REVENUE Deferred Revenue Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred Revenue Arrangement [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	6 years
Revenue, Remaining Performance Obligation, Amount	$ 57,600
Unbilled Receivables, Not Billable	55,300
Movement in Deferred Revenue [Roll Forward]
Deferred Revenue	101,288						$ 99,601
Deferred Revenue, Additions	30,369
Deferred Revenue, Revenue Recognized	28,682
Product [Member]
Deferred Revenue Arrangement [Line Items]
Revenue, Remaining Performance Obligation, Amount	8,470
Subscription Arrangement [Member]
Deferred Revenue Arrangement [Line Items]
Revenue, Remaining Performance Obligation, Amount	993
Software Service, Support and Maintenance Arrangement [Member]
Deferred Revenue Arrangement [Line Items]
Revenue, Remaining Performance Obligation, Amount	74,464
Nonsoftware Service, Support and Maintenance Arrangement [Member]
Deferred Revenue Arrangement [Line Items]
Revenue, Remaining Performance Obligation, Amount	15,237	$ 1,000	$ 1,500	$ 2,900	$ 4,800	$ 5,000
Software License Arrangement [Member]
Deferred Revenue Arrangement [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 2,124