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Deferred Revenue and Customer Advances
 9 Months Ended
Sep. 29, 2019
Deferred Revenue and Customer Advances
K. 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