v3.8.0.1

Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Total Stock-Based Compensation Expense by Type of Award | Total stock-based compensation expense by type of award was as follows for the years ended December 31:
In Thousands | 2017 |  | 2016 |  | 2015
Stock options | $ | 738 |  |  | $ | 791 |  |  | $ | 658 |
Stock appreciation rights (“SARs”) | 1,543 |  |  | 805 |  |  | 144 |
Stock grants | 217 |  |  | — |  |  | — |
Total stock-based compensation expense | $ | 2,498 |  |  | $ | 1,596 |  |  | $ | 802 |
Tax benefit on exercise of stock options | $ | — |  |  | $ | 60 |  |  | $ | 40 |
Summary of Stock Option Activity | The following presents a summary of stock option activity for the year ended December 31, 2017:
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value (In Thousands)
Outstanding at January 1, 2017 | 351,400 |  |  | $ | 31.28 |  |  |  |  |
Granted | 80,000 |  |  | 41.95 |  |  |  |  |
Exercised | (91,500 | ) |  | 21.06 |  |  |  |  |
Outstanding at December 31, 2017 | 339,900 |  |  | $ | 36.55 |  |  | 6.8 years |  | $ | 4,258 |
Vested and exercisable at December 31, 2017 | 146,899 |  |  | $ | 33.36 |  |  | 5.0 years |  | $ | 2,334 |
Stock Options Valuation Assumptions | The fair value of stock options granted during the years ended December 31, 2017, 2016 and 2015, was estimated on the date of grant using a Black-Scholes option pricing model and the following weighted average assumptions:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Risk-free interest rate | 1.84 | % |  | 1.46 | % |  | 1.22 | %
Expected dividend yield | 0.19 | % |  | 0.23 | % |  | 0.25 | %
Expected volatility | 30.80 | % |  | 32.92 | % |  | 31.90 | %
Expected lives | 5.0 years |  |  | 5.0 years |  |  | 5.0 years |
Summary of Stock Appreciation Rights Activity | The following presents a summary of SARs activity for the year ended December 31, 2017:
| Cash-settled SARs |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value (In Thousands)
Outstanding at January 1, 2017 | 226,500 |  |  | $ | 37.97 |  |  |  |  |
Granted | 174,500 |  |  | 41.95 |  |  |  |  |
Exercised | (21,300 | ) |  | 38.49 |  |  |  |  |
Forfeited/Canceled | (12,800 | ) |  | 41.36 |  |  |  |  |
Outstanding at December 31, 2017 | 366,900 |  |  | $ | 39.73 |  |  | 8.2 years |  | $ | 3,274 |
Vested and exercisable at December 31, 2017 | 67,200 |  |  | $ | 39.87 |  |  | 7.0 years |  | $ | 590 |
Stock Appreciation Rights Valuation Assumptions | The fair value of SARs granted during the years ended December 31, 2017, 2016 and 2015, was estimated on the date of grant using a Black-Scholes option pricing model and the following weighted average assumptions:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Risk-free interest rate | 2.01 | % |  | 1.53 | % |  | 1.39 | %
Expected dividend yield | 0.16 | % |  | 0.18 | % |  | 0.22 | %
Expected volatility | 31.90 | % |  | 33.25 | % |  | 30.30 | %
Expected lives | 3.2 years |  |  | 3.4 years |  |  | 3.2 years |

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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 number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards that were granted, exercised or converted, forfeited, and expired 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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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