CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue:
Total revenue	$ 317,130	$ 282,873
Cost of sales:
Amortization	4,547	8,786
Total cost of sales	34,815	39,038
Gross profit	282,315	243,835
Operating expenses:
Selling, general and administrative	112,169	87,809
Research and development	70,738	57,530
Amortization	3,759	3,435
Total operating expenses	186,666	148,774
Operating income	95,649	95,061
Interest income	3,442	2,285
Other expense, net	(425)	(308)
Income before income tax provision	98,666	97,038
Income tax provision	12,436	12,758
Net income	$ 86,230	$ 84,280
Earnings per share - basic:
Earnings per share	$ 1.03	$ 1.00
Weighted average shares	83,764	83,931
Earnings per share - diluted:
Earnings per share	$ 1.01	$ 0.98
Weighted average shares	85,493	86,152
Software licenses
Revenue:
Total revenue	$ 123,044	$ 110,046
Cost of sales:
Total cost of sales	4,708	3,911
Maintenance and service
Revenue:
Total revenue	194,086	172,827
Cost of sales:
Total cost of sales	$ 25,560	$ 26,341