Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Condensed Consolidated Statements Of Operations [Abstract]
Revenues	$ 106,179	$ 108,305	$ 310,738	$ 333,803
Cost of sales:
Cost of goods sold	34,236	40,773	115,570	115,963
Amortization of intangible assets	8,087	7,594	23,029	13,094
Total cost of sales	42,323	48,367	138,599	129,057
Gross profit	63,856	59,938	172,139	204,746
Operating expenses:
Research and development	23,772	24,094	72,965	68,666
Sales and marketing	16,951	20,192	55,673	55,858
General and administrative	11,738	13,219	35,971	39,176
Amortization of intangible assets	1,779	1,613	5,329	2,864
Restructuring and other	5,191	0	28,532	0
Acquisition-related expenses	0	407	0	2,891
Total operating expenses	59,431	59,525	198,470	169,455
Income (loss) from operations	4,425	413	(26,331)	35,291
Other income (expense), net	(1,112)	(1,073)	(2,760)	(2,932)
Income (loss) before income taxes	3,313	(660)	(29,091)	32,359
Provision for (benefit from) income taxes	2,551	(526)	(7,393)	9,353
Net income (loss)	$ 762	$ (134)	$ (21,698)	$ 23,006
Earnings (loss) per share:
Basic	$ 0.01	$ 0.00	$ (0.31)	$ 0.34
Diluted	$ 0.01	$ 0.00	$ (0.31)	$ 0.33
Weighted average number of shares outstanding:
Basic	69,215	68,526	69,013	68,179
Diluted	69,360	68,526	69,013	68,856