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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2022
STOCK-BASED COMPENSATION |
Schedule of weighted-average assumptions used to estimate the fair value of options granted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021 |  | 2020 |
Dividend yield | ​ | 0.0 | % | 0.0 | % | 0.0 | %
Expected volatility | ​ | 27.7 | % | 28.9 | % | 30.4 | %
Risk-free interest rate | ​ | 2.15 | % | 0.85 | % | 0.70 | %
Expected term | ​ | 6.1 Years | ​ | 5.8 Years | ​ | 5.8 Years | ​
​
Summary of activities with respect to its stock option plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted- | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted- | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | ​ | ​
​ | ​ | Number of | ​ | Exercise | ​ | Contractual | ​ | Aggregate
​ | ​ | Shares | ​ | Price Per | ​ | Term (in | ​ | Intrinsic
Options |  | (in thousands) |  | Share |  | years) |  | Value
Outstanding at January 1, 2022 |  | 13,860 | ​ | $ | 48.19 |  | 5.1 | ​ | $ | 663,148
Granted 01/01/22 - 03/31/22 |  | 2,489 | ​ | $ | 73.96 | ​ | ​ | ​ | ​ | ​
Granted 04/01/22 - 06/30/22 |  | 8 | ​ | $ | 88.05 | ​ | ​ | ​ | ​ | ​
Granted 07/01/22 - 09/30/22 |  | 34 | ​ | $ | 95.72 | ​ | ​ | ​ | ​ | ​
Granted 10/01/22 - 12/31/22 |  | 32 | ​ | $ | 91.10 | ​ | ​ | ​ | ​ | ​
Exercised |  | (1,411) | ​ | $ | 45.37 | ​ | ​ | ​ | ​ | ​
Cancelled or forfeited |  | (157) | ​ | $ | 72.15 | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2022 |  | 14,855 | ​ | $ | 52.75 |  | 5.0 | ​ | $ | 724,651
Vested and expected to vest in the future at December 31, 2022 | ​ | 14,509 | ​ | $ | 52.22 | ​ | 4.9 | ​ | $ | 715,462
Exercisable at December 31, 2022 |  | 9,764 | ​ | $ | 42.81 |  | 3.4 | ​ | $ | 573,325
​
Summary of information about stock options outstanding and exercisable | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Options Outstanding | ​ | Options Exercisable
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted Average | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Remaining | ​ | Weighted | ​ | Number | ​ | Weighted
​ | ​ | ​ | ​ | ​ | ​ | Number | ​ | Contractual | ​ | Average | ​ | Exercisable | ​ | Average
Range of Exercise | ​ | Outstanding | ​ | Term | ​ | Exercise | ​ | (In | ​ | Exercise
Prices ($) |  | (In Thousands) |  | (Years) |  | Price ($) |  | Thousands) |  | Price ($)
$ | 15.71 | - | $ | 36.05 |  | 2,768 |  | 0.8 |  | $ | 20.75 |  | 2,768 |  | $ | 20.75
$ | 37.10 | - | $ | 43.99 |  | 1,751 |  | 3.3 |  | $ | 43.43 |  | 1,751 |  | $ | 43.43
$ | 44.92 | - | $ | 46.27 |  | 2,189 |  | 3.2 |  | $ | 45.60 |  | 2,189 |  | $ | 45.60
$ | 48.11 | - | $ | 57.95 |  | 529 |  | 5.5 |  | $ | 53.29 |  | 313 |  | $ | 52.96
$ | 58.73 | - | $ | 58.73 |  | 1,818 |  | 5.2 |  | $ | 58.73 |  | 1,310 |  | $ | 58.73
$ | 58.77 | - | $ | 62.39 |  | 2,247 |  | 6.6 |  | $ | 60.80 |  | 1,252 |  | $ | 60.53
$ | 62.92 | - | $ | 67.42 |  | 43 |  | 6.1 |  | $ | 64.19 |  | 26 |  | $ | 63.46
$ | 73.23 | - | $ | 73.23 |  | 2,263 |  | 9.2 |  | $ | 73.23 |  | — |  | $ | —
$ | 77.92 | - | $ | 97.80 |  | 1,237 |  | 8.4 |  | $ | 88.32 |  | 155 |  | $ | 89.02
$ | 98.49 | - | $ | 98.49 |  | 10 |  | 9.6 |  | $ | 98.49 |  | — |  | $ | —
​ | ​ | ​ | ​ | ​ |  | 14,855 |  | 5.0 |  | $ | 52.75 |  | 9,764 |  | $ | 42.81
​
Summary of activities with respect to non-vested restricted stock units and performance share units | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | Number of | ​ | Average
​ | ​ | Shares (in | ​ | Grant-Date
​ |  | thousands) |  | Fair Value
Non-vested at January 1, 2022 | ​ | 910 | ​ | $ | 69.02
Granted 01/01/22 - 03/31/221 | ​ | 484 | ​ | $ | 71.88
Granted 04/01/22 - 06/30/22 | ​ | 15 | ​ | $ | 87.52
Granted 07/01/22 - 09/30/22 | ​ | 6 | ​ | $ | 95.17
Granted 10/01/22 - 12/31/22 | ​ | 1 | ​ | $ | 90.29
Vested | ​ | (389) | ​ | $ | 64.59
Forfeited/cancelled | ​ | (14) | ​ | $ | 68.27
Non-vested at December 31, 2022 | ​ | 1,013 | ​ | $ | 72.54
​
Schedule of employee and non-employee share-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021 |  | 2020
Operating expenses |  | $ | 64,109 |  | $ | 70,483 |  | $ | 70,289
Total employee and non-employee share-based compensation expense included in income, before income tax | ​ | ​ | 64,109 | ​ | ​ | 70,483 | ​ | ​ | 70,289
Less: Amount of income tax benefit recognized in earnings | ​ | ​ | (13,175) | ​ | ​ | (14,228) | ​ | ​ | (15,499)
Amount charged against net income |  | $ | 50,934 |  | $ | 56,255 |  | $ | 54,790

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