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Segment Information (Tables)
6 Months Ended
Jul. 01, 2012
Segment Information [Abstract]  
Information about the Company's segments
                                 
Three-months Ended July 1, 2012   MVSD     SISD     Reconciling
Items
    Consolidated  
         

Product revenue

  $   69,743     $   8,706     $ —       $ 78,449  

Service revenue

    1,778       4,099       —         5,877  

Operating income

    25,035       2,848       (4,533     23,350  

 

                                 
Six-months Ended July 1, 2012   MVSD     SISD     Reconciling
Items
    Consolidated  
         

Product revenue

  $ 133,964     $ 15,892     $ —       $ 149,856  

Service revenue

    3,698       8,481       —         12,179  

Operating income

    46,179       5,240       (10,328     41,091  

 

                                 
Three-months Ended July 3, 2011   MVSD     SISD     Reconciling
Items
    Consolidated  
         

Product revenue

  $   70,942     $   6,624     $ —       $ 77,566  

Service revenue

    1,834       3,993       —         5,827  

Operating income

    26,587       2,022       (4,567     24,042  

 

                                 
Six-months Ended July 3, 2011   MVSD     SISD     Reconciling
Items
    Consolidated  
         

Product revenue

  $ 133,759     $ 12,684     $ —       $ 146,443  

Service revenue

    3,803       7,541       —         11,344  

Operating income

    48,614       3,019       (10,223     41,410