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Deferred Revenue And Customer Advances (Tables)
 3 Months Ended
Apr. 01, 2012
Deferred Revenue And Customer Advances [Abstract]  
Schedule Of Deferred Revenue And Customer Advances
     April 1,
2012		      December 31,
2011		  
     (in thousands)  

Customer advances

    $ 65,789       $ 70,001   

Maintenance, training and extended warranty

      37,408         33,953   

Undelivered elements

      7,211         7,939   

Acceptance

      99         318   
  

 

 

     

 

 

  

Total deferred revenue and customer advances

    $ 110,507       $ 112,211