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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Stock-Based Compensation |
Summary of activity under the entity's stock option plans | The following table summarizes activity under our stock option plans (shares in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended | ​
​ | ​ | December 31, | ​
​ | ​ | 2019 | ​
​ |  | ​ |  | Weighted- | ​
​ | ​ | ​ | ​ | Average | ​
Stock Options |  | Shares |  | Exercise Price |
Outstanding at beginning of year |  | 499 | ​ | $ | 25.65 | ​
Granted |  | — | ​ | $ | — | ​
Exercised |  | (114) | ​ | $ | 20.57 | ​
Forfeited |  | — | ​ | $ | — | ​
Expired |  | (3) | ​ | $ | 42.50 | ​
Outstanding at end of year |  | 382 | ​ | $ | 27.06 | ​
Options exercisable at end of year |  | 301 | ​ | ​ | ​ | ​
Summary information about stock options outstanding | The following table summarizes information about stock options outstanding at December 31, 2019 (shares in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Options Outstanding | ​ | Options Exercisable |
​ |  | ​ |  | Weighted- |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
​ | ​ | Number | ​ | Remaining | ​ | Weighted- | ​ | Number | ​ | Weighted- |
​ | ​ | Outstanding at | ​ | Contractual | ​ | Average | ​ | Exercisable at | ​ | Average |
Range of Exercise Prices |  | 12/31/2019 |  | Life |  | Exercise Price |  | 12/31/2019 |  | Exercise Price |
$11.21 - $15.00 |  | 45 |  | 2.9 | ​ | $ | 13.60 |  | 45 | ​ | $ | 13.60 | ​
$15.01 - $35.00 |  | 200 |  | 5.1 | ​ | $ | 21.47 |  | 200 | ​ | $ | 21.47 | ​
$35.01 - $42.50 |  | 137 |  | 7.7 | ​ | $ | 39.67 |  | 56 | ​ | $ | 38.51 | ​
$11.21 - $42.50 |  | 382 |  | 5.8 | ​ | $ | 27.06 |  | 301 | ​ | $ | 23.45 | ​
Schedule of fair values and the assumptions used for the grants | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
​ |  | 2018 |  | 2017 |
Weighted-average fair value per share of options granted | ​ | $ | 13.06 | ​ | $ | 11.43 | ​
Fair value assumptions: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Expected dividend yield | ​ | ​ | 0.79% | ​ | ​ | 0.89% | ​
Expected stock price volatility | ​ | ​ | 31.7% | ​ | ​ | 34.5% | ​
Risk-free interest rate | ​ | ​ | 2.66% | ​ | ​ | 2.11% | ​
Expected term | ​ |  | 5.3 years | ​ |  | 5.3 years | ​
Summary of information about nonvested stock option awards and changes | The following table summarizes information about nonvested stock option awards as of December 31, 2019 and changes for the year ended December 31, 2019 (shares in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted-Average | ​
​ | ​ | ​ | ​ | Grant Date | ​
Stock Options |  | Shares |  | Fair Value |
Nonvested at December 31, 2018 |  | 163 | ​ | $ | 11.99 | ​
Granted |  | — | ​ | $ | — | ​
Vested |  | (82) | ​ | $ | 11.46 | ​
Forfeited |  | — | ​ | $ | — | ​
Nonvested at December 31, 2019 |  | 81 | ​ | $ | 12.53 | ​
Summary of activity under the entity's restricted stock plans | The following table summarizes activity under our restricted stock plans (shares in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended | ​
​ | ​ | December 31, | ​
​ | ​ | 2019 | ​
​ | ​ | ​ | ​ | Weighted | ​
​ | ​ | ​ | ​ | Average Grant | ​
Restricted Stock and Restricted Stock Units |  | Shares |  | Date Fair Value |
Unvested at beginning of year |  | 78 | ​ | $ | 38.17 | ​
Granted |  | 87 | ​ | $ | 51.02 | ​
Vested |  | (69) | ​ | $ | 41.58 | ​
Forfeited |  | (5) | ​ | $ | 44.01 | ​
Unvested at end of year |  | 91 | ​ | $ | 47.58 | ​

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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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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