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Stock Plans (Tables)
 9 Months Ended
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock Compensation Expense
Stock compensation expense is as follows:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(In thousands)
 
2016
 
2015
 
2016
 
2015
Stock compensation expense
 
$
1,341

 
$
144

 
$
8,292

 
$
6,931

Income tax benefit
 
515

 
51

 
3,210

 
2,647

Stock compensation expense, net of income tax benefit
 
$
826

 
$
93

 
$
5,082

 
$
4,284
Schedule of Weighted Average Risk Assumptions
Stock option expense is based on the fair value of stock option grants estimated on the grant dates using the Black-Scholes option pricing model and the following weighted average assumptions for options granted in 2016.
Fair value per option
$11.69
Risk-free interest rate
1.64
%
Expected dividend yield
2.81
%
Expected volatility
33.71
%
Expected life (years)
7.01
Summary of Stock Option Activity
A summary of stock option activity for the nine months ended September 30, 2016 follows:
 
 
Shares
 
Weighted Average
Exercise Price
Outstanding at January 1, 2016
 
1,694,675

 
$
36.69

Granted
 
235,233

 
44.50

Exercised
 
(156,979
)
 
38.89

Forfeited
 
(6,173
)
 
46.95

Outstanding at September 30, 2016
 
1,766,756

 
37.49

Exercisable at September 30, 2016
 
1,282,699

 
$
33.75
Summary of Restricted Stock and Unit Activity
A summary of restricted stock and unit activity for the nine months ended September 30, 2016 follows:
 
 
Shares
 
Weighted Average
Grant Date Fair Value
Unvested at January 1, 2016
 
217,709

 
$
49.70

Granted
 
81,843

 
45.35

Vested
 
(74,030
)
 
49.15

Forfeited
 
(8,991
)
 
48.71

Unvested at September 30, 2016
 
216,531

 
$
48.17
Schedule of Fair Value Assumptions for Units
The following weighted average assumptions were used in the Monte Carlo model for units granted in 2016 with a market condition modifier.
Fair value per unit
$43.77
Risk-free interest rate
0.96
%
Expected dividend yield
2.81
%
Expected volatility
29.00
%
MSA stock beta
1.202
Summary of Performance Stock Unit Activity
A summary of performance stock unit activity for the nine months ended September 30, 2016 follows:
 
 
Shares
 
Weighted Average
Grant Date Fair Value
Unvested at January 1, 2016
 
171,644

 
$
50.24

Granted
 
64,800

 
44.08

Performance adjustments
 
(15,594
)
 
58.54

Vested
 
(31,181
)
 
58.54

Forfeited
 
(1,903
)
 
46.67

Unvested at September 30, 2016
 
187,766

 
$
46.08