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SHARE-BASED COMPENSATION AND BENEFIT PLANS (Tables) | 3 Months Ended
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Mar. 31, 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 |  | 62 | ​ |  | 829.83
Exercised |  | (35) | ​ |  | 291.35
Forfeited or expired |  | (5) | ​ |  | 557.30
Outstanding at March 31, 2023 |  | 1,091 | ​ | $ | 385.00
Exercisable at March 31, 2023 |  | 803 | ​ | $ | 302.61
​
Black-Scholes option pricing model | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31,
​ |  | 2023 | ​ | 2022
Risk free interest rate |  | 3.91 | % | ​ | 1.61 | %
Expected life |  | 6.5 | Years | ​ | 6.5 | Years
Expected volatility |  | 29.1 | % | ​ | 28.5 | %
Expected dividend yield |  | — | % | ​ | — | %
​
Summary of activity of share-based compensation and benefit plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Three Months Ended
​ | ​ | March 31,
​ |  | 2023 |  | 2022
Compensation expense for stock options awarded | ​ | $ | 6,119 | ​ | $ | 5,301
Income tax benefit from compensation expense related to stock options | ​ |  | 1,534 | ​ |  | 1,346
Weighted-average grant-date fair value of options awarded | ​ | $ | 318.08 | ​ | $ | 217.68
​
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,
​ |  | 2023 |  | 2022
Compensation expense for shares issued under the ESPP | ​ | $ | 861 | ​ | $ | 793
Income tax benefit from compensation expense related to shares issued under the ESPP | ​ | ​ | 216 | ​ | ​ | 201
Compensation expense for restricted shares awarded | ​ | ​ | 455 | ​ | ​ | 439
Income tax benefit from compensation expense related to restricted awards | ​ | $ | 114 | ​ | $ | 112
​

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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