Basic and Diluted Net Income (Loss) Per Common Share Basic and Diluted Net Income (Loss) Per Common Share - Computation of Net Loss Per Common Share Basic and Diluted (Details) (USD $) In Thousands, except Per 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]
Net income (loss)	$ 4,843	$ 3,347	$ 5,249	$ (21,941)
Basic weighted average common shares outstanding (in shares)	124,378	118,740	122,953	116,653
Employee equity plans (in shares)	4,586	5,939	4,109	0
Diluted weighted average common shares outstanding (in shares)	128,964	124,679	127,062	116,653
Net income (loss) per common share
Basic (USD per share)	$ 0.04	$ 0.03	$ 0.04	$ (0.19)
Diluted (USD per share)	$ 0.04	$ 0.03	$ 0.04	$ (0.19)