CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue:
Total revenue	$ 366,965	$ 343,899	$ 1,057,611	$ 1,029,664
Cost of sales:
Amortization	9,911	4,762	29,227	14,064
Total cost of sales	53,385	41,365	157,361	116,677
Gross profit	313,580	302,534	900,250	912,987
Operating expenses:
Selling, general and administrative	132,642	120,682	391,862	353,263
Research and development	86,616	73,018	258,861	219,058
Amortization	4,237	3,787	12,562	11,342
Total operating expenses	223,495	197,487	663,285	583,663
Operating income	90,085	105,047	236,965	329,324
Interest income	754	3,188	4,463	9,610
Interest expense	(1,853)	(239)	(8,544)	(561)
Other income (expense), net	1,158	833	3,169	(937)
Income before income tax provision	90,144	108,829	236,053	337,436
Income tax provision	14,517	19,366	17,798	51,993
Net income	$ 75,627	$ 89,463	$ 218,255	$ 285,443
Earnings per share - basic:
Earnings per share	$ 0.88	$ 1.06	$ 2.55	$ 3.40
Weighted average shares	85,798	84,109	85,749	83,951
Earnings per share - diluted:
Earnings per share	$ 0.87	$ 1.04	$ 2.50	$ 3.34
Weighted average shares	87,224	85,733	87,176	85,570
Software licenses
Revenue:
Total revenue	$ 141,622	$ 137,144	$ 398,793	$ 430,687
Cost of sales:
Total cost of sales	7,251	5,708	20,688	16,620
Maintenance and service
Revenue:
Total revenue	225,343	206,755	658,818	598,977
Cost of sales:
Total cost of sales	$ 36,223	$ 30,895	$ 107,446	$ 85,993