Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Deferred tax assets
Reserves and accruals	$ 31,208	$ 33,741	$ 19,876
Net operating loss carryovers	24,852	27,431	21,925
Depreciation and amortization	0	0	7,440
Research and development credit carryovers	13,500	12,136	14,930
Deferred stock-based compensation	6,643	6,063	4,703
Other tax credits	2,764	2,813	3,883
Other	0	0	292
Total deferred tax assets	78,967	82,184	73,049
Valuation allowance	(28,354)	(26,557)	(18,025)
Net deferred tax assets	50,613	55,627	55,024
Deferred tax liabilities
Depreciation and amortization	(5,434)	(3,320)	0
Intangibles	(17,668)	(26,172)	(7,331)
Other	(135)	(1,066)	0
Net deferred tax liabilities	$ (23,237)	$ (30,558)	$ (7,331)