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Share-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2020
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,
2020201920202019
(In thousands)
Stock option expense$3,331 $3,214 $10,330 $9,594 
Restricted stock expense4,537 3,995 12,665 11,112 
PRSU expense2,957 6,349 6,883 8,298 
Total pre-tax expense$10,825 $13,558 $29,878 $29,004 
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, 2020
Year Ended December 31,
2019
Expected volatility22.2 %19.1 %
Expected term (years)5.05.0
Risk-free interest rate0.52 %2.25 %
Expected dividend yield1.14 %0.66 %
Black-Scholes-Merton fair value per stock option granted$11.01 $16.85 
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, 20194,303 $62.50 
Granted963 63.37 
Exercised(697)53.71 
Forfeited(114)71.27 
Outstanding at September 30, 20204,455 $63.84 5.8$158.4 
Exercisable at September 30, 20202,540 $59.31 4.0$101.8 
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, 2019561 $72.46 
Granted242 63.79 
Vested(191)72.21 
Forfeited(36)75.28 
Non-vested restricted stock outstanding at September 30, 2020576 $68.72