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Stock Plans (Tables)
3 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock Compensation Expense
Stock compensation expense is as follows:
 
 
Three Months Ended March 31,
(In thousands)
 
2019
 
2018
Stock compensation expense
 
$
2,745

 
$
5,606

Income tax benefit
 
670

 
1,362

Stock compensation expense, net of income tax benefit
 
$
2,075

 
$
4,244

Summary of Stock Option Activity
A summary of stock option activity for the three months ended March 31, 2019, follows:
 
 
Shares
 
Weighted Average
Exercise Price
Outstanding at January 1, 2019
 
735,001

 
$
43.79

Exercised
 
(44,407
)
 
36.24

Outstanding at March 31, 2019
 
690,594

 
44.28

Exercisable at March 31, 2019
 
690,594

 
$
44.28

Summary of Restricted Stock and Unit Activity
A summary of restricted stock and unit activity for the three months ended March 31, 2019, follows:
 
 
Shares
 
Weighted Average
Grant Date Fair Value
Unvested at January 1, 2019
 
205,449

 
$
68.97

Granted
 
37,320

 
103.59

Vested
 
(44,421
)
 
44.23

Forfeited
 
(1,062
)
 
83.33

Unvested at March 31, 2019
 
197,286

 
$
81.38

Schedule of Fair Value Assumptions for Units
The following weighted average assumptions were used in the Monte Carlo model for units granted in the first quarter of 2019 with a market condition modifier.
Fair value per unit
$99.82
Risk-free interest rate
2.47%
Expected dividend yield
1.57%
Expected volatility
26.6%
MSA stock beta
1.094
Summary of Performance Stock Unit Activity
A summary of performance stock unit activity for the three months ended March 31, 2019, follows:
 
 
Shares
 
Weighted Average
Grant Date Fair Value
Unvested at January 1, 2019
 
218,886

 
$
68.43

Granted
 
76,813

 
100.66

Performance adjustments
 
77,783

 
43.77

Vested
 
(139,476
)
 
44.75

Unvested at March 31, 2019
 
234,006

 
$
84.93