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Deferred Revenue and Customer Advances (Tables)
 9 Months Ended
Sep. 29, 2019
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 29,
2019
 
  
December 31,
2018
 
 
(in thousands)
 
Maintenance and training
  $
61,048
    $
58,362
 
Extended warranty
   
29,937
     
27,422
 
Customer advances, undelivered performance obligations and other
   
47,543
     
24,677
 
                 
Total deferred revenue and customer advances
  $
138,528
    $
110,461