Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Software licenses and royalties	$ 59,008	$ 49,065	$ 40,841
Subscriptions	111,933	87,848	61,864
Software services	139,852	113,821	93,267
Maintenance	245,537	212,696	191,720
Appraisal services	25,065	21,802	20,825
Hardware and other	9,627	7,869	8,126
Total revenues	591,022	493,101	416,643
Cost of revenues:
Software licenses and royalties	1,632	1,900	2,377
Acquired software	4,440	1,858	2,078
Software services, maintenance and subscriptions	285,340	236,363	199,617
Appraisal services	15,922	14,284	13,809
Hardware and other	6,501	5,325	5,559
Total cost of revenues	313,835	259,730	223,440
Gross profit	277,187	233,371	193,203
Selling, general and administrative expenses	133,317	108,260	98,289
Research and development expense	29,922	25,743	23,269
Amortization of customer and trade name intangibles	10,300	6,400	6,800
Operating income	108,043	94,822	67,128
Other income (expense), net	381	(355)	(1,309)
Income before income taxes	108,424	94,467	65,819
Income tax provision	43,555	35,527	26,718
Net income	$ 64,869	$ 58,940	$ 39,101
Earnings per common share:
Basic	$ 1.90	$ 1.79	$ 1.23
Diluted	$ 1.77	$ 1.66	$ 1.13
Unrealized gains on investment securities available-for-sale			$ 341
Income tax benefit related to components of other comprehensive income			119
Other comprehensive income, net of tax			222
Comprehensive income	$ 64,869	$ 58,940	39,323
Customer and trade name intangibles [Member]
Cost of revenues:
Amortization of customer and trade name intangibles	$ 5,905	$ 4,546	$ 4,517