Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue:
Software license	$ 78,615	$ 71,583	$ 62,416
Services	428,078	376,023	315,901
Hardware and other	49,678	44,498	36,201
Total revenue	556,371	492,104	414,518
Costs and expenses:
Cost of license	9,938	7,110	8,724
Cost of services	184,349	169,140	142,236
Cost of hardware and other	41,141	36,328	30,191
Research and development	53,859	48,953	44,549
Sales and marketing	48,615	52,617	44,559
General and administrative	49,259	44,455	37,147
Depreciation and amortization	7,764	6,377	5,825
Total costs and expenses	394,925	364,980	313,231
Operating income	161,446	127,124	101,287
Interest income	1,331	1,268	1,167
Other income (loss), net	64	(394)	655
Income before income taxes	162,841	127,998	103,109
Income tax provision	59,366	45,998	35,813
Net income	$ 103,475	$ 82,000	$ 67,296
Basic earnings per share	$ 1.41	$ 1.09	$ 0.88
Diluted earnings per share	$ 1.40	$ 1.08	$ 0.86
Weighted average number of shares:
Basic	73,443	74,995	76,664
Diluted	74,038	75,841	77,932