Consolidated Statements of Operations (USD $) Share data in Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues	$ 281,856,000	$ 253,551,000	$ 834,798,000	$ 738,898,000
Costs and operating expenses:
Cost of revenues	93,284,000	77,812,000	271,999,000	217,126,000
Research and development	13,542,000	14,235,000	37,142,000	40,991,000
Sales and marketing	54,520,000	55,603,000	160,722,000	160,474,000
General and administrative	50,834,000	42,729,000	140,710,000	125,986,000
Amortization of other intangible assets	4,200,000	4,100,000	12,800,000	12,400,000
Restructuring charge	158,000	0	158,000	0
Total costs and operating expenses	216,523,000	194,509,000	623,485,000	556,967,000
Income from operations	65,333,000	59,042,000	211,313,000	181,931,000
Interest income	2,703,000	2,809,000	8,675,000	9,321,000
Interest expense	0	(222,000)	0	(1,549,000)
Other expense, net	(188,000)	(1,366,000)	(1,330,000)	(1,319,000)
Gain on investments, net	299,000	49,000	383,000	297,000
Loss on early extinguishment of debt	0	0	0	(294,000)
Income before provision for income taxes	68,147,000	60,312,000	219,041,000	188,387,000
Provision for income taxes	25,862,000	20,603,000	78,218,000	69,677,000
Net income	$ 42,285,000	$ 39,709,000	$ 140,823,000	$ 118,710,000
Net income per weighted average share:
Basic	$ 0.23	$ 0.22	$ 0.76	$ 0.68
Diluted	$ 0.23	$ 0.21	$ 0.74	$ 0.63
Shares used in per share calculations:
Basic	183,085	181,457	185,515	175,292
Diluted	185,704	191,271	189,089	190,254