Stockholders' Equity (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 30, 2014
Stock option activity
Outstanding at period start (in shares)	5,724
Options, Exercised (in shares)	(875)
Options, Cancelled (in shares)	(4)
Outstanding at period end (in shares)	4,845
Weighted-Average Exercise Price, Outstanding at beginning of period (in dollars per share)	$ 32.64
Weighted Average Exercise Price, Exercised (in dollars per share)	$ 25.94
Weighted Average Exercise Price, Cancelled (in dollars per share)	$ 4.35
Weighted-Average Exercise Price, Outstanding at end of period (in dollars per share)	$ 33.87