Debt (Details) (USD $) In Thousands, unless otherwise specified	Dec. 29, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Principal	$ 494,639	$ 494,639
Unamortized Discount	(47,628)	(68,658)
Carrying Value	447,011	425,981
Notes Due Twenty-Thirteen [Member]
Debt Instrument [Line Items]
Principal	144,461	144,461
Unamortized Discount	(6,447)	(12,719)
Carrying Value	138,014	131,742
Convertible Senior Notes Due Twenty-Fifteen [Member]
Debt Instrument [Line Items]
Principal	350,000	350,000
Unamortized Discount	(41,181)	(55,939)
Carrying Value	308,819	294,061
Zero Coupon Zero Yield Senior Convertible Notes Due Two Zero Two Three [Member]
Debt Instrument [Line Items]
Principal	178	178
Unamortized Discount	0	0
Carrying Value	178	178
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Principal	0	0
Unamortized Discount	0	0
Carrying Value	$ 0	$ 0