REVENUE Remaining Performance Obligations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2026	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred Revenue Arrangement [Line Items]
Revenue, Performance Obligation, Description of Timing	six years
Remaining Performance Obligation	$ 49,500
Unbilled Receivables, Not Billable	44,200
Products
Deferred Revenue Arrangement [Line Items]
Remaining Performance Obligation	6,852
Subscription services
Deferred Revenue Arrangement [Line Items]
Remaining Performance Obligation	5,718
Maintenance contracts
Deferred Revenue Arrangement [Line Items]
Remaining Performance Obligation	75,174
Implied PCS
Deferred Revenue Arrangement [Line Items]
Remaining Performance Obligation	7,652
Implied PCS | Forecast [Member]
Deferred Revenue Arrangement [Line Items]
Remaining Performance Obligation		$ 300	$ 500	$ 900	$ 1,400	$ 2,100	$ 2,500
Professional services, training and other
Deferred Revenue Arrangement [Line Items]
Remaining Performance Obligation	$ 2,110