Stockholders' Equity (Details 1) (Restricted Stock [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Apr. 01, 2012
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Units, Outstanding at January 1, 2012 (in shares)	3,476	[1]
Restricted Stock Units, Awarded (in shares)	541	[1]
Restricted Stock Units, Vested (in shares)	(237)	[1]
Restricted Stock Units, Cancelled (in shares)	(159)	[1]
Restricted Stock Units, Outstanding at April 1, 2012 (in shares)	3,621	[1]
Weighted Average Grant Date Fair Value per Share, Outstanding at January 1, 2012 (in dollars per share)	$ 41.87
Weighted Average Grant Date Fair Value per Share, Awarded (in dollars per share)	$ 50.19
Weighted Average Grant Date Fair Value per Share, Vested (in dollars per share)	$ 38.93
Weighted Average Grant Date Fair Value per Share, Cancelled (in dollars per share)	$ 45.95
Weighted Average Grant Date Fair Value per Share, Outstanding at April 1, 2012 (in dollars per share)	$ 37.64

[1] The fair value of each restricted stock unit represents the fair market value of one share of the Company’s common stock.