Senior Convertible Notes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 26, 2010
Senior Convertible Notes [Abstract]
Debt instrument, principal amount	$ 225,000,000
Debt instrument, stated interest rate	2.25%	2.25%
Debt instrument, maturity date	Oct. 15, 2025	Oct. 15, 2025
Date of first required payment	Apr. 15, 2006
Debt instrument earliest call date	Oct. 20, 2012
Percentage of stock price required in converting debt	120.00%
Initial conversion price	$ 8.80
Debt instrument convertible base conversion value which requires additional cash and or stock payment	1,000
Convertible debt conversion ratio	113.6687
Amount of convertible debt instrument base conversion value that company will pay in cash	1,000
Maximum rate of accrued damages	0.50%
Convertible debt instrument, carrying amount of equity component		35,200,000	35,200,000
Carrying value of debt component		65,100,000	61,600,000
Principal amount		68,300,000	68,300,000
Debt instrument, unamortized discount		3,200,000	6,700,000
Deferred debt issue costs		$ 200,000	$ 400,000