REVENUE Deferred Revenue Activity (Tables)

6 Months Ended

Jun. 30, 2019

Deferred Revenue Arrangement [Line Items]

Deferred Revenue, by Arrangement, Disclosure [Table Text Block]

Deferred Revenue

Deferred revenue activity for the six months ended June 30, 2019 was as follows (in thousands):

	June 30, 2019
Deferred revenue at January 1, 2019	$	99,601
Billings deferred	55,310
Recognition of prior deferred revenue	(61,395		)
Deferred revenue at June 30, 2019	$	93,516

A summary of the significant performance obligations included in deferred revenue as of June 30, 2019 is as follows (in thousands):

	June 30, 2019
Product	$	7,288
Subscription	1,350
Support contracts	69,062
Implied PCS	14,033
Professional services, training and other	1,783
Deferred revenue at June 30, 2019	$	93,516