Stock-Based Compensation Expense (Tables)

6 Months Ended

Jul. 03, 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		927		30.40
Exercised		(1,004)		20.87
Forfeited or expired		(52)		22.00
Outstanding as of July 3, 2011		4,189		$     22.15		7.2		$       58,091
Exercisable as of July 3, 2011		1,638		$     20.36		5.1		$       25,707

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

	Three-months Ended				Six-months Ended
	July 3,		July 4,		July 3,		July 4,
	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		5.2		5.4		5.3

Stock-based compensation expense

	Three-months Ended				Six-months Ended
	July 3,		July 4,		July 3,		July 4,
	2011		2010		2011		2010
Product cost of revenue		$        105		$            14		$       270		$         72
Service cost of revenue		39		11		109		12
Research, development, and engineering		529		83		1,338		334
Selling, general, and administrative		1,284		319		2,592		(24)
	$	1,957		$          427		$       4,309		$       394