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Inventories (Tables)
9 Months Ended
Sep. 30, 2012
Inventories [Abstract]  
Inventories
                 
    September 30,
2012
    December 31,
2011
 

Raw materials

  $ 14,330     $ 13,855  

Work in process

    9,239       8,425  

Finished goods

    22,615       23,743  
   

 

 

   

 

 

 
    $ 46,184     $ 46,023