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SHARE-BASED COMPENSATION AND BENEFIT PLANS (Tables) | 3 Months Ended
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Mar. 31, 2022
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, 2021 |  | 1,206 | ​ | $ | 300.09
Granted |  | 90 | ​ |  | 676.96
Exercised |  | (50) | ​ |  | 311.38
Forfeited or expired |  | (1) | ​ |  | 413.27
Outstanding at March 31, 2022 |  | 1,245 | ​ | $ | 326.81
Exercisable at March 31, 2022 |  | 891 | ​ | $ | 262.06
Black-Scholes option pricing model | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31,
​ |  | 2022 | ​ | 2021
Risk free interest rate |  | 1.61 | % | ​ | 0.85 | %
Expected life |  | 6.5 | Years | ​ | 6.4 | Years
Expected volatility |  | 28.5 | % | ​ | 29.9 | %
Expected dividend yield |  | — | % | ​ | — | %
Summary of activity of share-based compensation and benefit plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Three Months Ended
​ | ​ | March 31,
​ |  | 2022 |  | 2021
Compensation expense for stock options awarded | ​ | $ | 5,301 | ​ | $ | 5,262
Income tax benefit from compensation expense related to stock options | ​ |  | 1,346 | ​ |  | 1,296
Weighted-average grant-date fair value of options awarded | ​ | $ | 217.68 | ​ | $ | 144.30
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,
​ |  | 2022 |  | 2021
Compensation expense for shares issued under the ESPP | ​ | $ | 793 | ​ | $ | 650
Income tax benefit from compensation expense related to shares issued under the ESPP | ​ | ​ | 201 | ​ | ​ | 160
Compensation expense for restricted shares awarded | ​ | ​ | 439 | ​ | ​ | 380
Income tax benefit from compensation expense related to restricted awards | ​ | $ | 112 | ​ | $ | 94

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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 http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&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 http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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