CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenue:
Software licenses	$ 139,530	$ 140,197	$ 406,668	$ 405,655
Maintenance and service	106,332	97,643	311,169	285,451
Total revenue	245,862	237,840	717,837	691,106
Cost of sales:
Software licenses	6,433	6,889	19,705	21,048
Amortization	9,513	9,818	28,544	28,918
Maintenance and service	19,640	19,874	59,633	60,288
Total cost of sales	35,586	36,581	107,882	110,254
Gross profit	210,276	201,259	609,955	580,852
Operating expenses:
Selling, general and administrative	61,537	61,367	183,565	181,640
Research and development	45,418	44,784	137,533	127,439
Amortization	3,222	4,925	9,581	15,037
Total operating expenses	110,177	111,076	330,679	324,116
Operating income	100,099	90,183	279,276	256,736
Interest expense	(30)	(95)	(175)	(371)
Interest income	1,083	674	3,110	2,125
Other (expense) income, net	(159)	(383)	38	475
Income before income tax provision	100,993	90,379	282,249	258,965
Income tax provision	31,436	24,346	86,596	74,465
Net income	$ 69,557	$ 66,033	$ 195,653	$ 184,500
Earnings per share - basic:
Earnings per share	$ 0.80	$ 0.74	$ 2.23	$ 2.05
Weighted average shares	86,959	89,694	87,570	89,873
Earnings per share - diluted:
Earnings per share	$ 0.78	$ 0.72	$ 2.19	$ 2.01
Weighted average shares	88,676	91,593	89,355	91,820