Schedule II-Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2012	Dec. 30, 2011	Dec. 31, 2010
Allowances for Doubtful Accounts [Member]
Movement in Valuation and Reserves [Roll Forward]
Opening Balance	$ 634	$ 941	$ 1,377
Additions Charged to Costs and Expenses	89	28	128
Additions Charged to Other Accounts	0	0	0
Deductions	(475)	(335)	(564)
Ending Balance	248	634	941
Valuation Allowance on Deferred Tax Assets [Member]
Movement in Valuation and Reserves [Roll Forward]
Opening Balance	67,556	15,086	11,481
Additions Charged to Costs and Expenses	49,146	32,452	4,650
Additions Charged to Other Accounts	3,745	20,394	0
Deductions	(75,750)	(376)	(1,045)
Ending Balance	$ 44,697	$ 67,556	$ 15,086