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Inventory (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Inventory Disclosure [Abstract]    
Raw materials $ 21,628 $ 20,364
Work in process 5,024 6,601
Inventory, net 26,652 26,965
Allowance for inventory obsolescence $ 816 $ 486