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SHARE-BASED COMPENSATION PLANS (Tables) | 12 Months Ended
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Dec. 31, 2023
SHARE-BASED COMPENSATION PLANS |
Schedule of assumptions used for estimating the fair value of share options using the Black-Scholes option-pricing model | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Assumptions: |  | 2023 |  | 2022 |  | 2021 |
Risk-free interest rate |  | ​ | 4.1 | % | ​ | 1.5 | % | ​ | 0.6 | %
Expected dividend yield |  | ​ | 4.1 | % | ​ | 3.7 | % | ​ | 3.8 | %
Volatility (1) |  | ​ | 26.00 | % | ​ | 25.00 | % | ​ | 25.00 | %
Weighted average expected life of the options (2) |  | ​ | 6.0 | years | ​ | 6.0 | years | ​ | 6.0 | years
Weighted average grant date fair value of options granted per share | ​ | $ | 7.90 | ​ | $ | 8.83 | ​ | $ | 4.62 | ​
Term | ​ | ​ | 10.0 | years | ​ | 10.0 | years | ​ | 10.0 | years
​
| (1) | Expected volatility is based upon the Company’s historical daily share prices.
​
| (2) | The expected life is based on the contractual term of the options as well as the weighted average vesting period.
Summary of option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Options | ​ | Weighted Average Strike Price | ​ | Weighted Average Remaining Contractual Term (Years) |
Balance at December 31, 2022 |  | 2,537,038 | ​ | $ | 33.10 | ​ | 6.21 | ​
Options granted |  | 408,650 | ​ | ​ | 40.25 | ​ | 9.00 | ​
Options canceled |  | (38,296) | ​ | ​ | 44.17 | ​ | 8.44 | ​
Options exercised |  | (144,233) | ​ | ​ | 18.83 | ​ | 1.66 | ​
Balance at December 31, 2023 |  | 2,763,159 | ​ | $ | 34.75 | ​ | 5.95 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Vested or expected to vest at December 31, 2023 |  | 2,763,159 | ​ | $ | 34.75 |  | 5.95 | ​
Exercisable at December 31, 2023 |  | 1,972,708 | ​ | $ | 31.40 |  | 5.02 | ​
Schedule of non-vested restricted share activity | ​
​ | ​ | ​ | ​
​ |  | Number of Non- |
​ | ​ | Vested Restricted |
​ | ​ | Shares and Performance Units |
Non-Vested at January 1, 2023 |  | 340,952 | ​
Granted |  | 190,540 | ​
Vested |  | (155,468) | ​
Forfeited |  | (15,495) | ​
Non-Vested at December 31, 2023 |  | 360,529 | ​
Schedule of estimation of the fair value of the awards, the key assumptions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Assumptions: |  | 2023 |  | 2022 |  | 2021 |
Risk-free interest rate |  | ​ | 4.2 | % | ​ | 1.0 | % | ​ | 0.2 | %
Volatility (1) |  | ​ | 32.00 | % | ​ | 28.00 | % | ​ | 28.00 | %

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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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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 -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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