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Net Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Inventory, Net [Abstract]    
Finished goods $ 26,960 $ 26,885
Work in process 24,147 19,190
Raw materials 13,440 11,261
Supplies 4,918 4,759
Total $ 69,465 $ 62,095