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Inventories, Net (Tables)
3 Months Ended
Mar. 31, 2013
Inventories, Net [Abstract]  
Components of inventories
                 
    March 31,     December 31,  
    2013     2012  
    (in thousands)  

Raw material

  $ 13,490     $ 11,192  

Work-in-process

    10,955       11,123  

Finished goods

    11,763       16,128  
   

 

 

   

 

 

 
    $ 36,208     $ 38,443