CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues:
Total revenues	$ 275,124	$ 236,060	$ 522,190	$ 457,234
Cost of revenues:
Total cost of revenues	147,264	126,784	278,282	245,153
Gross profit	127,860	109,276	243,908	212,081
Selling, general and administrative expenses	65,827	52,262	123,593	99,866
Research and development expense	20,101	15,831	39,042	28,879
Amortization of other intangibles	5,266	4,041	10,116	7,356
Operating income	36,666	37,142	71,157	75,980
Other (expense) income, net	(247)	558	339	1,157
Income before income taxes	36,419	37,700	71,496	77,137
Income tax provision (benefit)	4,420	(1,461)	12,149	151
Net income	$ 31,999	$ 39,161	$ 59,347	$ 76,986
Earnings per common share:
Basic (usd per share)	$ 0.83	$ 1.02	$ 1.54	$ 2.00
Diluted (usd per share)	$ 0.80	$ 0.97	$ 1.49	$ 1.91
Software licenses and royalties
Revenues:
Total revenues	$ 20,675	$ 22,400	$ 42,468	$ 45,176
Cost of revenues:
Total cost of revenues	891	1,204	1,709	1,982
Subscriptions
Revenues:
Total revenues	73,475	53,009	140,750	102,037
Acquired software
Cost of revenues:
Total cost of revenues	7,988	5,724	14,670	11,106
Software services
Revenues:
Total revenues	57,401	50,674	105,844	96,613
Software services, maintenance and subscriptions
Cost of revenues:
Total cost of revenues	125,759	109,487	242,919	215,572
Maintenance
Revenues:
Total revenues	106,689	96,076	206,841	189,973
Appraisal services
Revenues:
Total revenues	6,233	5,532	11,447	10,926
Cost of revenues:
Total cost of revenues	3,758	3,568	7,210	7,349
Hardware and other
Revenues:
Total revenues	10,651	8,369	14,840	12,509
Cost of revenues:
Total cost of revenues	$ 8,868	$ 6,801	$ 11,774	$ 9,144