Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Condensed Consolidated Statements of Operations [Abstract]
NET REVENUES	$ 61,151		$ 67,494
COST OF REVENUES	27,975	[1]	29,645	[1]
GROSS PROFIT	33,176		37,849
OPERATING EXPENSES:
Research and development	13,324	[1]	12,521	[1]
Selling, general and administrative	11,160	[1]	12,091	[1]
Total operating expenses	24,484		24,612
INCOME FROM OPERATIONS	8,692		13,237
OTHER INCOME (EXPENSE):
Interest income	201		190
Interest expense	(5)		(16)
Other income, net	0		39
Total other income, net	196		213
INCOME BEFORE INCOME TAXES	8,888		13,450
PROVISION FOR INCOME TAXES	3,472		4,385
NET INCOME	$ 5,416		$ 9,065
NET INCOME PER SHARE:
Basic	$ 0.09		$ 0.15
Diluted	$ 0.09		$ 0.14
CASH DIVIDENDS DECLARED PER SHARE	$ 0.040		$ 0.035
WEIGHTED AVERAGE SHARES USED IN COMPUTING PER SHARE AMOUNTS:
Basic	60,855		61,845
Diluted	61,639		63,078

[1] Share-based compensation expense included in: