REVENUE Deferred Revenue Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Movement in Deferred Revenue [Roll Forward]
Deferred revenue at beginning of period	$ 98,082	$ 99,259
Billings deferred	29,506	31,132
Recognition of prior deferred revenue	(35,266)	(32,885)
Deferred revenue at end of period	92,322	97,506
Deferred Revenue Arrangement [Line Items]
Remaining Performance Obligation	35,600
Deferred Revenue	92,322	$ 97,506
Subscription
Deferred Revenue Arrangement [Line Items]
Remaining Performance Obligation	6,210
Subscriptions
Deferred Revenue Arrangement [Line Items]
Remaining Performance Obligation	6,719
Maintenance contracts
Deferred Revenue Arrangement [Line Items]
Remaining Performance Obligation	71,294
Implied PCS
Deferred Revenue Arrangement [Line Items]
Remaining Performance Obligation	5,200
Professional services, training and other
Deferred Revenue Arrangement [Line Items]
Remaining Performance Obligation	$ 2,899