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Segment Information (Tables)
3 Months Ended
Apr. 01, 2012
Segment Information [Abstract]  
Information about the Company's segments
                                         

Quarter Ended

April 1, 2012

  MVSD   SISD   Reconciling
Items
  Consolidated

Product revenue

    $ 64,221       $ 7,186       $       $ 71,407  

Service revenue

      1,920         4,382                 6,302  

Operating income

      21,144         2,392         (5,795 )       17,741  
         

Quarter Ended

April 3, 2011

               

Product revenue

    $ 62,817       $ 6,060       $       $ 68,877  

Service revenue

      1,969         3,548                 5,517  

Operating income

      22,027         997         (5,656 )       17,368