Stockholders' Equity (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 29, 2013
Stock option activity
Outstanding as of December 30, 2012	8,351
Options, Granted (in shares)	512
Options, Exercised (in shares)	(2,409)
Options, Cancelled (in shares)	(129)
Outstanding as of September 29, 2013	6,325
Weighted-Average Exercise Price, Outstanding at December 30, 2012 (in dollars per share)	$ 32.10
Weighted Average Exercise Price, Granted (in dollars per share)	$ 14.74
Weighted Average Exercise Price, Exercised (in dollars per share)	$ 28.56
Weighted Average Exercise Price, Cancelled (in dollars per share)	$ 42.81
Weighted-Average Exercise Price, Outstanding at September 29, 2013 (in dollars per share)	$ 31.83