793,294 783,165    
Film Products [Member]
       
Total assets 572,681 551,842    
Aluminum Extrusions [Member]
       
Total assets $ 129,005 $ 129,279