Common Stock (Details) (USD $)	0 Months Ended				12 Months Ended
	Aug. 10, 2012	Feb. 22, 2012	Aug. 30, 2011	Jul. 06, 2010	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Share-Based Compensation
Share-based compensation expense					$ 2,900,000	$ 4,900,000	$ 5,700,000
Non-employee compensation expense					147,000	79,000	34,000
Employee tax withholdings paid on redemption of vested restricted shares					730,000	1,360,000	1,146,000
Common Stock Repurchases and Retirements
Share repurchase program, amount authorized to be repurchased	5,000,000	4,450,000	7,500,000	5,000,000
Number of shares repurchased and retired					118,968	466,109	398,372
Aggregate price of shares repurchased and retired					2,190,000	9,062,000	9,054,000
Amount available for future repurchases					1,400,000
Restricted shares
Share-Based Compensation
Vested (in shares)					134,384	216,528	164,086
Redemption of vested restricted shares in order to pay employee tax withholdings (in shares)					37,642	69,207	50,724
Employee tax withholdings paid on redemption of vested restricted shares					700,000	1,400,000	1,100,000
Employees and directors
Share-Based Compensation
Share-based compensation expense					$ 2,900,000	$ 4,900,000	$ 5,700,000