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Stock Plans (Tables) | 6 Months Ended
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Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Stock Compensation Expense | Stock compensation expense is as follows:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
(In thousands) |  | 2018 |  | 2017 |  | 2018 |  | 2017
Stock compensation expense |  | $ | 2,085 |  |  | $ | 1,908 |  |  | $ | 7,692 |  |  | $ | 8,233 |
Income tax benefit |  | 507 |  |  | 721 |  |  | 1,869 |  |  | 3,107 |
Stock compensation expense, net of income tax benefit |  | $ | 1,578 |  |  | $ | 1,187 |  |  | $ | 5,823 |  |  | $ | 5,126 |
Summary of Stock Option Activity | A summary of stock option activity for the six months ended June 30, 2018, follows:
|  | Shares |  | Weighted Average Exercise Price
Outstanding at January 1, 2018 |  | 955,446 |  |  | $ | 42.75 |
Exercised |  | (118,957 | ) |  | 36.09 |
Forfeited |  | (3,358 | ) |  | 44.50 |
Outstanding at June 30, 2018 |  | 833,131 |  |  | 43.72 |
Exercisable at June 30, 2018 |  | 719,299 |  |  | $ | 43.59 |
Summary of Restricted Stock and Unit Activity | A summary of restricted stock and unit activity for the six months ended June 30, 2018, follows:
|  | Shares |  | Weighted Average Grant Date Fair Value
Unvested at January 1, 2018 |  | 227,161 |  |  | $ | 57.50 |
Granted |  | 65,133 |  |  | 85.57 |
Vested |  | (81,031 | ) |  | 58.32 |
Forfeited |  | (3,555 | ) |  | 57.76 |
Unvested at June 30, 2018 |  | 207,708 |  |  | $ | 66.89 |
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 2018 with a market condition modifier.
Fair value per unit | $83.58
Risk-free interest rate | 2.36%
Expected dividend yield | 1.82%
Expected volatility | 28.3%
MSA stock beta | 1.240
Summary of Performance Stock Unit Activity | A summary of performance stock unit activity for the six months ended June 30, 2018, follows:
|  | Shares |  | Weighted Average Grant Date Fair Value
Unvested at January 1, 2018 |  | 242,186 |  |  | $ | 55.06 |
Granted |  | 62,775 |  |  | 84.79 |
Performance adjustments |  | (3,356 | ) |  | 44.61 |
Vested |  | (41,660 | ) |  | 40.23 |
Forfeited |  | (8,659 | ) |  | 44.53 |
Unvested at June 30, 2018 |  | 251,286 |  |  | $ | 65.45 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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