Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Oct. 01, 2011	Jul. 02, 2011	Apr. 02, 2011	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 65,875	$ 70,889	$ 70,792	$ 71,700	$ 70,170	$ 81,720	$ 83,861	$ 82,615	$ 279,256	$ 318,366	$ 297,768
Gross margin	35,673	38,548	37,051	39,485	40,463	47,854	50,671	49,609
Restructuring charges (adjustment)	5,375	0	87	556	1,097	1,760	1,387	1,835	6,018	6,079	11
Net (loss) income	$ (7,175)	$ (2,175)	$ (12,542)	$ (7,714)	$ 40,945	$ 13,337	$ 13,031	$ 10,919	$ (29,606)	$ 78,232	$ 57,072
Basic net (loss) income per share (in dollars per share)	$ (0.06)	$ (0.02)	$ (0.11)	$ (0.07)	$ 0.35	$ 0.11	$ 0.11	$ 0.09	$ (0.25)	$ 0.66	$ 0.49
Diluted net (loss) income per share (in dollars per share)	$ (0.06)	$ (0.02)	$ (0.11)	$ (0.07)	$ 0.34	$ 0.11	$ 0.11	$ 0.09	$ (0.25)	$ 0.65	$ 0.48