Stock Plans (Tables)

6 Months Ended

Jun. 30, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Total Compensation Recognized Related to Outstanding Equity Awards

The following table summarizes total pre-tax compensation expense recognized related to the Company’s stock options, restricted stock, restricted stock units, performance units and stock grants, net of estimated forfeitures, included in the Company’s condensed consolidated statements of operations for the three and six months ended June 30, 2013 and July 1, 2012:

	Three Months Ended				Six Months Ended
	June 30, 2013		July 1, 2012		June 30, 2013		July 1, 2012
	(In thousands)
Cost of product and service revenue	$	307	$	304	$	620	$	580
Research and development expenses	211		185		426		361
Selling, general and administrative expenses	2,708		4,287		6,596		9,311
Total stock-based compensation expense	$	3,226	$	4,776	$	7,642	$	10,252

Weighted-Average Assumptions Used in the Black-Scholes Option Pricing Model

The Company’s weighted-average assumptions used in the Black-Scholes option pricing model were as follows:

	Three and Six Months Ended
	June 30, 2013		July 1, 2012
Risk-free interest rate	0.9	%	0.6	%
Expected dividend yield	0.8	%	1.2	%
Expected lives	5 years		4 years
Expected stock volatility	38.5	%	38.7	%

Summary of Stock Option Activity

The following table summarizes stock option activity for the six months ended June 30, 2013:

	Number of Shares		Weighted- Average Price		Weighted-Average Remaining Contractual Term	Total Intrinsic Value
	(In thousands)				(In years)	(In millions)
Outstanding at December 30, 2012	4,266		$	21.64
Granted	518		33.62
Exercised	(336	)	21.68
Canceled	(7	)	22.63
Forfeited	(299	)	22.39
Outstanding at June 30, 2013	4,142		$	23.08	3.7	$	40.4
Exercisable at June 30, 2013	2,960		$	20.81	2.8	$	35.3
Vested and expected to vest in the future	4,091		$	23.02	3.7	$	40.2

Summary of Restricted Stock Award Activity

The following table summarizes restricted stock award activity for the six months ended June 30, 2013:

	Number of Shares		Weighted- Average Grant- Date Fair Value
	(In thousands)
Nonvested at December 30, 2012	781		$	24.71
Granted	272		33.70
Vested	(310	)	23.20
Forfeited	(50	)	28.92
Nonvested at June 30, 2013	693		$	28.61