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Share-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]  
Total Share-Based Compensation Expense
Total share-based compensation expense was as follows:
Three Months Ended
September 30,
Nine Months Ended
September 30,
2023202220232022
(In thousands)
Stock option expense$3,560 $3,043 $10,740 $9,866 
Restricted stock expense5,578 4,800 15,875 14,831 
Performance restricted stock unit expense3,775 4,217 9,158 9,890 
Total pre-tax expense$12,913 $12,060 $35,773 $34,587 
Weighted Average Assumptions Used for Estimating Fair Values of Stock Options Granted The following weighted average assumptions were used in the Black-Scholes-Merton model to estimate the fair values of stock options granted during the periods indicated:
Nine Months Ended
September 30, 2023
Year Ended December 31, 2022
Expected volatility26.0 %24.5 %
Expected term (years)5.05.0
Risk-free interest rate3.54 %2.33 %
Expected dividend yield0.72 %0.65 %
Black-Scholes-Merton fair value per stock option granted$38.11 $32.54 
Summary of Stock Option Activity and Related Information
The following is a summary of the Company’s stock option activity and related information:
SharesWeighted
Average
Exercise
Price
Weighted
Average
Remaining
Contractual
Life 
Aggregate
Intrinsic
Value
(In thousands)(Years)(In millions)
Outstanding at December 31, 20223,060 $79.46 
Granted453 138.46 
Exercised(551)71.78 
Forfeited(65)124.38 
Outstanding at September 30, 20232,897 $99.97 6.7$138.4 
Exercisable at September 30, 20231,976 $83.88 5.7$126.3 
Summary of Nonvested Restricted Stock Activity and Related Information
The following is a summary of the Company’s non-vested restricted stock activity and related information:
SharesWeighted
Average
 Grant Date
Fair Value
(In thousands)
Non-vested restricted stock outstanding at December 31, 2022356 $117.18 
Granted154 138.63 
Vested(156)104.30 
Forfeited(26)127.00 
Non-vested restricted stock outstanding at September 30, 2023328 $132.61 
The following is a summary of the Company’s non-vested performance restricted stock activity and related information:
SharesWeighted
Average
 Grant Date
Fair Value
(In thousands)
Non-vested performance restricted stock outstanding at December 31, 2022275 $101.98 
Granted79 138.46 
Performance assumption change 1
48 63.37 
Vested(161)63.37 
Forfeited(2)131.76 
Non-vested performance restricted stock outstanding at September 30, 2023239 $131.90 
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1 Reflects the number of PRSUs above target levels based on performance metrics.