Consolidated Statements Of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Consolidated Statements Of Operations [Abstract]
Revenue	$ 591,556		$ 504,007		$ 401,108
Cost of revenue	260,573	[1]	236,322	[1]	189,625	[1]
Gross profit	330,983		267,685		211,483
Operating expenses:
Research and development	115,901	[1]	105,769	[1]	110,822	[1]
Sales and marketing	119,487	[1]	107,322	[1]	102,001	[1]
General and administrative	53,756	[1]	38,185	[1]	35,033	[1]
Amortization of identified intangibles	11,248		12,385		18,479
Restructuring and other (Note 14)	3,258		3,615		8,957
Asset impairment			685		3,208
Total operating expenses	303,650		267,961		278,500
Income (loss) from operations	27,333		(276)		(67,017)
Other income (expense), net:
Interest and other income (expense), net:	3,087		(1,354)		3,061
Gain on sale of building and land					79,991
Total other income (expense), net	3,087		(1,354)		83,052
Income (loss) before income taxes	30,420		(1,630)		16,035
Benefit from (provision for) income taxes	(2,955)		9,117		(18,206)
Net income (loss)	$ 27,465		$ 7,487		$ (2,171)
Net income (loss) per basic common share	$ 0.59		$ 0.16		$ (0.04)
Net income (loss) per diluted common share	$ 0.58		$ 0.16		$ (0.04)
Shares used in basic per-share calculation	46,234		45,387		49,682
Shares used in diluted per-share calculation	47,579		47,152		49,682

[1] Includes stock-based compensation expense as follows: 2011 2010 2009 Cost of revenue $ 1,664 $ 984 $ 1,074 Research and development 5,724 4,114 6,664 Sales and marketing 4,133 3,695 4,233 General and administrative 11,848 7,132 6,613