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Severance Charges (Tables)
 3 Months Ended
Mar. 31, 2013
Severance Charges [Abstract]  
A summary of the activity related to the severance charges
                         
    BBU     VI Chip     Total  

Balance as of December 31, 2012

   $ —       $ —       $ —    

Charges

     1,123       238       1,361  

Payments

     (201 )      (81 )      (282 ) 
   

 

 

    

 

 

    

 

 

  

Balance as of March 31, 2013

   $ 922     $ 157     $ 1,079