Valuation and Qualifying Accounts (Details) (Allowance for Doubtful Accounts [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Jan. 01, 2012	Jan. 02, 2011
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts
Valuation and qualifying accounts, beginning balance	$ 2,426	$ 1,281	$ 429
Valuation and qualifying accounts, charged to cost and expenses	757	1,812	905
Valuation and qualifying accounts, charged to other accounts	(1)	3	0
Valuation and qualifying accounts, Deductions, actual charge-offs	(635)	(670)	(53)
Valuation and qualifying accounts, ending balance	$ 2,546	$ 2,426	$ 1,281