Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenues	$ 331,306	$ 276,989	$ 650,754	$ 552,942
Costs and operating expenses:
Cost of revenues	107,457	89,647	210,023	178,715
Research and development	17,542	11,006	35,022	23,600
Sales and marketing	75,882	52,837	143,172	106,202
General and administrative	57,997	45,975	113,703	89,876
Amortization of other intangible assets	5,463	4,292	10,230	8,569
Restructuring (benefit) charge	(46)	0	14	0
Total costs and operating expenses	264,295	203,757	512,164	406,962
Income from operations	67,011	73,232	138,590	145,980
Interest income	1,622	3,021	3,255	5,972
Other income (expense), net	1,131	(107)	690	(1,142)
Gain on investments, net	4	75	17	84
Income before provision for income taxes	69,768	76,221	142,552	150,894
Provision for income taxes	25,529	28,300	55,086	52,356
Net income	$ 44,239	$ 47,921	$ 87,466	$ 98,538
Net income per weighted average share:
Basic (in dollars per share)	$ 0.25	$ 0.26	$ 0.49	$ 0.53
Diluted (in dollars per share)	$ 0.24	$ 0.25	$ 0.48	$ 0.52
Shares used in per share calculations:
Basic (in shares)	178,547	186,612	178,333	186,731
Diluted (in shares)	181,817	190,179	182,080	190,781