Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements of Operations [Abstract]
Product revenue	$ 477,346	$ 370,783	$ 280,009
Service revenue	71,986	52,561	39,557
Net revenue	549,332	423,344	319,566
Product cost of revenue	266,233	210,864	170,734
Service cost of revenue	28,585	17,079	14,472
Total cost of revenue	294,818	227,943	185,206
Gross profit	254,514	195,401	134,360
Operating expenses:
Research and development	102,732	77,197	61,435
Selling, general and administrative	131,091	108,150	81,138
Amortization of intangibles	8,918	4,912	3,822
Total operating expenses	242,741	190,259	146,395
Income (loss) from operations	11,773	5,142	(12,035)
Interest income, net	374	1,082	3,181
Other expense, net	(514)	(785)	(881)
Income (loss) before income taxes	11,633	5,439	(9,735)
Provision for income taxes	2,854	9,774	14,404
Net income (loss)	$ 8,779	$ (4,335)	$ (24,139)
Net Income (loss) per share:
Basic	$ 0.08	$ (0.04)	$ (0.25)
Diluted	$ 0.08	$ (0.04)	$ (0.25)
Weighted average shares:
Basic	115,175	101,487	95,833
Diluted	116,427	101,487	95,833