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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Summary of RSUs | A summary of the RSUs for the year ended December 31, 2017 is as follows:
|  | Restricted Share Awards |
|  | Performance |  |  |  |  |  |  | Total |  |  | Weighted-Average |
|  | and Service |  |  | Service |  |  | Restricted |  |  | Grant-Date |
|  | Required |  |  | Required |  |  | Awards |  |  | Fair Value |
Nonvested as of January 1, 2017 |  |  | 130,168 |  |  |  | 15,974 |  |  |  | 146,142 |  |  | $ | 38.46 |
Granted |  |  | 80,247 |  |  |  | 10,560 |  |  |  | 90,807 |  |  |  | 54.60 |
Vested |  |  | 0 |  |  |  | (5,859 | ) |  |  | (5,859 | ) |  |  | 45.85 |
Forfeited |  |  | (9,843 | ) |  |  | (2,461 | ) |  |  | (12,304 | ) |  |  | 46.86 |
Nonvested as of December 31, 2017 |  |  | 200,572 |  |  |  | 18,214 |  |  |  | 218,786 |  |  | $ | 52.68 |
Weighted-Average Assumptions for Estimating Fair Values | The fair values for the stock options granted were estimated at the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions:
| 2017 |  |  | 2016 |  | 2015 |
Risk-free interest rate |  | 2.0 | % |  | N/A |  |  | 2.1 | %
Dividend yield |  | 1.7 | % |  | N/A |  |  | 1.6 | %
Expected life (years) | 5 |  |  | N/A |  | 5 |
Expected volatility |  | 36.8 | % |  | N/A |  |  | 37.9 | %
Long Term Incentive Plan [Member] |
Stock Option Activity in Company's Plan | Activity in the Company’s LTIP for the year ended December 31, 2017 was as follows:
|  | Number of Shares |  |  | Weighted Average Exercise Price per Share |  |  | Weighted Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value |
Outstanding at January 1, 2017 |  |  | 52,750 |  |  | $ | 54.54 |  |  |  |  |  |  |  |  |
Granted |  |  | 5,000 |  |  | $ | 48.00 |  |  |  |  |  |  |  |  |
Exercised |  |  | (28,500 | ) |  | $ | 46.90 |  |  |  |  |  |  |  |  |
Forfeited |  |  | 0 |  |  | $ | 0.00 |  |  |  |  |  |  |  |  |
Outstanding (vested and expected to vest) at December 31, 2017 |  |  | 29,250 |  |  | $ | 56.84 |  |  |  | 7.1 |  |  | $ | 423 |
Exercisable at December 31, 2017 |  |  | 21,625 |  |  | $ | 60.69 |  |  |  | 6.5 |  |  | $ | 231 |
Stock Options [Member] |
Stock Option Activity in Company's Plan | Activity in the Company’s 1999 Stock Option Plan for the year ended December 31, 2017 was as follows:
|  | Number of Shares |  |  | Weighted Average Exercise Price per Share |  |  | Weighted Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value |
Outstanding at January 1, 2017 |  |  | 5,550 |  |  | $ | 48.35 |  |  |  |  |  |  |  |  |
Exercised |  |  | (4,800 | ) |  | $ | 49.79 |  |  |  |  |  |  |  |  |
Forfeited |  |  | 0 |  |  | $ | 0.00 |  |  |  |  |  |  |  |  |
Outstanding (exercisable and vested) at December 31, 2017 |  |  | 750 |  |  | $ | 39.10 |  |  |  | 1.8 |  |  | $ | 24 |

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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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- 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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