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Inventories (Tables)
3 Months Ended
Mar. 31, 2013
Inventories [Abstract]  
Summary of Inventories
                 
    March 31,
2013
    December 31,
2012
 

Raw materials

  $ 12,626     $ 13,013  

Work in process

    8,470       8,561  

Finished goods

    23,494       24,576  
   

 

 

   

 

 

 
    $ 44,590     $ 46,150