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Stock-Based Compensation Expense (Tables)
 3 Months Ended
Apr. 03, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock Option Activity
The following table summarizes the Company’s stock option activity for the three-month period ended April 3, 2016:
 
Shares
(in thousands)
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Term (in years)
 
Aggregate
Intrinsic
Value
(in thousands)
Outstanding as of December 31, 2015
6,644

 
$
28.27

 
 
 
 
Granted
1,662

 
33.45

 
 
 
 
Exercised
(196
)
 
17.53

 
 
 
 
Forfeited or expired
(43
)
 
37.56

 
 
 
 
Outstanding as of April 3, 2016
8,067

 
$
29.55

 
7.51
 
$
81,838

Exercisable as of April 3, 2016
3,645

 
$
21.69

 
5.83
 
$
64,616

Options vested or expected to vest as of April 3, 2016 (1)
7,248

 
$
28.75

 
7.33
 
$
79,128

 (1) In addition to the vested options, the Company expects a portion of the unvested options to vest at some point in the future. Options expected to vest are calculated by applying an estimated forfeiture rate to the unvested options.
Weighted-Average Assumptions Used in Estimating Fair Values of Stock Options Granted
The fair values of stock options granted in each period presented were estimated using the following weighted-average assumptions:
 
Three-months Ended
 
April 3, 2016
 
April 5, 2015
Risk-free rate
1.7
%
 
2.1
%
Expected dividend yield
0.84
%
 
1.25
%
Expected volatility
41
%
 
40
%
Expected term (in years)
5.5

 
5.4
Nonvested Restricted Stock Shares Activity
The following table summarizes the Company's restricted stock activity for the three-month period ended April 3, 2016:
 
Shares (in thousands)
 
Weighted-Average Grant Fair Value
 
Aggregate Intrinsic Value (in thousands)(1)
Nonvested as of December 31, 2015
20

 
$
34.05

 
 
Granted
—

 
—

 
 
Vested
—

 
—

 
 
Forfeited or expired
—

 
—

 
 
Nonvested as of April 3, 2016
20

 
$
34.05

 
$
783
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
The following table presents the stock-based compensation expense by caption for each period presented on the Consolidated Statements of Operations (in thousands):
 
Three-months Ended
 
April 3, 2016
 
April 5, 2015
Cost of revenue
$
293

 
$
467

Research, development, and engineering
2,179

 
1,814

Selling, general, and administrative
4,332

 
4,382

Discontinued operations
—

 
283

 
$
6,804

 
$
6,946