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Deferred Revenue and Customer Advances (Tables)
3 Months Ended
Mar. 31, 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:
 
 
 
March 31,
 
 
December 31,
 
 
 
2019
 
 
2018
 
 
 
(in thousands)
 
Maintenance and training
 
$
58,394
 
 
$
58,362
 
Extended warranty
 
 
27,242
 
 
 
27,422
 
Customer advances, undelivered performance obligations and other
 
 
31,971
 
 
 
24,677
 
Total deferred revenue and customer advances
 
$
117,607
 
 
$
110,461