Stockholders' Equity (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Apr. 01, 2012
Stock option activity
Options, Outstanding at January 1, 2012 (in shares)	10,378
Options, Granted (in shares)	136
Options, Exercised (in shares)	(997)
Options, Cancelled (in shares)	(114)
Options, Outstanding at April 1, 2012 (in shares)	9,403
Weighted-Average Exercise Price, Outstanding at January 1, 2012 (in dollars per share)	$ 29.69
Weighted Average Exercise Price, Granted (in dollars per share)	$ 36.30
Weighted Average Exercise Price, Exercised (in dollars per share)	$ 18.07
Weighted Average Exercise Price, Cancelled (in dollars per share)	$ 40.57
Weighted-Average Exercise Price, Outstanding at April 1, 2012 (in dollars per share)	$ 30.88