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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock-Based Compensation Expense
The consolidated statements of operations for the three months ended March 30, 2019 and March 31, 2018 include the following stock-based compensation expense related to stock option awards, restricted stock awards, restricted stock unit awards, performance stock unit awards and the employee stock purchase plan (in thousands):
 
 
 
Three Months Ended
 
 
 
March 30, 2019
 
 
March 31, 2018
 
Cost of sales
 
$
575
 
 
$
605
 
Selling and administrative expenses
 
 
8,125
 
 
 
8,483
 
Research and development expenses
 
 
1,241
 
 
 
804
 
Total stock-based compensation
 
$
9,941
 
 
$
9,892
 
Relevant Data Used to Determine the Value of Stock Options Granted During the Period
The relevant data used to determine the value of the stock options granted during the three months ended March 30, 2019 and March 31, 2018 are as follows:
 
 
Three Months Ended
 
Options Issued and Significant Assumptions Used to Estimate 
Option Fair Values
 
 
March 30, 2019
 
 
 
March 31, 2018
 
Options issued in thousands
 
 
136
 
 
 
133
 
Risk-free interest rate
 
 
2.5
%
 
 
2.7
%
Expected life in years
 
 
5
 
 
 
6
 
Expected volatility
 
 
24.2
%
 
 
23.2
%
Expected dividends
 
 
 
 
 
 
 
 
  
Three Months Ended
 
Weighted-Average Exercise Price and Fair Value of Options on 
the Date of Grant
  
March 30, 2019
 
  
March 31, 2018
 
Exercise price
  
$
232.08
 
  
$
206.66
 
Fair value
  
$
61.97
 
  
$
58.38
 
Stock Options Outstanding Roll Forward
The following table summarizes stock option activity for the plans for the three months ended March 30, 2019 (in thousands, except per share data):
 
 
 
Number of Shares
 
 
Exercise Price per Share
 
 
Weighted-Average

Exercise Price per

Share
 
Outstanding at December 31, 2018
 
 
1,790
 
 
$
 
 
 
 
38.09
 
 
 
to
 
 
$
 
 
 
 
208.47
 
 
$
142.47
 
Granted
 
 
136
 
 
$
 
 
 
 
183.41
 
 
 
to
 
 
$
 
 
 
 
238.52
 
 
$
232.08
 
Exercised
 
 
(239
)
 
$
 
 
 
 
38.09
 
 
 
to
 
 
$
 
 
 
 
208.47
 
 
$
108.57
 
Outstanding at March 30, 2019
 
 
1,687
 
 
$
 
 
 
 
61.63
 
 
 
to
 
 
$
 
 
 
 
238.52
 
 
$
154.42
 
Restricted Stock Units Unvested Roll Forward
The following table summarizes the unvested restricted stock unit award activity for the three months ended March 30, 2019 (in thousands, except per share data):
 
 
 
Shares
 
 
Weighted-Average

Fair Value per

Share
 
Unvested at December 31, 2018
 
 
304
 
 
$
153.31
 
Granted
 
 
78
 
 
$
238.52
 
Vested
 
 
(102
)
 
$
138.48
 
Forfeited
 
 
(6
)
 
$
158.22
 
Unvested at March 30, 2019
 
 
274
 
 
$
182.98
 
Relevant Data Used to Determine the Value of Performance Shares The relevant data used to determine the value of the performance stock units granted during the three months ended March 30, 2019 and March 31, 2018 are as follows:
 
 
 
Three Months Ended
 
Performance Stock Units Issued and Significant Assumptions Used 
to Estimate Fair Values
 
 
March 30, 2019
 
 
 
March 31, 2018
 
Performance stock units issued (in thousands)
 
 
12
 
 
 
15
 
Risk-free interest rate
 
 
2.4
%
 
 
2.0
%
Expected life in years
 
 
2.8
 
 
 
2.9
 
Expected volatility
 
 
23.5
%
 
 
18.0
%
Average volatility of peer companies
 
 
26.2
%
 
 
25.8
%
Correlation coefficient
 
 
34.2
%
 
 
37.4
%
Expected dividends
 
 
 
 
 
 
Performance Stock Units Unvested Roll Forward
The following table summarizes the unvested performance stock unit award activity for the three months ended March 30, 2019 (in thousands, except per share data):
 
 
 
Shares
 
 
Weighted-Average

Fair Value per

Share
 
Unvested at December 31, 2018
 
 
100
 
 
$
212.34
 
Granted
 
 
12
 
 
$
391.21
 
Unvested at March 30, 2019
 
 
112
 
 
$
231.50