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Deferred Revenue and Customer Advances
 6 Months Ended
Jul. 04, 2021
Deferred Revenue and Customer Advances
J. 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