Net Income Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Earnings Per Share [Abstract]
Basic and diluted Net income	$ 9,406	$ 8,844	$ 33,161	$ 15,774
Shares used in basic Net income per share (in shares)	118,643,000	116,055,000	117,661,000	115,730,000
Dilutive effect of stock options, RSUs and ESPP shares (in shares)	2,327,000	1,294,000	2,788,000	1,363,000
Shares used in diluted Net income per share (in shares)	120,970,000	117,349,000	120,449,000	117,093,000
Basic Net income per share (in dollars per share)	$ 0.08	$ 0.08	$ 0.28	$ 0.14
Diluted Net income per share (in dollars per share)	$ 0.08	$ 0.08	$ 0.28	$ 0.13
Stock options, RSU's and ESPP shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of EPS (in shares)	2,700,000	8,600,000	2,400,000	8,500,000