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Inventories (Tables)
12 Months Ended
Dec. 31, 2012
Inventories [Abstract]  
Components of Inventories
                 
    2012     2011  
    (in thousands)  

Raw materials

  $ 16,422     $ 18,297  

Work in process

    19,234       17,528  
   

 

 

   

 

 

 

Inventories

  $ 35,656     $ 35,825