CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue:
Software licenses	$ 110,046	$ 141,908
Maintenance and service	172,827	111,497
Total revenue	282,873	253,405
Cost of sales:
Software licenses	3,911	9,277
Amortization	8,786	8,936
Maintenance and service	26,341	18,818
Total cost of sales	39,038	37,031
Gross profit	243,835	216,374
Operating expenses:
Selling, general and administrative	87,809	73,417
Research and development	57,530	54,378
Amortization	3,435	3,107
Total operating expenses	148,774	130,902
Operating income	95,061	85,472
Interest income	2,285	1,249
Other expense, net	(308)	(1,154)
Income before income tax provision	97,038	85,567
Income tax provision	12,758	22,261
Net income	$ 84,280	$ 63,306
Earnings per share - basic:
Earnings per share	$ 1.00	$ 0.74
Weighted average shares	83,931	85,456
Earnings per share - diluted:
Earnings per share	$ 0.98	$ 0.73
Weighted average shares	86,152	87,224