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Stock-Based Compensation (Tables)
3 Months Ended
Apr. 02, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
The components and classification of stock-based compensation expense were as follows (in thousands):
 Three Months Ended
 April 2,
2021
April 3,
2020
Stock options$— $13 
RSUs4,704 1,725 
Total stock-based compensation expense$4,704 $1,738 
Cost of sales$1,114 $454 
Selling, general and administrative3,355 1,136 
Research, development and engineering235 148 
Total stock-based compensation expense$4,704 $1,738 
Schedule of Share-based Compensation, Stock Options Activity
The following table summarizes the Company’s stock option activity for the three month period ended April 2, 2021:
Number of
Stock
Options
Weighted
Average
Exercise
Price
Weighted
Average
Remaining
Contractual
Life
(In Years)
Aggregate
Intrinsic
Value
(In Millions)
Outstanding at December 31, 2020281,873 $36.05 
Exercised(4,229)27.32 
Outstanding and exercisable at April 2, 2021277,644 $36.18 4.5$15.4 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The weighted average fair value and assumptions used to value the TSR portion of the PRSUs granted are as follows:
 Three Months Ended
 April 2,
2021
April 3,
2020
Weighted average fair value$85.16 $107.42 
Risk-free interest rate0.19 %1.53 %
Expected volatility41 %30 %
Expected life (in years)3.02.9
Expected dividend yield— %— %
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
The following table summarizes time-vested RSU activity for the three month period ended April 2, 2021:
Time-Vested
Activity
Weighted
Average
Grant Date Fair Value
Nonvested at December 31, 2020207,923 $75.38 
Granted146,247 79.09 
Vested(59,143)63.94 
Forfeited(2,327)80.24 
Nonvested at April 2, 2021292,700 $79.51 
The following table summarizes PRSU activity for the three month period ended April 2, 2021:
Performance-
Vested
Activity
Weighted
Average
Grant Date Fair Value
Nonvested at December 31, 2020219,391 $72.33 
Granted92,345 85.16 
Vested(38,882)37.75 
Forfeited(65,941)49.00 
Nonvested at April 2, 2021206,913 $91.98