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Goodwill (Tables)
12 Months Ended
Dec. 31, 2011
Goodwill [Abstract]  
Changes in the carrying value of goodwill
                         
    MVSD     SISD     Consolidated  

Balance as of December 31, 2009

  $ 77,840     $ 4,764     $ 82,604  

Foreign currency exchange rate changes

    (198     (202     (400
   

 

 

   

 

 

   

 

 

 

Balance as of December 31, 2010

    77,642       4,562       82,204  

Foreign currency exchange rate changes

    (86 )      (89 )      (175 ) 
   

 

 

   

 

 

   

 

 

 

Balance as of December 31, 2011

  $     77,556     $     4,473     $     82,029