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v3.23.2

SHARE-BASED COMPENSATION AND BENEFIT PLANS (Tables) | 6 Months Ended
--- | ---
Jun. 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 |  | 72 | ​ |  | 838.69
Exercised |  | (143) | ​ |  | 271.57
Forfeited or expired |  | (10) | ​ |  | 583.04
Outstanding at June 30, 2023 |  | 988 | ​ | $ | 402.25
Exercisable at June 30, 2023 |  | 716 | ​ | $ | 313.93
Black-Scholes option pricing model | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30,
​ |  | 2023 | ​ | 2022
Risk free interest rate |  | 3.87 | % | ​ | 1.81 | %
Expected life |  | 6.4 | Years | ​ | 6.4 | Years
Expected volatility |  | 29.1 | % | ​ | 28.7 | %
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,
​ |  | 2023 |  | 2022 |  | 2023 | ​ | 2022
Compensation expense for stock options awarded | ​ | $ | 5,796 | ​ | $ | 4,909 | ​ | $ | 11,915 | ​ | $ | 10,210
Income tax benefit from compensation expense related to stock options | ​ |  | 1,447 | ​ |  | 1,214 | ​ |  | 2,975 | ​ |  | 2,525
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,
​ |  | 2023 |  | 2022 |  | 2023 |  | 2022
Compensation expense for shares issued under the ESPP | ​ | $ | 879 | ​ | $ | 808 | ​ | $ | 1,740 | ​ | $ | 1,601
Income tax benefit from compensation expense related to shares issued under the ESPP | ​ | ​ | 219 | ​ | ​ | 200 | ​ | ​ | 435 | ​ | ​ | 396
Compensation expense for restricted shares awarded | ​ | ​ | 461 | ​ | ​ | 452 | ​ | ​ | 916 | ​ | ​ | 891
Income tax benefit from compensation expense related to restricted awards | ​ | $ | 115 | ​ | $ | 112 | ​ | $ | 229 | ​ | $ | 220

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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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