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Severance Charges (Tables)
 9 Months Ended
Sep. 30, 2013
Restructuring And Related Activities [Abstract]  
A Summary of Activity Related to Severance Charges

A summary of the activity related to the severance charges, by segment, for the nine months ended September 30, 2013 is as follows (in thousands):

 

     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  

Payments

      (417 )      (51 )      (468 ) 
  

 

 

    

 

 

    

 

 

  

Balance as of June 30, 2013

      505       106       611  

Payments

      (268 )      (94 )      (362 ) 
  

 

 

    

 

 

    

 

 

  

Balance as of September 30, 2013

    $ 237     $ 12     $ 249