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Segment Reporting (Schedule Of Identifiable Assets By Segment) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Subtotal $ 706,707 $ 691,801    
General corporate 48,017 48,590    
Cash and cash equivalents 51,930 52,617 42,604 48,822
Total assets 806,654 793,008    
Film Products
       
Total assets 561,403 556,873    
Aluminum Extrusions
       
Total assets $ 145,304 $ 134,928