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Deferred Revenue and Customer Advances
 6 Months Ended
Jun. 30, 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:
                 
 
June 30,
2019
   
December 31,
2018
 
 
(in thousands)
 
Maintenance and training
  $
60,331
    $
58,362
  
Extended warranty
   
28,716
     
27,422
 
Customer advances, undelivered performance obligations and other
   
38,155
     
24,677
 
                 
Total deferred revenue and customer advances
  $
127,202
    $
110,461