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SHARE-BASED COMPENSATION AND BENEFIT PLANS (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2023
Employee Stock Option [Member] |
Share-Based Compensation and Benefit Plans |
Summary of stock options | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Shares | ​ | Weighted- Average
​ | ​ | (in thousands) | ​ | Exercise Price
Outstanding at December 31, 2022 |  | 1,069 | ​ | $ | 356.76
Granted |  | 87 | ​ |  | 856.08
Exercised |  | (207) | ​ |  | 272.39
Forfeited or expired |  | (12) | ​ |  | 573.96
Outstanding at September 30, 2023 |  | 937 | ​ | $ | 419.41
Exercisable at September 30, 2023 |  | 669 | ​ | $ | 323.28
Black-Scholes option pricing model | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30,
​ |  | 2023 | ​ | 2022
Risk free interest rate |  | 3.92 | % | ​ | 2.00 | %
Expected life |  | 6.3 | Years | ​ | 6.3 | Years
Expected volatility |  | 29.0 | % | ​ | 28.8 | %
Expected dividend yield |  | — | % | ​ | — | %
Summary of activity of share-based compensation and benefit plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Three Months Ended | ​ | For the Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
​ |  | 2023 |  | 2022 |  | 2023 | ​ | 2022
Compensation expense for stock options awarded | ​ | $ | 5,977 | ​ | $ | 4,924 | ​ | $ | 17,892 | ​ | $ | 15,134
Income tax benefit from compensation expense related to stock options | ​ |  | 1,476 | ​ |  | 1,222 | ​ |  | 4,417 | ​ |  | 3,756
Restricted stock [Member] |
Share-Based Compensation and Benefit Plans |
Summary of activity of share-based compensation and benefit plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Three Months Ended | ​ | For the Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
​ |  | 2023 |  | 2022 |  | 2023 |  | 2022
Compensation expense for shares issued under the ESPP | ​ | $ | 923 | ​ | $ | 828 | ​ | $ | 2,663 | ​ | $ | 2,429
Income tax benefit from compensation expense related to shares issued under the ESPP | ​ | ​ | 228 | ​ | ​ | 205 | ​ | ​ | 657 | ​ | ​ | 603
Compensation expense for restricted shares awarded | ​ | ​ | 477 | ​ | ​ | 459 | ​ | ​ | 1,393 | ​ | ​ | 1,350
Income tax benefit from compensation expense related to restricted awards | ​ | $ | 118 | ​ | $ | 114 | ​ | $ | 344 | ​ | $ | 335

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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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