Stock-Based Compensation (Tables)

3 Months Ended

Apr. 01, 2012

Stock-Based Compensation [Abstract]

Summary of stock option activity

	Shares (in thousands)			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in thousands)
Outstanding as of December 31, 2011		4,473		$	24.48
Granted		5			44.75
Exercised		(614	)		21.46
Forfeited or expired		(37	)		22.25
Outstanding as of April 1, 2012		3,827		$	25.06		7.7	$	66,253
Exercisable as of April 1, 2012		1,190		$	21.11		5.7	$	25,337

Weighted-average assumptions used in estimating the fair values of stock options granted

	Quarter Ended
	April 1,   2012			April 3,   2011
Risk-free rate		2.0	%		3.6	%
Expected dividend yield		1.2	%		1.0	%
Expected volatility		44	%		42	%
Expected term (in years)		5.7			5.4

Stock-based compensation expense

	Quarter Ended
	April 1, 2012		April 3, 2011
Product cost of revenue	$	240	$	165
Service cost of revenue		68		70
Research, development, and engineering		867		809
Selling, general, and administrative		2,139		1,308
	$	3,314	$	2,352