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SHARE-BASED COMPENSATION AND BENEFIT PLANS (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-Based Compensation and Benefit Plans |
Summary of shares authorized and available for future issuance under compensation and benefit plans | ​
​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2021
​ |  | Total Shares Authorized for |  | Shares Available for Future
Plans | ​ | Issuance under the Plans | ​ | Issuance under the Plans
Incentive Plans |  | 35,650 |  | 5,742
Employee Stock Purchase Plan |  | 4,250 |  | 469
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, 2020 |  | 1,500 | ​ | $ | 248.52 |  |  | ​ |  | ​ |
Granted |  | 134 | ​ |  | 491.71 |  |  | ​ |  | ​ |
Exercised |  | (404) | ​ |  | 167.78 |  |  | ​ |  | ​ |
Forfeited or expired |  | (24) | ​ |  | 372.95 |  |  | ​ |  | ​ |
Outstanding at December 31, 2021 |  | 1,206 | ​ | $ | 300.09 |  | 5.8 | Years | ​ | $ | 489,893
Vested or expected to vest at December 31, 2021 |  | 1,182 | ​ | $ | 297.47 |  | 5.7 | Years | ​ | $ | 483,286
Exercisable at December 31, 2021 |  | 802 | ​ | $ | 249.13 |  | 4.7 | Years | ​ | $ | 366,680
Black-Scholes option pricing model | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2021 | ​ | 2020 | ​ | 2019
Risk free interest rate |  | 0.82 | % | ​ | 0.86 | % | ​ | 2.26 | %
Expected life |  | 5.9 | Years | ​ | 5.9 | Years | ​ | 5.7 | Years
Expected volatility |  | 30.0 | % | ​ | 26.4 | % | ​ | 25.1 | %
Expected dividend yield |  | — | % | ​ | — | % | ​ | — | %
Summary of activity of share-based compensation and benefit plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended
​ | ​ | December 31,
​ |  | 2021 | ​ | 2020 | ​ | 2019
Compensation expense for stock options awarded (in thousands) | ​ | $ | 20,035 | ​ | $ | 18,435 | ​ | $ | 18,044
Income tax benefit from compensation expense related to stock options (in thousands) | ​ |  | 4,989 | ​ |  | 4,620 | ​ |  | 4,436
Total intrinsic value of stock options exercised (in thousands) | ​ |  | 163,722 | ​ |  | 79,451 | ​ |  | 117,489
Cash received from exercise of stock options (in thousands) | ​ |  | 67,761 | ​ |  | 46,282 | ​ |  | 46,106
Weighted-average grant-date fair value of options awarded | ​ | $ | 146.57 | ​ | $ | 106.76 | ​ | $ | 105.37
Weighted-average remaining contractual life of exercisable options (in years) | ​ |  | 4.7 | ​ |  | 4.5 | ​ |  | 4.6
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,
​ |  | 2021 |  | 2020 |  | 2019
Compensation expense for restricted shares awarded | ​ | $ | 1,602 | ​ | $ | 1,488 | ​ | $ | 1,387
Income tax benefit from compensation expense related to restricted shares | ​ | $ | 399 | ​ | $ | 373 | ​ | $ | 341
Total fair value of restricted shares at vest date | ​ | $ | 2,815 | ​ | $ | 1,591 | ​ | $ | 1,633
Shares awarded under the plans | ​ |  | 3 | ​ |  | 4 | ​ |  | 4
Weighted-average grant-date fair value of shares awarded under the plans | ​ | $ | 509.24 | ​ | $ | 412.67 | ​ | $ | 355.91
Employee stock purchase plan [Member] |
Share-Based Compensation and Benefit Plans |
Summary of ESPP plan activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended
​ | ​ | December 31,
​ |  | 2021 |  | 2020 |  | 2019
Compensation expense for shares issued under the ESPP | ​ | $ | 3,019 | ​ | $ | 2,824 | ​ | $ | 2,490
Income tax benefit from compensation expense related to shares issued under the ESPP | ​ | $ | 752 | ​ | $ | 708 | ​ | $ | 612
Shares issued under the ESPP | ​ |  | 36 | ​ |  | 45 | ​ |  | 43
Weighted-average price of shares issued under the ESPP | ​ | $ | 473.22 | ​ | $ | 353.04 | ​ | $ | 329.69
Employee [Member] | Restricted stock [Member] |
Share-Based Compensation and Benefit Plans |
Summary of restricted stock | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-Average Grant-Date
​ |  | Shares |  | Fair Value
Non-vested at December 31, 2020 |  | 4 | ​ | $ | 358.58
Granted during the period |  | 1 | ​ |  | 451.84
Vested during the period (1) |  | (2) | ​ |  | 430.04
Forfeited during the period |  | — | ​ |  | —
Non-vested at December 31, 2021 |  | 3 | ​ | $ | 419.47
(1) | Includes less than one thousand shares withheld to cover employees’ taxes upon vesting.
​
Director [Member] | Restricted stock [Member] |
Share-Based Compensation and Benefit Plans |
Summary of restricted stock | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-Average Grant-Date
​ |  | Shares |  | Fair Value
Non-vested at December 31, 2020 |  | 4 | ​ | $ | 371.46
Granted during the period |  | 1 | ​ |  | 559.53
Vested during the period |  | (3) | ​ |  | 556.74
Forfeited during the period |  | — | ​ |  | —
Non-vested at December 31, 2021 |  | 2 | ​ | $ | 508.45

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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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