Debt (Components Of Convertible Senior Notes) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010	Dec. 31, 2010
Debt
Debt principal	$ 190,000		$ 190,000		$ 190,000
Unamortized debt discount	40,127		40,127		45,941
Net carrying amount of the convertible debt	149,873		149,873		144,059
Contractual interest expense	2,138	2,138	4,346	4,371
Amortization of the discount component and debt issue fees	3,160	2,783	6,221	5,480
Total interest expense on the convertible debt	$ 5,298	$ 4,921	$ 10,567	$ 9,851