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Segment Information (Tables)
6 Months Ended
Jul. 03, 2011
Segment Information [Abstract]  
Information about the Company's segments
                                 
Three-months Ended                   Reconciling        
July 3, 2011   MVSD     SISD     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                   Reconciling        
July 3, 2011   MVSD     SISD     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  
                                 
Three-months Ended                   Reconciling        
July 4, 2010   MVSD     SISD     Items     Consolidated  
 
Product revenue
  $ 59,345     $ 7,722     $ -     $ 67,067  
Service revenue
    1,653       3,091       -       4,744  
Operating income
    22,939       1,330       (5,028)       19,241  
                                 
Six-months Ended                   Reconciling        
July 4, 2010   MVSD     SISD     Items     Consolidated  
 
Product revenue
  $ 109,005     $ 12,675     $ -     $ 121,680  
Service revenue
    3,150       5,948       -       9,098  
Operating income
    38,384       1,002       (8,893)       30,493