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Inventories (Schedule Of Components Of Inventories) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Inventories [Abstract]    
Finished goods $ 16,405 $ 16,138
Work-in-process 8,816 7,451
Raw materials 28,282 28,758
Stores, supplies and other 23,246 22,323
Total $ 76,749 $ 74,670