CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue:
Total revenue	$ 1,515,892	$ 1,293,636	$ 1,095,250
Cost of sales:
Amortization	21,710	27,034	36,794
Total cost of sales	166,273	155,885	150,164
Gross profit	1,349,619	1,137,751	945,086
Operating expenses:
Selling, general and administrative	521,200	413,580	338,640
Research and development	298,210	233,802	202,746
Amortization	15,169	13,795	12,972
Total operating expenses	834,579	661,177	554,358
Operating income	515,040	476,574	390,728
Interest income	12,796	11,419	6,962
Interest expense	(3,461)	(59)	(86)
Other expense, net	(1,792)	(849)	(1,910)
Income before income tax provision	522,583	487,085	395,694
Income tax provision	71,288	67,710	136,443
Net income	$ 451,295	$ 419,375	$ 259,251
Earnings per share – basic:
Earnings per share	$ 5.36	$ 4.99	$ 3.05
Weighted average shares	84,259	83,973	84,988
Earnings per share – diluted:
Earnings per share	$ 5.25	$ 4.88	$ 2.98
Weighted average shares	85,925	85,913	86,854
Software licenses
Revenue:
Total revenue	$ 699,630	$ 576,717	$ 624,964
Cost of sales:
Total cost of sales	23,944	18,619	34,421
Maintenance and service
Revenue:
Total revenue	816,262	716,919	470,286
Cost of sales:
Total cost of sales	$ 120,619	$ 110,232	$ 78,949