SEGMENT AND RELATED INFORMATION - Schedule of Segment Revenues and Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information
Total revenues	$ 1,850,204	$ 1,592,287	$ 1,116,663
Depreciation and amortization expense	159,072	135,624	81,657
Segment operating income	214,249	180,735	172,926
Software development expenditures	27,622	21,693	5,776
Capital expenditures	22,529	33,919	22,690
Total assets	4,687,417	4,732,161	2,607,274
Intercompany
Segment Reporting Information
Total revenues	(21,636)	(22,033)	(19,131)
Intercompany | Enterprise Software
Segment Reporting Information
Total revenues	21,636	22,033	19,131
Intercompany | Platform Technologies
Segment Reporting Information
Total revenues	0	0	0
Operating segments | Enterprise Software
Segment Reporting Information
Total revenues	1,278,822	1,165,576	1,058,669
Depreciation and amortization expense	55,389	54,011	52,715
Segment operating income	418,776	401,382	355,679
Software development expenditures	3,790	3,504	0
Capital expenditures	8,972	19,213	14,246
Total assets	636,377	601,390	561,324
Operating segments | Platform Technologies
Segment Reporting Information
Total revenues	587,196	445,717	77,114
Depreciation and amortization expense	84,609	55,539	15,717
Segment operating income	123,291	92,582	15,569
Software development expenditures	14,581	12,332	5,776
Capital expenditures	6,845	3,696	652
Total assets	362,610	359,919	57,420
Corporate
Segment Reporting Information
Total revenues	(15,814)	(19,006)	(19,120)
Depreciation and amortization expense	19,074	26,074	13,225
Segment operating income	(214,263)	(222,779)	(144,698)
Software development expenditures	9,251	5,857	0
Capital expenditures	6,712	11,010	7,792
Total assets	3,688,430	3,770,852	1,988,530
Operating segment and corporate non-segment
Segment Reporting Information
Segment operating income	327,804	271,185	226,550
Subscriptions
Segment Reporting Information
Total revenues	1,012,304	784,435	350,648
Subscriptions | Enterprise Software
Segment Reporting Information
Total revenues	526,323	425,078	339,842
Subscriptions | Platform Technologies
Segment Reporting Information
Total revenues	485,981	359,357	10,806
Subscriptions | Corporate
Segment Reporting Information
Total revenues	0	0	0
Maintenance
Segment Reporting Information
Total revenues	468,455	474,287	467,513
Maintenance | Enterprise Software
Segment Reporting Information
Total revenues	444,143	439,589	427,813
Maintenance | Platform Technologies
Segment Reporting Information
Total revenues	24,312	34,698	39,700
Maintenance | Corporate
Segment Reporting Information
Total revenues	0	0	0
Professional services
Segment Reporting Information
Total revenues	243,117	209,391	186,409
Professional services | Enterprise Software
Segment Reporting Information
Total revenues	170,462	165,396	165,022
Professional services | Platform Technologies
Segment Reporting Information
Total revenues	72,655	43,995	21,387
Professional services | Corporate
Segment Reporting Information
Total revenues	0	0	0
Software licenses and royalties
Segment Reporting Information
Total revenues	59,406	74,452	73,164
Software licenses and royalties | Enterprise Software
Segment Reporting Information
Total revenues	55,158	66,816	67,979
Software licenses and royalties | Platform Technologies
Segment Reporting Information
Total revenues	4,248	7,636	5,185
Software licenses and royalties | Corporate
Segment Reporting Information
Total revenues	0	0	0
Appraisal services
Segment Reporting Information
Total revenues	34,508	27,788	21,127
Appraisal services | Enterprise Software
Segment Reporting Information
Total revenues	34,508	27,788	21,127
Appraisal services | Platform Technologies
Segment Reporting Information
Total revenues	0	0	0
Appraisal services | Corporate
Segment Reporting Information
Total revenues	0	0	0
Hardware and other
Segment Reporting Information
Total revenues	32,414	21,934	17,802
Hardware and other | Enterprise Software
Segment Reporting Information
Total revenues	26,592	18,876	17,755
Hardware and other | Platform Technologies
Segment Reporting Information
Total revenues	0	31	36
Hardware and other | Corporate
Segment Reporting Information
Total revenues	$ 5,822	$ 3,027	$ 11