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STOCK-BASED COMPENSATION PLANS (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
STOCK-BASED COMPENSATION PLANS |
Schedule of Activity in this long-term incentive program | Activity in this long-term incentive program is as follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Stock Options
​ | ​ | ​ | ​ | Weighted-
​ | ​ | ​ | ​ | average Exercise
​ |  | Outstanding |  | Price of Shares
Outstanding at December 31, 2019 |  | 1,502,994 | ​ | $ | 42.82
Granted |  | 254,496 | ​ |  | 51.68
Exercised |  | (197,564) | ​ |  | 32.65
Forfeited |  | (17,667) | ​ |  | 50.97
Outstanding at December 31, 2020 |  | 1,542,259 | ​ |  | 45.49
Granted |  | 168,976 | ​ |  | 79.68
Exercised |  | (310,423) | ​ |  | 40.17
Forfeited |  | (8,107) | ​ |  | 61.56
Outstanding at December 31, 2021 |  | 1,392,705 | ​ |  | 50.73
Exercisable at December 31, 2021 |  | 879,074 | ​ | $ | 43.84
​
Schedule of information about stock options outstanding under the Company???s stock option plan | The following table summarizes the information about stock options outstanding under the Company’s stock option plan at December 31, 2021: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Options outstanding | ​ | Options exercisable
​ | ​ | ​ | ​ | Weighted- | ​ | Weighted- | ​ | ​ | ​ | Weighted-
​ | ​ | ​ | ​ | average | ​ | average | ​ | ​ | ​ | average
​ | ​ | ​ | ​ | Exercise | ​ | Remaining | ​ | ​ | ​ | Exercise
Range of Exercise Price |  | Shares |  | Price |  | Life (years) |  | Shares |  | Price
$0.00 – $29.00 |  | 57,354 | ​ | $ | 24.78 |  | 3.55 |  | 57,354 | ​ | $ | 24.78
$29.01 – $30.00 |  | 58,276 | ​ |  | 29.79 |  | 1.21 |  | 58,276 | ​ |  | 29.79
$30.01 – $40.00 |  | 403,901 | ​ |  | 37.07 |  | 3.46 |  | 403,901 | ​ |  | 37.07
$40.01 – $60.00 |  | 706,389 | ​ |  | 55.54 |  | 6.91 |  | 352,515 | ​ |  | 56.30
$60.01 – $80.00 |  | 166,785 | ​ |  | 79.68 |  | 9.22 |  | 7,028 | ​ |  | 79.66
TOTAL |  | 1,392,705 | ​ | $ | 50.73 |  | 5.81 |  | 879,074 | ​ | $ | 43.84
​
Schedule of valuation assumptions used to estimate value of stock options | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020 |  | 2019 |
Weighted-average Fair Value of Options Granted | ​ | $ | 18.43 | ​ | $ | 10.86 | ​ | $ | 14.16 | ​
Assumptions: | ​ |  | ​ | ​ |  |  | ​ |  |  | ​
Weighted-average expected life (in years) | ​ |  | 6.50 | ​ |  | 6.50 | ​ |  | 6.50 | ​
Future dividend yield | ​ |  | 2.48 | % |  | 2.57 | % |  | 2.73 | %
Share price volatility | ​ |  | 30.09 | % |  | 29.29 | % |  | 29.31 | %
Weighted-average risk-free interest rate | ​ |  | 1.28 | % |  | 0.67 | % |  | 2.44 | %
​
Schedule of activity unvested restricted stock awards | A summary of the status of the Company’s unvested restricted stock awards as of December 31, 2021, and changes during the twelve months ended December 31, 2021 and 2020, is presented below: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Restricted | ​ | Weighted-average
​ |  | Shares |  | grant date fair value
Unvested at December 31, 2019 |  | 196,788 | ​ | $ | 45.58
Awards |  | 52,132 | ​ |  | 51.64
Forfeitures |  | (12,884) | ​ |  | 37.14
Vestings |  | (59,628) | ​ |  | 47.80
Unvested at December 31, 2020 |  | 176,408 | ​ |  | 47.24
Awards |  | 51,456 | ​ |  | 79.51
Forfeitures |  | (2,619) | ​ |  | 54.15
Vestings |  | (47,977) | ​ |  | 52.84
Unvested at December 31, 2021 |  | 177,268 | ​ | $ | 54.98
​

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