CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
NET REVENUES	$ 87,922		$ 76,382		$ 164,962		$ 148,155
COST OF REVENUES	41,715		38,627		78,891		75,807
GROSS PROFIT	46,207		37,755		86,071		72,348
OPERATING EXPENSES:
Research and development	13,489		12,066		25,761		22,706
Sales and marketing	11,364		9,176		22,145		17,315
General and administrative	8,066		7,100		15,800		14,193
Total operating expenses	32,919		28,342		63,706		54,214
INCOME FROM OPERATIONS	13,288		9,413		22,365		18,134
OTHER INCOME
Other income, net	565		195		782		810
Total other income	565		195		782		810
INCOME BEFORE PROVISION FOR (BENEFIT FROM) INCOME TAXES	13,853		9,608		23,147		18,944
PROVISION FOR (BENEFIT FROM) INCOME TAXES	181		16,784		(1,428)		18,659
NET INCOME (LOSS)	$ 13,672		$ (7,176)		$ 24,575		$ 285
EARNINGS (LOSS) PER SHARE:
Basic	$ 0.47		$ (0.25)		$ 0.85		$ 0.01
Diluted	$ 0.45	[1]	$ (0.25)	[1]	$ 0.82	[1]	$ 0.01	[1]
SHARES USED IN PER SHARE CALCULATION:
Basic	29,178		28,619		28,967		28,423
Diluted	30,158	[1]	28,619	[1]	29,977	[1]	29,624	[1]

[1] The Company includes the shares underlying performance-based awards in the calculation of diluted earnings per share if the performance conditions have been satisfied as of the end of the reporting period and excludes such shares when the necessary conditions have not been met. The Company has excluded the shares underlying the 2013 and 2012 awards in the 2013 and 2012 calculation, respectively, as those shares were not contingently issuable as of the end of the period.