Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net sales:
Product	$ 267,894	$ 247,256	$ 776,208	$ 699,007
Software maintenance	22,080	20,839	65,809	60,222
GSA accrual		(13,107)	1,349	(13,107)
Total net sales	289,974	254,988	843,366	746,122
Cost of sales:
Product	71,796	63,579	201,374	169,340
Software maintenance	1,698	1,636	4,319	4,237
Total cost of sales	73,494	65,215	205,693	173,577
Gross profit	216,480	189,773	637,673	572,545
Operating expenses:
Sales and marketing	109,213	103,195	320,021	286,547
Research and development	56,627	54,674	164,928	144,569
General and administrative	20,714	21,148	63,590	61,219
Total operating expenses	186,554	179,017	548,539	492,335
Operating income	29,926	10,756	89,134	80,210
Other income:
Interest income	133	354	495	1,039
Net foreign exchange (loss)	(235)	(708)	(2,139)	(1,417)
Other income (expense), net	(899)	(95)	(644)	(220)
Income before income taxes	28,925	10,307	86,846	79,612
Provision for (benefit from) income taxes	4,585	(2,429)	17,423	9,867
Net income	$ 24,340	$ 12,736	$ 69,423	$ 69,745
Basic earnings per share	$ 0.20	$ 0.11	$ 0.57	$ 0.58
Weighted average shares outstanding - basic	122,402	120,308	121,710	119,585
Diluted earnings per share	$ 0.20	$ 0.11	$ 0.57	$ 0.58
Weighted average shares outstanding - diluted	123,074	121,102	122,726	121,027
Dividends declared per share	$ 0.14	$ 0.10	$ 0.42	$ 0.30