Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues:
Software licenses and royalties	$ 74,306	$ 59,008	$ 49,065
Subscriptions	142,704	111,933	87,848
Software services	174,804	139,852	113,821
Maintenance	322,969	245,537	212,696
Appraisal services	26,287	25,065	21,802
Hardware and other	14,973	9,627	7,869
Total revenues	756,043	591,022	493,101
Cost of revenues:
Software licenses and royalties	2,964	1,632	1,900
Acquired software	22,235	4,440	1,858
Software services, maintenance and subscriptions	348,939	285,340	236,363
Appraisal services	16,411	15,922	14,284
Hardware and other	10,143	6,501	5,325
Total cost of revenues	400,692	313,835	259,730
Gross profit	355,351	277,187	233,371
Selling, general and administrative expenses	167,161	133,317	108,260
Research and development expense	43,154	29,922	25,743
Amortization of customer and trade name intangibles	36,400	10,300	6,400
Operating income	131,305	108,043	94,822
Other (expense) income, net	(1,998)	381	(355)
Income before income taxes	129,307	108,424	94,467
Income tax provision	19,450	43,555	35,527
Net income	$ 109,857	$ 64,869	$ 58,940
Earnings per common share:
Basic (USD per share)	$ 3.01	$ 1.90	$ 1.79
Diluted (USD per share)	$ 2.82	$ 1.77	$ 1.66
Customer and trade name intangibles
Cost of revenues:
Amortization of customer and trade name intangibles	$ 13,731	$ 5,905	$ 4,546