Deferred Revenue and Customer Advances

3 Months Ended

Mar. 31, 2013

Deferred Revenue and Customer Advances

F. 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.

	March 31, 2013		December 31, 2012
	(in thousands)
Customer advances	$	29,951	$	39,613
Maintenance, training and extended warranty		50,021		51,198
Undelivered elements		7,466		6,773
Total deferred revenue and customer advances	$	87,438	$	97,584