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Stock Plans (Tables)
 6 Months Ended
Jun. 30, 2025
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock Compensation Expense
Stock compensation expense, included in Selling, general and administrative expense in the unaudited Condensed Consolidated Statements of Income, is as follows:
 Three Months Ended June 30,Six Months Ended June 30,
(In thousands)2025202420252024
Stock compensation expense$5,370 $5,042 $7,999 $9,229 
Income tax benefit1,327 1,235 1,976 2,261 
Stock compensation expense, net of tax$4,043 $3,807 $6,023 $6,968 
We have not capitalized any stock-based compensation expense.
Summary of Stock Option Activity
A summary of stock option activity for the six months ended June 30, 2025, is as follows:
SharesWeighted Average
Exercise Price
Outstanding at January 1, 202515,018 $45.10 
Exercised(11,173)44.50 
Outstanding and exercisable at June 30, 20253,845 $46.84 
Summary of Restricted Stock and Unit Activity A summary of restricted stock activity for the six months ended June 30, 2025, is as follows:
SharesWeighted Average
Grant Date
Fair Value
Unvested at January 1, 2025179,584 $150.39 
Granted70,166 160.04 
Vested(49,730)145.11 
Forfeited(11,379)154.82 
Unvested at June 30, 2025188,641 $155.11 
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 2025:
Fair value per unit$160.54
Risk-free interest rate4.28%
Expected dividend yield1.14%
Expected volatility25.3%
MSA stock beta0.744
Summary of Performance Stock Unit Activity
A summary of performance stock unit activity for the six months ended June 30, 2025, is as follows:
SharesWeighted Average
Grant Date
Fair Value
Unvested at January 1, 2025161,996 $146.50 
Granted56,344 160.53 
Performance adjustments(a)
64,457 143.49 
Vested(118,605)143.47 
Forfeited(19,655)156.61 
Unvested at June 30, 2025144,537 $151.73 
(a)Performance adjustments relate primarily to the final number of shares issued for the 2022 performance unit awards which vested in the first quarter of 2025 at 220% of the target award based on both cumulative performance against EBITDA margin and revenue growth targets and MSA's total shareholder return during the three-year performance period.