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STOCK PLANS (Tables) | 12 Months Ended
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Dec. 31, 2025
STOCK PLANS |
Summary of stock option activity | The following table summarizes stock option activity for the year ended December 31, 2025 under all Plans: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | Number of | ​ | Exercise
​ | ​ ​ ​ | Options | ​ ​ ​ | Price
Balance at beginning of year |  | 696,546 | ​ | $ | 135.17
Options granted |  | 54,495 | ​ |  | 215.90
Options exercised |  | (126,092) | ​ |  | 91.83
Options canceled | ​ | (449) | ​ | ​ | 69.67
Options forfeited | ​ | (2,817) | ​ | ​ | 233.40
Balance at end of year |  | 621,683 | ​ |  | 150.63
Exercisable at end of year |  | 521,057 | ​ |  | 137.09
Weighted average assumptions used for estimating fair value of options granted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | 2025 | ​ ​ ​ | 2024 | ​ ​ ​ | 2023 |
Expected volatility |  | ​ | 26.18 | % | ​ | 26.90 | % | ​ | 27.63 | %
Dividend yield |  | ​ | 1.60 | % | ​ | 1.40 | % | ​ | 1.59 | %
Risk-free interest rate |  | ​ | 4.37 | % | ​ | 4.26 | % | ​ | 4.04 | %
Expected option life (years) |  | ​ | 4.8 |  | ​ | 4.8 |  | ​ | 4.8 | ​
Weighted average fair value per option granted during the year | ​ | $ | 55.85 | ​ | $ | 66.20 | ​ | $ | 46.94 | ​
Summary of nonvested stock options | The following table summarizes non-vested stock options for the year ended December 31, 2025: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted Average
​ | ​ | Number of | ​ | Fair Value at
​ | ​ ​ ​ | Options | ​ ​ ​ | Grant Date
Balance at beginning of year |  | 110,567 | ​ | $ | 53.42
Granted |  | 54,495 | ​ |  | 55.85
Vested |  | (61,170) | ​ |  | 47.47
Canceled | ​ | (449) | ​ | ​ | 16.49
Forfeited | ​ | (2,817) | ​ | ​ | 61.67
Balance at end of year |  | 100,626 | ​ |  | 58.05
Summary of information about awards outstanding, by exercise price range | The following table summarizes information about awards outstanding as of December 31, 2025: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Outstanding | ​ | Exercisable
​ | ​ | ​ | ​ | Weighted | ​ | Weighted | ​ | ​ | ​ | Weighted | ​ | Weighted
​ | ​ | Number of | ​ | Average | ​ | Average | ​ | Number of | ​ | Average | ​ | Average
​ | ​ | Stock | ​ | Exercise | ​ | Remaining | ​ | Stock | ​ | Exercise | ​ | Remaining
Exercise Price Range | ​ ​ ​ | Options | ​ ​ ​ | Price | ​ ​ ​ | Life (years) | ​ ​ ​ | Options | ​ ​ ​ | Price | ​ ​ ​ | Life (years)
Under $99.99 |  | 86,768 | ​ | $ | 86.43 |  | 2.95 |  | 86,768 | ​ | $ | 86.43 |  | 2.95
$100.00 - $199.99 |  | 387,136 | ​ |  | 133.64 |  | 5.95 |  | 374,189 | ​ |  | 132.17 |  | 5.91
Over $200.00 |  | 147,779 | ​ |  | 232.85 |  | 8.47 |  | 60,100 | ​ |  | 240.86 |  | 8.13
​ |  | 621,683 | ​ | ​ | ​ |  | 6.13 |  | 521,057 | ​ | ​ | ​ |  | 5.67
Summary of RSU and PSU activity | The following table summarizes RSU and PSU activity for the year ended December 31, 2025 under all Plans: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | Number of | ​ | Grant Date
​ | ​ ​ ​ | Units | ​ ​ ​ | Fair Value
Balance at beginning of year |  | 293,418 | ​ | $ | 176.70
Units granted |  | 118,411 | ​ |  | 205.23
Units vested |  | (162,121) | ​ |  | 145.66
Units forfeited |  | (7,934) | ​ |  | 201.11
Balance at end of year |  | 241,774 | ​ |  | 210.59

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