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Segment Reporting (Schedule Of Identifiable Assets By Segment) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Subtotal $ 715,490 $ 691,801    
General corporate 47,813 48,590    
Cash and cash equivalents 45,227 52,617 37,685 48,822
Total assets 808,530 793,008    
Film Products
       
Total assets 573,335 556,873    
Aluminum Extrusions
       
Total assets $ 142,155 $ 134,928