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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2023
Restricted Stock  
Summary of information about nonvested stock option awards and changes

The following table summarizes activity under our restricted stock plans (shares in thousands):

Year Ended

December 31, 2023

Weighted-

Average Grant

Restricted Stock and Restricted Stock Units

    

Shares

    

Date Fair Value

 

Unvested at beginning of year

 

104

$

76.39

Granted

 

72

$

164.47

Vested

 

(63)

$

79.32

Forfeited

 

$

Unvested at end of year

 

113

$

130.83

Performance Stock Units  
Schedule of fair values of the total shareholder return portion

December 31, 2023

2023 PSU Grant

2022 PSU Grant

Risk-free interest rate

4.2

%

4.7

%

Dividend yield

0.5

%

0.5

%

Volatility

35.0

%

35.1

%

Look-back period (in years)

2.0

1.0

December 31, 2022

2022 PSU Grant

2021 PSU Grant

Risk-free interest rate

4.4

%

4.7

%

Dividend yield

0.5

%

0.5

%

Volatility

33.5

%

35.1

%

Look-back period (in years)

2.0

1.0

December 31, 2021

2021 PSU Grant

2020 PSU Grant

Risk-free interest rate

0.7

%

0.4

%

Dividend yield

0.5

%

0.5

%

Volatility

50.1

%

31.8

%

Look-back period (in years)

2.0

1.0