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Stock Plans (Tables)
 9 Months Ended
Sep. 29, 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 nine months ended September 29, 2013 and September 30, 2012:
 
 
Three Months Ended
 
Nine Months Ended
 
September 29,
2013
 
September 30,
2012
 
September 29,
2013
 
September 30,
2012
 
(In thousands)
Cost of product and service revenue
$
337

 
$
327

 
$
958

 
$
906

Research and development expenses
203

 
186

 
629

 
547

Selling, general and administrative expenses
3,241

 
4,588

 
9,836

 
13,899

Total stock-based compensation expense
$
3,781

 
$
5,101

 
$
11,423

 
$
15,352
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 Nine Months Ended
 
September 29,
2013
 
September 30,
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 nine months ended September 29, 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
(721
)
 
21.20

 
 
 
 
Canceled
(7
)
 
22.63

 
 
 
 
Forfeited
(325
)
 
22.82

 
 
 
 
Outstanding at September 29, 2013
3,731

 
$
23.29

 
3.6
 
$
46.9

Exercisable at September 29, 2013
2,590

 
$
20.82

 
2.7
 
$
38.9

Vested and expected to vest in the future
3,683

 
$
22.93

 
3.6
 
$
46.5
Summary of Restricted Stock Award Activity
The following table summarizes restricted stock award activity for the nine months ended September 29, 2013:
 
 
Number of
Shares
 
Weighted-
Average
Grant-
Date Fair
Value
 
(In thousands)
 
 
Nonvested at December 30, 2012
781

 
$
24.71

Granted
277

 
33.74

Vested
(327
)
 
23.23

Forfeited
(70
)
 
28.67

Nonvested at September 29, 2013
661

 
$
28.80