CONSOLIDATED STATEMENTS OF INCOME (LOSS) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Income Statement [Abstract]
NET REVENUES	$ 347,089		$ 305,370		$ 298,739
COST OF REVENUES	163,853		154,868		158,093
GROSS PROFIT	183,236		150,502		140,646
OPERATING EXPENSES:
Research and development	51,654		45,709		40,295
Sales and marketing	45,466		37,998		32,624
General and administrative	32,050		30,243		24,508
Charge related to SemiSouth (Note 12)	0		25,200		0
Total operating expenses	129,170		139,150		97,427
INCOME FROM OPERATIONS	54,066		11,352		43,219
OTHER INCOME (EXPENSE):
Interest income	736		1,747		2,054
Interest expense	(23)		(2)		0
Charge related to SemiSouth (Note 12)	0		(33,745)		0
Other, net	648		(134)		(178)
Total other income (expense)	1,361		(32,134)		1,876
INCOME (LOSS) BEFORE PROVISION FOR (BENEFIT FROM) INCOME TAXES	55,427		(20,782)		45,095
PROVISION FOR (BENEFIT FROM) INCOME TAXES	(1,839)		13,622		10,804
NET INCOME (LOSS)	$ 57,266		$ (34,404)		$ 34,291
EARNINGS (LOSS) PER SHARE:
Basic (per share)	$ 1.95		$ (1.20)		$ 1.20
Diluted (per share)	$ 1.88	[1]	$ (1.20)	[1]	$ 1.14	[1]
SHARES USED IN PER SHARE CALCULATION:
Basic (in shares)	29,421		28,636		28,609
Diluted (in shares)	30,420	[1]	28,636	[1]	29,964	[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 included the shares underlying the 2013 and 2012 awards in the 2013 and 2012 calculations, respectively, as those shares were contingently issuable upon the satisfaction of the annual targets consisting of net revenue, non-GAAP operating earnings and achievement of strategic goals as of the end of the periods. The Company has excluded all performance-based awards underlying the 2011 awards in the 2011 calculation as the performance conditions for those awards were not met as of the end of the period.