CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue:
Software licenses	$ 149,880	$ 141,087	$ 291,788	$ 267,138
Maintenance and service	114,044	104,982	225,541	204,837
Total revenue	263,924	246,069	517,329	471,975
Cost of sales:
Software licenses	7,525	6,534	16,802	13,272
Amortization	8,952	9,520	17,888	19,031
Maintenance and service	19,861	20,957	38,679	39,993
Total cost of sales	36,338	37,011	73,369	72,296
Gross profit	227,586	209,058	443,960	399,679
Operating expenses:
Selling, general and administrative	77,051	64,259	150,468	122,028
Research and development	49,002	47,443	103,380	92,115
Amortization	3,139	3,201	6,246	6,359
Total operating expenses	129,192	114,903	260,094	220,502
Operating income	98,394	94,155	183,866	179,177
Interest income	1,668	1,077	2,917	2,027
Other (expense) income, net	(190)	246	(1,344)	52
Income before income tax provision	99,872	95,478	185,439	181,256
Income tax provision	30,142	25,850	52,403	55,160
Net income	$ 69,730	$ 69,628	$ 133,036	$ 126,096
Earnings per share - basic:
Earnings per share	$ 0.82	$ 0.79	$ 1.56	$ 1.43
Weighted average shares	85,167	87,638	85,311	87,876
Earnings per share - diluted:
Earnings per share	$ 0.80	$ 0.78	$ 1.53	$ 1.41
Weighted average shares	86,895	89,305	87,060	89,694