CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues:
Total revenues	$ 275,400	$ 236,067	$ 797,590	$ 693,301
Cost of revenues:
Total cost of revenues	144,683	124,441	422,965	369,594
Gross profit	130,717	111,626	374,625	323,707
Selling, general and administrative expenses	63,888	52,605	187,481	152,471
Research and development expense	21,130	17,050	60,172	45,929
Amortization of other intangibles	5,646	4,386	15,762	11,742
Operating income	40,053	37,585	111,210	113,565
Other income, net	499	1,041	838	2,198
Income before income taxes	40,552	38,626	112,048	115,763
Income tax provision (benefit)	162	(298)	12,311	(147)
Net income	$ 40,390	$ 38,924	$ 99,737	$ 115,910
Earnings per common share:
Basic (usd per share)	$ 1.04	$ 1.00	$ 2.58	$ 3.01
Diluted (usd per share)	$ 1.00	$ 0.96	$ 2.49	$ 2.87
Software licenses and royalties
Revenues:
Total revenues	$ 25,379	$ 22,444	$ 67,847	$ 67,620
Cost of revenues:
Total cost of revenues	971	957	2,680	2,939
Subscriptions
Revenues:
Total revenues	75,272	58,699	216,022	160,736
Acquired software
Cost of revenues:
Total cost of revenues	7,975	5,897	22,645	17,003
Software services
Revenues:
Total revenues	54,997	48,199	160,841	144,812
Software services, maintenance and subscriptions
Cost of revenues:
Total cost of revenues	128,545	111,508	371,464	327,080
Maintenance
Revenues:
Total revenues	109,833	96,215	316,674	286,188
Appraisal services
Revenues:
Total revenues	6,008	5,544	17,455	16,470
Cost of revenues:
Total cost of revenues	4,096	3,505	11,306	10,854
Hardware and other
Revenues:
Total revenues	3,911	4,966	18,751	17,475
Cost of revenues:
Total cost of revenues	$ 3,096	$ 2,574	$ 14,870	$ 11,718