Deferred Revenue and Customer Advances (Tables)

9 Months Ended

Sep. 30, 2012

Schedule Of 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.

	September 30, 2012		December 31, 2011
	(in thousands)
Customer advances	$	44,152	$	70,001
Maintenance, training and extended warranty		50,208		33,953
Undelivered elements		7,200		7,939
Acceptance		—		318
Total deferred revenue and customer advances	$	101,560	$	112,211