DISAGGREGATION OF REVENUE - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue
Total revenues	$ 1,951,751	$ 1,850,204	$ 1,592,287
Corporate
Disaggregation of Revenue
Total revenues	(16,236)	(15,814)	(19,006)
Intercompany
Disaggregation of Revenue
Total revenues	(23,566)	(21,636)	(22,033)
Corporate and Elimination
Disaggregation of Revenue
Total revenues	(16,236)	(15,814)	(19,006)
Enterprise Software | Intercompany
Disaggregation of Revenue
Total revenues	23,566	21,636	22,033
Enterprise Software | Operating segments
Disaggregation of Revenue
Total revenues	1,373,221	1,278,822	1,165,576
Platform Technologies | Intercompany
Disaggregation of Revenue
Total revenues	0	0	0
Platform Technologies | Operating segments
Disaggregation of Revenue
Total revenues	594,766	587,196	445,717
Recurring revenues
Disaggregation of Revenue
Total revenues	1,626,173	1,480,759	1,258,722
Recurring revenues | Corporate
Disaggregation of Revenue
Total revenues	0	0	0
Recurring revenues | Enterprise Software
Disaggregation of Revenue
Total revenues	1,077,043	970,466	864,667
Recurring revenues | Platform Technologies
Disaggregation of Revenue
Total revenues	549,130	510,293	394,055
Non-recurring revenues
Disaggregation of Revenue
Total revenues	325,578	369,445	333,565
Non-recurring revenues | Corporate
Disaggregation of Revenue
Total revenues	7,330	5,822	3,027
Non-recurring revenues | Enterprise Software
Disaggregation of Revenue
Total revenues	272,612	286,720	278,876
Non-recurring revenues | Platform Technologies
Disaggregation of Revenue
Total revenues	45,636	76,903	51,662
Products and services transferred at a point in time
Disaggregation of Revenue
Total revenues	72,022	82,716	84,781
Products and services transferred over time
Disaggregation of Revenue
Total revenues	1,879,729	1,767,488	1,507,506
SaaS
Disaggregation of Revenue
Total revenues	527,977	428,526	342,118
SaaS | Corporate
Disaggregation of Revenue
Total revenues	0	0	0
SaaS | Enterprise Software | Operating segments
Disaggregation of Revenue
Total revenues	459,544	378,953	310,416
SaaS | Platform Technologies | Operating segments
Disaggregation of Revenue
Total revenues	68,433	49,573	31,702
SaaS | Products and services transferred at a point in time
Disaggregation of Revenue
Total revenues	0	0	0
SaaS | Products and services transferred over time
Disaggregation of Revenue
Total revenues	527,977	428,526	342,118
Transaction-based fees
Disaggregation of Revenue
Total revenues	631,535	583,778	442,317
Transaction-based fees | Corporate
Disaggregation of Revenue
Total revenues	0	0	0
Transaction-based fees | Enterprise Software | Operating segments
Disaggregation of Revenue
Total revenues	174,718	147,370	114,662
Transaction-based fees | Platform Technologies | Operating segments
Disaggregation of Revenue
Total revenues	456,817	436,408	327,655
Transaction-based fees | Products and services transferred at a point in time
Disaggregation of Revenue
Total revenues	0	0	0
Transaction-based fees | Products and services transferred over time
Disaggregation of Revenue
Total revenues	631,535	583,778	442,317
Maintenance
Disaggregation of Revenue
Total revenues	466,661	468,455	474,287
Maintenance | Corporate
Disaggregation of Revenue
Total revenues	0	0	0
Maintenance | Enterprise Software | Operating segments
Disaggregation of Revenue
Total revenues	442,781	444,143	439,589
Maintenance | Platform Technologies | Operating segments
Disaggregation of Revenue
Total revenues	23,880	24,312	34,698
Maintenance | Products and services transferred at a point in time
Disaggregation of Revenue
Total revenues	0	0	0
Maintenance | Products and services transferred over time
Disaggregation of Revenue
Total revenues	466,661	468,455	474,287
Professional services
Disaggregation of Revenue
Total revenues	249,976	277,625	237,179
Professional services | Corporate
Disaggregation of Revenue
Total revenues	0	0	0
Professional services | Enterprise Software | Operating segments
Disaggregation of Revenue
Total revenues	209,727	204,970	193,184
Professional services | Platform Technologies | Operating segments
Disaggregation of Revenue
Total revenues	40,249	72,655	43,995
Professional services | Products and services transferred at a point in time
Disaggregation of Revenue
Total revenues	0	0	0
Professional services | Products and services transferred over time
Disaggregation of Revenue
Total revenues	249,976	277,625	237,179
Software licenses and royalties
Disaggregation of Revenue
Total revenues	38,096	59,406	74,452
Software licenses and royalties | Corporate
Disaggregation of Revenue
Total revenues	0	0	0
Software licenses and royalties | Enterprise Software | Operating segments
Disaggregation of Revenue
Total revenues	32,709	55,158	66,816
Software licenses and royalties | Platform Technologies | Operating segments
Disaggregation of Revenue
Total revenues	5,387	4,248	7,636
Software licenses and royalties | Products and services transferred at a point in time
Disaggregation of Revenue
Total revenues	34,516	50,302	62,847
Software licenses and royalties | Products and services transferred over time
Disaggregation of Revenue
Total revenues	3,580	9,104	11,605
Hardware and other
Disaggregation of Revenue
Total revenues	37,506	32,414	21,934
Hardware and other | Products and services transferred at a point in time
Disaggregation of Revenue
Total revenues	37,506	32,414	21,934
Hardware and other | Products and services transferred over time
Disaggregation of Revenue
Total revenues	$ 0	$ 0	$ 0