REVENUE - Revenue Stream (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 265,591	$ 212,546
Revenue recognized at a point in time
Disaggregation of Revenue [Line Items]
Revenue	93,916	63,264
Revenue recognized over time
Disaggregation of Revenue [Line Items]
Revenue	171,675	149,282
Perpetual license | Revenue recognized at a point in time
Disaggregation of Revenue [Line Items]
Revenue	3,659	14,950
Term license | Revenue recognized at a point in time
Disaggregation of Revenue [Line Items]
Revenue	90,257	48,314
Maintenance | Revenue recognized over time
Disaggregation of Revenue [Line Items]
Revenue	73,695	67,706
Subscription
Disaggregation of Revenue [Line Items]
Revenue	207,418	143,778
Cloud | Revenue recognized over time
Disaggregation of Revenue [Line Items]
Revenue	43,466	27,758
Consulting | Revenue recognized over time
Disaggregation of Revenue [Line Items]
Revenue	$ 54,514	$ 53,818