Convertible Notes (Details) (Convertible Senior Notes Due 2015 [Member], USD $) In Thousands	Oct. 01, 2011	Jan. 01, 2011	Jun. 30, 2010
Convertible Senior Notes Due 2015 [Member]
Principal amount, Unamortized debt discount and Net carrying amount of the liability component
Principal amount of Convertible Senior Notes	$ 350,000	$ 350,000	$ 350,000
Unamortized debt discount of Convertible Senior Notes	(59,438)	(69,604)
Net liability of Convertible Senior Notes	$ 290,562	$ 280,396

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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