Net (loss) income Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jul. 02, 2011	Jun. 30, 2012	Jul. 02, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Basic and diluted Net (loss) income	$ (12,542)	$ 13,031	$ (20,256)	$ 23,950
Shares used in basic Net (loss) income per share	117,874,000	118,047,000	118,024,000	118,021,000
Dilutive effect of stock options, RSUs and ESPP shares	0	3,421,000	0	3,674,000
Shares used in diluted Net (loss) income per share	117,874,000	121,468,000	118,024,000	121,695,000
Basic Net (loss) income per share	$ (0.11)	$ 0.11	$ (0.17)	$ 0.20
Diluted Net (loss) income per share	$ (0.11)	$ 0.11	$ (0.17)	$ 0.20
Stock options, RSU's and ESPP shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Aggregate antidilutive shares excluded from computation of diluted net (loss) income per share	12,200,000	4,000,000	12,200,000	3,600,000