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Deferred Revenue and Customer Advances
 6 Months Ended
Jun. 28, 2020
Deferred Revenue and Customer Advances
I. 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:
 
    
June 28,
2020
     
December 31,
2019
  
    
(in thousands)
  
Maintenance, service and training
    $ 75,144      $ 63,815  
Extended warranty
      40,178        30,677  
Customer advances, undelivered elements and other
      64,536        56,358  
  
 
 
     
 
 
  
Total deferred revenue and customer advances
    $ 179,858      $ 150,850