REVENUE Deferred Revenue Activity (Tables)

3 Months Ended

Mar. 31, 2018

Deferred Revenue Arrangement [Line Items]

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

	March 31, 2018
Product	$	9,917
Subscription	580
Support Contracts	73,027
Implied PCS	21,280
Professional services, training and other	1,569
Deferred revenue at March 31, 2018	$	106,373

Deferred Revenue Disclosure [Text Block]

Deferred Revenue

Deferred revenue activity for the three months endedMarch 31, 2018 was as follows (in thousands):

	March 31, 2018
Deferred revenue at January 1, 2018	$	101,740
Billings deferred	38,117
Recognition of prior deferred revenue	(33,484		)
Deferred revenue at March 31, 2018	$	106,373

A summary of the significant performance obligations included in deferred revenue as of March 31, 2018 is as follows (in thousands):

	March 31, 2018
Product	$	9,917
Subscription	580
Support Contracts	73,027
Implied PCS	21,280
Professional services, training and other	1,569
Deferred revenue at March 31, 2018	$	106,373

We expect deferred revenue recorded as of March 31, 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 March 31, 2018 will be recognized as revenue for the years ended December 31, 2019, 2020, 2021, and 2022, respectively.

	March 31, 2018
Deferred revenue at January 1, 2018	$	101,740
Billings deferred	38,117
Recognition of prior deferred revenue	(33,484		)
Deferred revenue at March 31, 2018	$	106,373