Segment Information Segment Information - Largest Customer (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 30, 2011	Dec. 31, 2010
Revenue, Major Customer [Line Items]
Entity-wide revenue, major customer, percentage	13.30%	11.10%	11.30%
Entity wide revenue major customer accounts receivable balance	$ 6.2
Maximum [Member]
Revenue, Major Customer [Line Items]
Entity-wide revenue, major customer, percentage	10.00%