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Inventories (Schedule Of Components Of Inventories) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Inventory, Net [Abstract]    
Finished goods $ 16,791 $ 14,953
Work-in-process 6,597 7,750
Raw materials 22,323 24,477
Stores, supplies and other 24,444 23,483
Total $ 70,155 $ 70,663