CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues:
Total revenues	$ 404,075	$ 271,091	$ 698,877	$ 547,632
Cost of revenues:
Total cost of revenues	222,014	139,888	372,609	287,298
Gross profit	182,061	131,203	326,268	260,334
Selling, general and administrative expenses	108,922	62,521	187,696	130,006
Research and development expense	23,428	21,949	45,241	44,310
Amortization of other intangibles	11,420	5,392	16,832	10,784
Operating income	38,291	41,341	76,499	75,234
Other (expense) income including interest expense, net	(12,199)	470	(12,111)	1,460
Income before income taxes	26,092	41,811	64,388	76,694
Income tax provision (benefit)	562	(12,081)	1,882	(24,748)
Net income	$ 25,530	$ 53,892	$ 62,506	$ 101,442
Earnings per common share:
Basic (usd per share)	$ 0.63	$ 1.35	$ 1.53	$ 2.54
Diluted (usd per share)	$ 0.61	$ 1.30	$ 1.48	$ 2.44
Software licenses and royalties
Revenues:
Total revenues	$ 17,604	$ 17,025	$ 32,537	$ 35,762
Cost of revenues:
Total cost of revenues	1,368	1,130	2,604	1,870
Subscriptions
Revenues:
Total revenues	199,558	85,638	302,037	167,361
Software services
Revenues:
Total revenues	53,337	43,654	100,977	95,787
Maintenance
Revenues:
Total revenues	119,621	116,760	238,733	231,125
Appraisal services
Revenues:
Total revenues	6,265	4,696	12,730	10,459
Cost of revenues:
Total cost of revenues	4,429	3,976	9,046	8,361
Hardware and other
Revenues:
Total revenues	7,690	3,318	11,863	7,138
Cost of revenues:
Total cost of revenues	4,623	2,489	7,081	4,968
Acquired software
Cost of revenues:
Total cost of revenues	11,823	8,006	19,787	16,033
Subscriptions, software services and maintenance
Cost of revenues:
Total cost of revenues	$ 199,771	$ 124,287	$ 334,091	$ 256,066