Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 89,519	$ 87,154	$ 84,694	$ 71,158	$ 65,875	$ 70,889	$ 70,792	$ 71,700	$ 332,525	$ 279,256	$ 318,366
Gross margin	48,603	46,376	45,110	38,155	35,673	38,548	37,051	39,485
Restructuring charges (adjustment)	131	85	19	153	5,375	0	87	556	388	6,018	6,079
Net income (loss)	$ 6,547	$ 8,844	$ 5,040	$ 1,890	$ (7,175)	$ (2,175)	$ (12,542)	$ (7,714)	$ 22,321	$ (29,606)	$ 78,232
Basic net (loss) income per share (in dollars per share)	$ 0.06	$ 0.08	$ 0.04	$ 0.02	$ (0.06)	$ (0.02)	$ (0.11)	$ (0.07)	$ 0.19	$ (0.25)	$ 0.66
Diluted net (loss) income per share (in dollars per share)	$ 0.06	$ 0.08	$ 0.04	$ 0.02	$ (0.06)	$ (0.02)	$ (0.11)	$ (0.07)	$ 0.19	$ (0.25)	$ 0.65