REVENUE Deferred Revenue Activity (Tables)

6 Months Ended

Jun. 30, 2018

Deferred Revenue Arrangement [Line Items]

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

	June 30, 2018
Product	$	9,261
Subscription	753
Support Contracts	62,448
Implied PCS	19,043
Professional services, training and other	6,193
Deferred revenue at June 30, 2018	$	97,698

Deferred Revenue Disclosure [Text Block]

	June 30, 2018
Deferred revenue at January 1, 2018	$	101,740
Billings deferred	50,765
Recognition of prior deferred revenue	(54,807		)
Deferred revenue at June 30, 2018	$	97,698

Deferred Revenue

Deferred revenue activity for the six months endedJune 30, 2018 was as follows (in thousands):

	June 30, 2018
Deferred revenue at January 1, 2018	$	101,740
Billings deferred	50,765
Recognition of prior deferred revenue	(54,807		)
Deferred revenue at June 30, 2018	$	97,698

A summary of the significant performance obligations included in deferred revenue as of June 30, 2018 is as follows (in thousands):

	June 30, 2018
Product	$	9,261
Subscription	753
Support Contracts	62,448
Implied PCS	19,043
Professional services, training and other	6,193
Deferred revenue at June 30, 2018	$	97,698

We expect deferred revenue recorded as of June 30, 2018 will be recorded as revenue within the next 12 months, except for Implied PCS performance obligations and long-term support agreements. We expect $6 million, $5 million, $3 million, and $1 million of Implied PCS deferred revenue recorded as of June 30, 2018 will be recognized as revenue for the years ended December 31, 2019, 2020, 2021, and 2022, respectively.