Comprehensive Loss - Components of Reclassifications of Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other gain (loss), net:	$ (444)	$ (617)	$ (805)	$ (892)
Provision for income taxes	(308)	(434)	(1,240)	(1,540)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gain on Auction Rate Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other gain (loss), net:			(166)
Provision for income taxes			0
Total, net of income tax			$ (166)