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Deferred Revenue and Customer Advances (Tables)
6 Months Ended
Jul. 04, 2021
Revenue Recognition and Deferred Revenue [Abstract]  
Deferred Revenue and Customer Advances
Deferred revenue and customer advances consist of the following and are included in short and long-term deferred revenue and customer advances on the balance sheet:
 
    
July 4,

2021
    
December 31,

2020
 
    
(in thousands)
 
Maintenance, service and training
   $ 83,557      $ 77,654  
Extended warranty
     63,525        51,929  
Customer advances, undelivered elements and other
     60,334        63,438  
    
 
 
    
 
 
 
Total deferred revenue and customer advances
   $ 207,416      $ 193,021