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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-Based Compensation |
Schedule of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year Ended December 31, |
​ | ​ | ​ | 2019 | ​ | 2018 | ​ | 2017 |
​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted |
​ | ​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average |
​ | ​ | ​ | ​ | ​ | Exercise | ​ | ​ | ​ | Exercise | ​ | ​ | ​ | Exercise |
​ |  | ​ | Shares | ​ | Price | ​ | Shares | ​ | Price | ​ | Shares | ​ | Price |
Outstanding at January 1, 2019 | ​ |  | 213,866 |  | $ | 61.28 |  | 218,689 |  | $ | 52.75 |  | 246,535 |  | $ | 42.53 | ​
Granted | ​ |  | — | ​ |  | — | ​ | 34,407 | ​ |  | 91.05 | ​ | 33,634 | ​ |  | 91.23 | ​
Exercised | ​ |  | (36,978) | ​ |  | 33.26 | ​ | (33,424) | ​ |  | 30.88 | ​ | (59,480) | ​ |  | 33.03 | ​
Forfeited | ​ |  | — | ​ |  | — | ​ | (5,806) | ​ |  | 91.35 | ​ | (2,000) | ​ |  | 26.01 | ​
Outstanding at December 31, 2019 | ​ |  | 176,888 | ​ |  | 67.14 | ​ | 213,866 | ​ |  | 61.28 | ​ | 218,689 | ​ |  | 52.75 | ​
Exercisable at December 31, 2019 | ​ |  | 131,216 | ​ |  | 60.12 | ​ | 140,115 | ​ |  | 49.41 | ​ | 148,702 | ​ |  | 41.62 | ​
Weighted-average fair value of options granted during the year | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | $ | 28.01 | ​ | ​ | ​ | $ | 35.42 | ​
Schedule of information pertaining to options outstanding | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Options Outstanding | ​ | Options Exercisable | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Average | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Remaining | ​ | Weighted | ​ | ​ | ​ | Weighted | ​ | Remaining | ​
Range of | ​ | Number | ​ | Contractual | ​ | Average | ​ | Number | ​ | Average | ​ | Contractual | ​
Exercise Prices | ​ | Outstanding | ​ | Life | ​ | Exercise Price | ​ | Outstanding | ​ | Exercise Price | ​ | Life | ​
$ | 26.01 | - | $ | 40.00 |  | 20,170 |  | 1.7 | years | ​ | $ | 31.56 |  | 20,164 | ​ | $ | 31.56 |  |  | ​
$ | 40.01 | - | $ | 55.00 |  | 19,874 |  | 2.9 | years | ​ | $ | 41.42 |  | 19,874 | ​ | $ | 41.42 | ​ | ​ | ​
$ | 55.01 | - | $ | 70.00 |  | 74,609 |  | 5.1 | years | ​ | $ | 63.61 |  | 68,186 | ​ | $ | 63.59 | ​ | ​ | ​
$ | 70.01 | - | $ | 85.00 | ​ | — | ​ | — | years | ​ | $ | — | ​ | — | ​ | $ | — | ​ | ​ | ​
$ | 85.01 | - | $ | 91.35 |  | 62,235 |  | 7.6 | years | ​ | $ | 91.12 | ​ | 22,992 | ​ | $ | 91.07 | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ |  | 176,888 |  | 5.4 | years | ​ | $ | 67.14 |  | 131,216 | ​ | $ | 60.12 |  | 4.6 | years
Schedule of weighted-average assumptions used in valuing options | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31,
​ |  | 2019 |  | 2018 |  | 2017
Dividend yield | ​ | — | % | ​ | 1.46 | % |  | 1.40 | %
Expected life |  | — | years | ​ | 8.5 | years |  | 8.5 | years
Expected volatility |  | — | % |  | 28.0 | % |  | 37.2 | %
Risk-free interest rate |  | — | % |  | 2.54 | % |  | 2.43 | %
Summary of nonvested restricted stock | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted- |
​ | ​ | ​ | ​ | Average |
​ | ​ | ​ | ​ | Grant-Date |
Restricted Stock | ​ | Shares | ​ | Fair Value |
Nonvested at January 1, 2019 |  | 104,419 | ​ | $ | 62.45 | ​
Granted |  | 8,934 | ​ |  | 73.34 | ​
Vested |  | (40,858) | ​ |  | 70.06 | ​
Forfeited |  | (3,045) | ​ |  | 72.01 | ​
Nonvested at December 31, 2019 |  | 69,450 | ​ |  | 58.96 | ​
Vesting schedule of shares | ​
​ | ​ | ​ | ​
​ |  | Shares |
2020 |  | 48,830 | ​
2021 |  | 3,905 | ​
2022 |  | 4,174 | ​
2023 |  | 4,553 | ​
2024 |  | 3,405 | ​
Thereafter |  | 4,583 | ​
​ |  | 69,450 | ​
Summary of nonvested RSUs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted- |
​ | ​ | ​ | ​ | Average |
​ | ​ | ​ | ​ | Grant-Date |
Restricted Stock Units | ​ | Shares | ​ | Fair Value |
Nonvested at January 1, 2019 |  | 200,540 | ​ | $ | 85.10 | ​
Granted |  | 159,521 | ​ |  | 68.27 | ​
Vested | ​ | (31,723) | ​ | ​ | 89.40 | ​
Forfeited | ​ | (3,737) | ​ | ​ | 82.18 | ​
Nonvested at December 31, 2019 |  | 324,601 | ​ |  | 76.44 | ​

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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