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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2021
STOCK-BASED COMPENSATION |
Schedule of weighted-average assumptions used to estimate the fair value of options granted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  |  | 2021 |  | 2020 |  | 2019 |
Dividend yield | ​ | ​ | 0.0 | % | 0.0 | % | 0.0 | %
Expected volatility | ​ | ​ | 28.9 | % | 30.4 | % | 30.2 | %
Risk-free interest rate | ​ | ​ | 0.85 | % | 0.70 | % | 2.37 | %
Expected term | ​ | ​ | 5.8 Years | ​ | 5.8 Years | ​ | 6.0 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, 2021 |  | 13,973 | ​ | $ | 44.93 |  | 5.7 | ​ | $ | 664,432
Granted 01/01/21 - 03/31/21 |  | 1,015 | ​ | $ | 88.95 | ​ | ​ | ​ | ​ | ​
Granted 04/01/21 - 06/30/21 |  | 13 | ​ | $ | 91.36 | ​ | ​ | ​ | ​ | ​
Granted 07/01/21 - 09/30/21 |  | 23 | ​ | $ | 95.33 | ​ | ​ | ​ | ​ | ​
Granted 10/01/21 - 12/31/21 |  | 12 | ​ | $ | 87.00 | ​ | ​ | ​ | ​ | ​
Exercised |  | (1,037) | ​ | $ | 44.10 | ​ | ​ | ​ | ​ | ​
Cancelled or forfeited |  | (139) | ​ | $ | 63.05 | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2021 |  | 13,860 | ​ | $ | 48.19 |  | 5.1 | ​ | $ | 663,148
Vested and expected to vest in the future at December 31, 2021 | ​ | 13,633 | ​ | $ | 47.80 | ​ | 5.0 | ​ | $ | 657,633
Exercisable at December 31, 2021 |  | 9,644 | ​ | $ | 40.33 |  | 4.0 | ​ | $ | 537,261
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 | - | $ | 17.99 |  | 1,395 |  | 1.4 |  | $ | 17.77 |  | 1,395 |  | $ | 17.77
$ | 18.64 | - | $ | 23.35 |  | 1,562 |  | 2.1 |  | $ | 23.08 |  | 1,562 |  | $ | 23.08
$ | 36.05 | - | $ | 36.05 |  | 9 |  | 3.0 |  | $ | 36.05 |  | 9 |  | $ | 36.05
$ | 37.10 | - | $ | 43.99 |  | 2,280 |  | 4.3 |  | $ | 43.47 |  | 2,272 |  | $ | 43.47
$ | 44.73 | - | $ | 45.16 |  | 1,410 |  | 3.4 |  | $ | 45.10 |  | 1,410 |  | $ | 45.10
$ | 45.55 | - | $ | 54.45 |  | 1,491 |  | 5.5 |  | $ | 48.21 |  | 1,058 |  | $ | 47.43
$ | 55.14 | - | $ | 57.95 |  | 153 |  | 7.1 |  | $ | 56.90 |  | 36 |  | $ | 56.57
$ | 58.73 | - | $ | 58.73 |  | 2,054 |  | 6.2 |  | $ | 58.73 |  | 1,084 |  | $ | 58.73
$ | 58.77 | - | $ | 58.77 |  | 4 |  | 6.6 |  | $ | 58.77 |  | 2 |  | $ | 58.77
$ | 59.67 | - | $ | 97.80 |  | 3,502 |  | 8.1 |  | $ | 69.29 |  | 816 |  | $ | 60.56
​ | ​ | ​ | ​ | ​ |  | 13,860 |  | 5.1 |  | $ | 48.19 |  | 9,644 |  | $ | 40.33
Summary of activities with respect to non-vested restricted stock units | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | Number of | ​ | Average
​ | ​ | Shares (in | ​ | Grant-Date
​ |  | thousands) |  | Fair Value
Non-vested at January 1, 2021 | ​ | 947 | ​ | $ | 60.52
Granted 01/01/21 - 03/31/211 | ​ | 304 | ​ | $ | 86.28
Granted 04/01/21 - 06/30/21 | ​ | 14 | ​ | $ | 92.14
Granted 07/01/21 - 09/30/21 | ​ | 1 | ​ | $ | 89.84
Granted 10/01/21 - 12/31/21 | ​ | 1 | ​ | $ | 89.95
Vested | ​ | (344) | ​ | $ | 62.29
Forfeited/cancelled | ​ | (13) | ​ | $ | 60.41
Non-vested at December 31, 2021 | ​ | 910 | ​ | $ | 69.02
Schedule of employee and non-employee share-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020 |  | 2019
Operating expenses |  | $ | 70,483 |  | $ | 70,289 |  | $ | 63,356
Total employee and non-employee share-based compensation expense included in income, before income tax | ​ | ​ | 70,483 | ​ | ​ | 70,289 | ​ | ​ | 63,356
Less: Amount of income tax benefit recognized in earnings | ​ | ​ | (14,228) | ​ | ​ | (15,499) | ​ | ​ | (36,326)
Amount charged against net income |  | $ | 56,255 |  | $ | 54,790 |  | $ | 27,030

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