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Inventories (Tables)
6 Months Ended
Jun. 30, 2012
Inventories [Abstract]  
Inventories
                 
    June  30,
2012
    December  31,
2011
 
   

Raw materials

  $ 14,647     $ 13,855  

Work in process

    8,833       8,425  

Finished goods

    21,884       23,743  
   

 

 

   

 

 

 
    $ 45,364     $ 46,023