Debt (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Convertible Senior Notes Due 2013 [Member]
Effective interest rate and components of interest expense
Effective interest rate	6.40%
Contractual interest expense	$ 2,159
Amortization of debt discount	6,272
Total Interest Expense	8,431
Convertible Senior Notes Due 2011 and 2013 [Member]
Effective interest rate and components of interest expense
Effective interest rate		6.30%	6.30%
Contractual interest expense		4,119	5,579
Amortization of debt discount		12,654	16,055
Total Interest Expense		16,773	21,634
Convertible Senior Notes Due Twenty-Fifteen [Member]
Effective interest rate and components of interest expense
Effective interest rate	8.10%	8.10%	8.10%
Contractual interest expense	9,157	9,157	5,005
Amortization of debt discount	14,758	13,665	7,035
Total Interest Expense	$ 23,915	$ 22,822	$ 12,040