Debt (Details) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Dec. 29, 2012
Debt Instrument [Line Items]
Principal	$ 544,561	$ 494,639
Unamortized debt discount	(30,724)	(47,628)
Carrying value	50,000	0
Carrying value	513,837	447,011
Notes Due Twenty-Thirteen [Member]
Debt Instrument [Line Items]
Principal	144,461	144,461
Unamortized debt discount	(1,449)	(6,447)
Carrying value	143,012	138,014
Convertible Senior Notes Due 2015 [Member]
Debt Instrument [Line Items]
Principal	350,000	350,000
Unamortized debt discount	(29,275)	(41,181)
Carrying value	320,725	308,819
Zero Coupon Zero Yield Senior Convertible Notes Due Two Zero Two Three [Member]
Debt Instrument [Line Items]
Principal	100	178
Unamortized debt discount	0	0
Carrying value	100	178
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Principal	50,000	0
Unamortized debt discount	0	0
Carrying value	$ 50,000	$ 0