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SHARE-BASED COMPENSATION AND BENEFIT PLANS (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2024
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, 2023 |  | 884 | ​ | $ | 428.50
Granted |  | 54 | ​ |  | 1,069.20
Exercised |  | (165) | ​ |  | 316.84
Forfeited or expired |  | (2) | ​ |  | 641.53
Outstanding at March 31, 2024 |  | 771 | ​ | $ | 496.55
Exercisable at March 31, 2024 |  | 545 | ​ | $ | 369.68
Black-Scholes option pricing model | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31,
​ |  | 2024 | ​ | 2023
Risk free interest rate |  | 4.14 | % | ​ | 3.91 | %
Expected life |  | 6.6 | Years | ​ | 6.5 | Years
Expected volatility |  | 28.3 | % | ​ | 29.1 | %
Expected dividend yield |  | — | % | ​ | — | %
Summary of activity of share-based compensation and benefit plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Three Months Ended
​ | ​ | March 31,
​ |  | 2024 |  | 2023
Compensation expense for stock options awarded | ​ | $ | 5,595 | ​ | $ | 6,119
Income tax benefit from compensation expense related to stock options | ​ |  | 1,438 | ​ |  | 1,534
Restricted stock [Member] |
Share-Based Compensation and Benefit Plans |
Summary of activity of share-based compensation and benefit plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Three Months Ended
​ | ​ | March 31,
​ |  | 2024 |  | 2023
Compensation expense for shares issued under the ESPP | ​ | $ | 953 | ​ | $ | 861
Income tax benefit from compensation expense related to shares issued under the ESPP | ​ | ​ | 245 | ​ | ​ | 216
Compensation expense for restricted shares awarded | ​ | ​ | 474 | ​ | ​ | 455
Income tax benefit from compensation expense related to restricted awards | ​ | $ | 122 | ​ | $ | 114

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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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