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SHARE-BASED COMPENSATION AND BENEFIT PLANS (Tables) | 6 Months Ended
--- | ---
Jun. 30, 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 |  | 61 | ​ |  | 1,062.42
Exercised |  | (199) | ​ |  | 316.22
Forfeited or expired |  | (5) | ​ |  | 780.03
Outstanding at June 30, 2024 |  | 741 | ​ | $ | 508.49
Exercisable at June 30, 2024 |  | 526 | ​ | $ | 380.44
Black-Scholes option pricing model | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30,
​ |  | 2024 | ​ | 2023
Risk free interest rate |  | 4.18 | % | ​ | 3.87 | %
Expected life |  | 6.5 | Years | ​ | 6.4 | Years
Expected volatility |  | 28.2 | % | ​ | 29.1 | %
Expected dividend yield |  | — | % | ​ | — | %
Summary of activity of share-based compensation and benefit plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Three Months Ended | ​ | For the Six Months Ended
​ | ​ | June 30, | ​ | June 30,
​ |  | 2024 |  | 2023 |  | 2024 | ​ | 2023
Compensation expense for stock options awarded | ​ | $ | 5,742 | ​ | $ | 5,796 | ​ | $ | 11,337 | ​ | $ | 11,915
Income tax benefit from compensation expense related to stock options | ​ |  | 1,475 | ​ |  | 1,447 | ​ |  | 2,913 | ​ |  | 2,975
Employee stock purchase plan [Member] | 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 Six Months Ended
​ | ​ | June 30, | ​ | June 30,
​ |  | 2024 |  | 2023 |  | 2024 |  | 2023
Compensation expense for shares issued under the ESPP | ​ | $ | 983 | ​ | $ | 879 | ​ | $ | 1,936 | ​ | $ | 1,740
Income tax benefit from compensation expense related to shares issued under the ESPP | ​ | ​ | 253 | ​ | ​ | 219 | ​ | ​ | 497 | ​ | ​ | 435
Compensation expense for restricted shares awarded | ​ | ​ | 482 | ​ | ​ | 461 | ​ | ​ | 956 | ​ | ​ | 916
Income tax benefit from compensation expense related to restricted awards | ​ | $ | 124 | ​ | $ | 115 | ​ | $ | 246 | ​ | $ | 229

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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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -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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