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Deferred Revenue and Customer Advances (Tables)
 3 Months Ended
Mar. 29, 2020
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:
 
March 29,
 
  
December 31,
 
  
2020
 
  
2019
 
  
(in thousands)
 
Maintenance, se
r
vice and training
  $
68,483
    $
63,815
  
Extended warranty
   
33,503
     
30,677
 
Customer advances, undelivered elements and other
   
47,620
     
56,358
 
                 
Total deferred revenue and customer advances
  $
149,606
    $
150,850