REVENUE Deferred Revenue Activity (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Movement in Deferred Revenue [Roll Forward]
Deferred revenue at beginning of period	$ 98,082	$ 99,259
Billings deferred	45,192	46,686
Recognition of prior deferred revenue	(62,341)	(54,362)
Deferred revenue at end of period	80,933	91,583
Deferred Revenue Arrangement [Line Items]
Remaining Performance Obligation	30,200
Deferred Revenue	80,933	$ 91,583
Subscription
Deferred Revenue Arrangement [Line Items]
Remaining Performance Obligation	7,373
Subscriptions
Deferred Revenue Arrangement [Line Items]
Remaining Performance Obligation	6,887
Maintenance contracts
Deferred Revenue Arrangement [Line Items]
Remaining Performance Obligation	59,994
Implied PCS
Deferred Revenue Arrangement [Line Items]
Remaining Performance Obligation	4,717
Professional services, training and other
Deferred Revenue Arrangement [Line Items]
Remaining Performance Obligation	$ 1,962