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Convertible Notes (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 Notes Due 2013 [Member] Rate	Apr. 02, 2011 Notes Due 2011 and 2013 [Member] Rate
Effective interest rate and components of interest expense
Effective interest rate	6.40%	6.30%
Contractual interest expense	$ 540	$ 1,054
Amortization of debt discount	$ 1,539	$ 3,197

The component of interest expense representing the noncash expenses charged against earnings in the period to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate caption: Noncash Interest Expense.

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