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Convertible Notes (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 29, 2012 Convertible Senior Notes Due 2013 [Member]	Sep. 29, 2012 Convertible Senior Notes Due 2013 [Member]	Oct. 01, 2011 Convertible Senior Notes Due 2011 and 2013 [Member]	Oct. 01, 2011 Convertible Senior Notes Due 2011 and 2013 [Member]
Effective interest rate and components of interest expense
Effective interest rate	6.40%	6.40%	6.30%	6.30%
Contractual interest expense	$ 540	$ 1,619	$ 1,053	$ 3,161
Amortization of debt discount	$ 1,588	$ 4,674	$ 3,275	$ 9,684

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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