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SHARE-BASED COMPENSATION AND BENEFIT PLANS (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-Based Compensation and Benefit Plans |
Summary of shares authorized and available for future issuance under compensation and benefit plans | ​
​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ |  | Total Shares Authorized for |  | Shares Available for Future
Plans | ​ | Issuance under the Plans | ​ | Issuance under the Plans
Incentive Plans |  | 35,650 |  | 5,492
Employee Stock Purchase Plan |  | 4,250 |  | 412
Profit Sharing and Savings Plan |  | 4,200 |  | 349
Employee Stock Option [Member] |
Share-Based Compensation and Benefit Plans |
Summary of stock options | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ |  | Average |  | Aggregate
​ | ​ | Shares | ​ | Weighted- Average | ​ | Remaining | ​ | Intrinsic Value
​ | ​ | (in thousands) | ​ | Exercise Price | ​ | Contractual Terms | ​ | (in thousands)
Outstanding at December 31, 2022 |  | 1,069 | ​ | $ | 356.76 |  |  | ​ |  | ​ |
Granted |  | 94 | ​ |  | 861.57 |  |  | ​ |  | ​ |
Exercised |  | (260) | ​ |  | 273.94 |  |  | ​ |  | ​ |
Forfeited or expired |  | (19) | ​ |  | 652.81 |  |  | ​ |  | ​ |
Outstanding at December 31, 2023 |  | 884 | ​ | $ | 428.50 |  | 5.3 | Years | ​ | $ | 461,145
Vested or expected to vest at December 31, 2023 |  | 853 | ​ | $ | 414.37 |  | 5.2 | Years | ​ | $ | 456,945
Exercisable at December 31, 2023 |  | 627 | ​ | $ | 330.25 |  | 4.2 | Years | ​ | $ | 388,517
Black-Scholes option pricing model | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2023 | ​ | 2022 | ​ | 2021
Risk free interest rate |  | 3.96 | % | ​ | 2.09 | % | ​ | 0.82 | %
Expected life |  | 6.3 | Years | ​ | 6.3 | Years | ​ | 5.9 | Years
Expected volatility |  | 29.0 | % | ​ | 28.9 | % | ​ | 30.0 | %
Expected dividend yield |  | — | % | ​ | — | % | ​ | — | %
Summary of activity of share-based compensation and benefit plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended
​ | ​ | December 31,
​ |  | 2023 | ​ | 2022 | ​ | 2021
Compensation expense for stock options awarded (in thousands) | ​ | $ | 22,090 | ​ | $ | 21,412 | ​ | $ | 20,035
Income tax benefit from compensation expense related to stock options (in thousands) | ​ |  | 5,477 | ​ |  | 5,332 | ​ |  | 4,989
Total intrinsic value of stock options exercised (in thousands) | ​ |  | 170,521 | ​ |  | 123,911 | ​ |  | 163,722
Cash received from exercise of stock options (in thousands) | ​ |  | 71,153 | ​ |  | 60,976 | ​ |  | 67,761
Weighted-average grant-date fair value of options awarded | ​ | $ | 323.16 | ​ | $ | 221.19 | ​ | $ | 146.57
Weighted-average remaining contractual life of exercisable options (in years) | ​ |  | 5.3 | ​ |  | 4.5 | ​ |  | 4.7
Restricted stock [Member] |
Share-Based Compensation and Benefit Plans |
Summary of activity of share-based compensation and benefit plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended
​ | ​ | December 31,
​ |  | 2023 |  | 2022 |  | 2021
Compensation expense for restricted shares awarded | ​ | $ | 1,869 | ​ | $ | 1,808 | ​ | $ | 1,602
Income tax benefit from compensation expense related to restricted shares | ​ | $ | 463 | ​ | $ | 450 | ​ | $ | 399
Total fair value of restricted shares at vest date | ​ | $ | 2,693 | ​ | $ | 2,595 | ​ | $ | 2,815
Shares awarded under the plans | ​ |  | 2 | ​ |  | 3 | ​ |  | 3
Weighted-average grant-date fair value of shares awarded under the plans | ​ | $ | 888.60 | ​ | $ | 645.31 | ​ | $ | 509.24
Summary of restricted stock | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-Average Grant-Date
​ |  | Shares |  | Fair Value
Non-vested at December 31, 2022 |  | 4 | ​ | $ | 572.54
Granted during the period |  | 2 | ​ |  | 888.60
Vested during the period (1) |  | (3) | ​ |  | 571.45
Forfeited during the period |  | — | ​ |  | —
Non-vested at December 31, 2023 |  | 3 | ​ | $ | 772.45
(1) | Includes less than one thousand shares withheld to cover employees’ taxes upon vesting.
​
Employee stock purchase plan [Member] |
Share-Based Compensation and Benefit Plans |
Summary of ESPP plan activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended
​ | ​ | December 31,
​ |  | 2023 |  | 2022 |  | 2021
Compensation expense for shares issued under the ESPP | ​ | $ | 3,552 | ​ | $ | 3,238 | ​ | $ | 3,019
Income tax benefit from compensation expense related to shares issued under the ESPP | ​ | $ | 881 | ​ | $ | 806 | ​ | $ | 752
Shares issued under the ESPP | ​ |  | 26 | ​ |  | 31 | ​ |  | 36
Weighted-average price of shares issued under the ESPP | ​ | $ | 766.11 | ​ | $ | 592.22 | ​ | $ | 473.22

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