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Debt (Details 2) (Convertible Senior Notes Due 2013 [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Convertible Senior Notes Due 2013 [Member]
Effective interest rate and components of interest expense of 2013 notes
Effective interest rate	6.40%	6.40%
Contractual interest expense	$ 540	$ 540
Amortization of debt discount	$ 1,651	$ 1,539

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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