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Deferred Revenue and Customer Advances
 9 Months Ended
Sep. 27, 2020
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:
 
    
September 27,
     
December 31,
  
    
2020
     
2019
  
    
(in thousands)
  
Maintenance, service and training
    $ 71,362      $ 63,815  
Customer advances, undelivered elements and other
      68,472        56,358  
Extended warranty
      48,703        30,677  
  
 
 
     
 
 
  
Total deferred revenue and customer advances
    $ 188,537      $ 150,850