Stock-Based Compensation Expense (Tables)

9 Months Ended

Oct. 02, 2011

Stock-Based Compensation Expense [Abstract]

Stock option activity

						Weighted-
				Weighted-		Average		Aggregate
				Average		Remaining		Intrinsic
	Shares			Exercise		Contractual		Value
	(in thousands)			Price		Term (in years)		(in thousands)
Outstanding as of December 31, 2010		4,318		$	20.05
Granted		986			30.43
Exercised		(1,351	)		20.70
Forfeited or expired		(67	)		21.96
Outstanding as of October 2, 2011		3,886		$	22.46		7.2	$	21,850
Exercisable as of October 2, 2011		1,305		$	20.39		4.9	$	8,989

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

	Three-months Ended						Nine-months Ended
	October 2,			October 3,			October 2,			October 3,
	2011			2010			2011			2010
Risk-free rate		3.6	%		3.2	%		3.6	%		3.4	%
Expected dividend yield		1.0	%		1.4	%		1.0	%		1.3	%
Expected volatility		42	%		44	%		42	%		44	%
Expected term (in years)		5.2			5.3			5.4			5.3

Stock-based compensation expense

	Three-months Ended				Nine-months Ended
	October 2,		October 3,		October 2,		October 3,
	2011		2010		2011		2010
Product cost of revenue	$	80	$	63	$	350	$	135
Service cost of revenue		27		32		136		44
Research, development, and engineering		394		346		1,732		680
Selling, general, and administrative		1,019		837		3,611		813
	$	1,520	$	1,278	$	5,829	$	1,672