CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
NET REVENUES	$ 80,184		$ 79,858		$ 156,946		$ 151,365
COST OF REVENUES	42,558		38,369		82,897		73,954
GROSS PROFIT	37,626		41,489		74,049		77,411
OPERATING EXPENSES:
Research and development	10,195		8,674		20,218		16,785
Sales and marketing	8,104		7,527		16,352		14,447
General and administrative	6,141		6,465		12,616		12,478
Total operating expenses	24,440		22,666		49,186		43,710
INCOME FROM OPERATIONS	13,186		18,823		24,863		33,701
OTHER INCOME
Other income, net	461		471		903		965
Total other income	461		471		903		965
INCOME BEFORE PROVISION FOR INCOME TAXES	13,647		19,294		25,766		34,666
PROVISION FOR INCOME TAXES	3,048		3,707		5,313		6,765
NET INCOME	$ 10,599		$ 15,587		$ 20,453		$ 27,901
EARNINGS PER SHARE:
Basic	$ 0.37		$ 0.56		$ 0.71		$ 1.01
Diluted	$ 0.35	[1]	$ 0.53	[1]	$ 0.68	[1]	$ 0.95	[1]
SHARES USED IN PER SHARE CALCULATION:
Basic	28,938		27,844		28,784		27,658
Diluted	30,346	[1]	29,535	[1]	30,271	[1]	29,460	[1]

[1] The Company includes the shares underlying performance-based awards in the calculation of diluted earnings per share when they become contingently issuable per ASC 260-10, Earnings per Share and excludes such shares when they are not contingently issuable. The Company has excluded all performance-based awards underlying the fiscal 2011 and 2010 awards as those shares are not contingently issuable as of the end of the period.