Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenue:
Software licenses	$ 104,477	$ 82,643	$ 297,780	$ 245,973
Maintenance and service	68,458	57,200	195,460	167,690
Total revenue	172,935	139,843	493,240	413,663
Cost of sales:
Software licenses	4,220	2,555	10,144	7,474
Amortization	8,993	8,180	23,993	24,572
Maintenance and service	17,814	14,544	51,535	42,026
Total cost of sales	31,027	25,279	85,672	74,072
Gross profit	141,908	114,564	407,568	339,591
Operating expenses:
Selling, general and administrative	43,180	36,954	123,786	108,161
Research and development	28,899	21,696	78,779	65,673
Amortization	4,500	4,037	12,587	11,874
Total operating expenses	76,579	62,687	215,152	185,708
Operating income	65,329	51,877	192,416	153,883
Interest expense	(753)	(902)	(2,330)	(3,696)
Interest income	789	491	2,196	1,281
Other income (expense), net	78	(574)	(544)	(942)
Income before income tax provision	65,443	50,892	191,738	150,526
Income tax provision	19,897	14,762	58,520	46,534
Net income	$ 45,546	$ 36,130	$ 133,218	$ 103,992
Earnings per share - basic:
Basic earnings per share	$ 0.49	$ 0.40	$ 1.45	$ 1.15
Weighted average shares - basic	92,277	90,880	91,995	90,486
Earnings per share - diluted:
Diluted earnings per share	$ 0.48	$ 0.39	$ 1.41	$ 1.12
Weighted average shares - diluted	94,445	93,212	94,268	93,044