Debt (Components Of Convertible Senior Notes) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 01, 2012	Apr. 03, 2011	Dec. 31, 2011
Debt [Abstract]
Debt principal	$ 190,000		$ 190,000
Unamortized debt discount	30,627		33,902
Net carrying amount of the convertible debt	159,373		156,098
Contractual interest expense	2,161	2,209
Amortization of the discount component and debt issue fees	3,479	3,061
Total interest expense on the convertible debt	$ 5,640	$ 5,270