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Stock Plans (Tables)
 6 Months Ended
Jun. 30, 2022
Share-based Payment Arrangement [Abstract]  
Schedule of Stock Compensation Expense
Stock compensation expense is as follows:
 Three Months Ended June 30,Six Months Ended June 30,
(In thousands)2022202120222021
Stock compensation expense$4,629 $7,403 $8,358 $10,695 
Income tax benefit1,134 1,784 2,048 2,577 
Stock compensation expense, net of tax$3,495 $5,619 $6,310 $8,118 
Summary of Stock Option Activity
A summary of stock option activity for the six months ended June 30, 2022, follows:
SharesWeighted Average
Exercise Price
Outstanding at January 1, 2022161,701 $45.47 
Exercised(6,439)46.29 
Outstanding at June 30, 2022155,262 45.44 
Exercisable at June 30, 2022155,217 $45.44 
Summary of Restricted Stock and Unit Activity A summary of restricted stock activity for the six months ended June 30, 2022, follows:
SharesWeighted Average
Grant Date Fair Value
Unvested at January 1, 2022118,343 $132.62 
Granted63,321 133.71 
Vested(43,382)114.09 
Forfeited(3,308)134.80 
Unvested at June 30, 2022134,974 $139.03 
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 during the six months ended June 30, 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 six months ended June 30, 2022, 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(2,582)147.20 
Unvested at June 30, 2022194,663 $146.40