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Stock Plans (Tables)
 9 Months Ended
Sep. 30, 2022
Share-based Payment Arrangement [Abstract]  
Schedule of Stock Compensation Expense
Stock compensation expense is as follows:
 Three Months Ended September 30,Nine Months Ended September 30,
(In thousands)2022202120222021
Stock compensation expense$2,967 $2,867 $11,325 $13,562 
Income tax benefit727 691 2,775 3,269 
Stock compensation expense, net of tax$2,240 $2,176 $8,550 $10,293 
Summary of Stock Option Activity
A summary of stock option activity for the nine months ended September 30, 2022, is as follows:
SharesWeighted Average
Exercise Price
Outstanding at January 1, 2022161,701 $45.47 
Exercised(92,833)44.84 
Outstanding at September 30, 202268,868 46.32 
Exercisable at September 30, 202268,861 $46.32 
Summary of Restricted Stock and Unit Activity A summary of restricted stock activity for the nine months ended September 30, 2022, is as follows:
SharesWeighted Average
Grant Date Fair Value
Unvested at January 1, 2022118,343 $132.62 
Granted78,023 130.77 
Vested(49,661)113.52 
Forfeited(8,041)138.63 
Unvested at September 30, 2022138,664 $138.07 
Schedule of Fair Value Assumptions for Units The following weighted average assumptions were used in estimating the fair value of the performance stock units granted in the first quarter of 2022.
Fair value per unit$143.60
Risk-free interest rate1.72%
Expected dividend yield1.14%
Expected volatility34.4%
MSA stock beta0.890
Summary of Performance Stock Unit Activity
A summary of performance stock unit activity for the nine months ended September 30, 2022, is as follows:
SharesWeighted Average
Grant Date Fair Value
Unvested at January 1, 2022193,335 $129.86 
Granted81,504 142.38 
Performance adjustments(22,147)99.84 
Vested(55,447)101.38 
Forfeited(18,180)147.81 
Unvested at September 30, 2022179,065 $146.27