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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2020
STOCK-BASED COMPENSATION |
Schedule of weighted-average assumptions used to estimate the fair value of options granted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ |  | 2020 |  | 2019 |  | 2018 |
Dividend yield | ​ | ​ | 0.0 | % | 0.0 | % | 0.0 | %
Expected volatility | ​ | ​ | 30.4 | % | 30.2 | % | 34.7 | %
Risk-free interest rate | ​ | ​ | 0.70 | % | 2.37 | % | 2.81 | %
Expected term | ​ | ​ | 5.8 Years | ​ | 6.0 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 (in | ​ | Price Per | ​ | Term (In | ​ | Intrinsic
Options |  | thousands) |  | Share |  | years) |  | Value
Outstanding at January 1, 2020 |  | 14,941 | ​ | $ | 42.88 |  | 6.3 | ​ | $ | 308,884
Granted 01/01/20 - 03/31/20 |  | 1,027 | ​ | $ | 62.45 | ​ | ​ | ​ | ​ | ​
Granted 04/01/20 - 06/30/20 |  | — | ​ | $ | — | ​ | ​ | ​ | ​ | ​
Granted 07/01/20 - 09/30/20 |  | — | ​ | $ | — | ​ | ​ | ​ | ​ | ​
Granted 10/01/20 - 12/31/20 |  | 12 | ​ | $ | 77.92 | ​ | ​ | ​ | ​ | ​
Exercised |  | (1,916) | ​ | $ | 38.06 | ​ | ​ | ​ | ​ | ​
Cancelled or forfeited |  | (91) | ​ | $ | 54.41 | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2020 |  | 13,973 | ​ | $ | 44.93 |  | 5.7 | ​ | $ | 664,432
Vested and expected to vest in the future at December 31, 2020 |  | 13,463 | ​ | $ | 44.43 |  | 5.7 | ​ | $ | 646,907
Exercisable at December 31, 2020 |  | 8,323 | ​ | $ | 37.36 |  | 4.5 | ​ | $ | 458,734
Summary of information about stock options outstanding and exercisable | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Options Outstanding | ​ | Options Exercisable
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Average | ​ | Weighted | ​ | Number | ​ | Weighted
​ | ​ | ​ | ​ | ​ | ​ | Number | ​ | Remaining | ​ | Average | ​ | Exercisable | ​ | Average
Range of Exercise | ​ | Outstanding (In | ​ | Contractual | ​ | Exercise | ​ | (In | ​ | Exercise
Prices ($) |  | Thousands) |  | Term (Years) |  | Price ($) |  | Thousands) |  | Price ($)
$ | 11.35 | - | $ | 17.99 |  | 1,483 |  | 2.3 |  | $ | 17.58 |  | 1,483 |  | $ | 17.58
$ | 18.64 | - | $ | 23.35 |  | 1,613 |  | 3.1 |  | $ | 23.05 |  | 1,613 |  | $ | 23.05
$ | 36.05 | - | $ | 36.05 |  | 9 |  | 4.0 |  | $ | 36.05 |  | 9 |  | $ | 36.05
$ | 37.10 | - | $ | 43.64 |  | 1,033 |  | 5.6 |  | $ | 42.75 |  | 681 |  | $ | 42.33
$ | 43.99 | - | $ | 43.99 |  | 1,641 |  | 5.2 |  | $ | 43.99 |  | 1,185 |  | $ | 43.99
$ | 44.73 | - | $ | 45.16 |  | 1,581 |  | 4.5 |  | $ | 45.10 |  | 1,494 |  | $ | 45.11
$ | 45.55 | - | $ | 51.50 |  | 1,478 |  | 6.4 |  | $ | 47.61 |  | 826 |  | $ | 46.46
$ | 53.24 | - | $ | 57.95 |  | 335 |  | 7.7 |  | $ | 55.79 |  | 65 |  | $ | 54.82
$ | 58.73 | - | $ | 58.73 |  | 2,230 |  | 7.2 |  | $ | 58.73 |  | 680 |  | $ | 58.73
$ | 58.77 | - | $ | 77.92 |  | 2,570 |  | 8.6 |  | $ | 60.93 |  | 287 |  | $ | 59.86
​ | ​ | ​ | ​ | ​ |  | 13,973 |  | 5.7 |  | $ | 44.93 |  | 8,323 |  | $ | 37.36
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, 2020 | ​ | 825 | ​ | $ | 57.62
Granted 01/01/20 - 03/31/201 | ​ | 392 | ​ | $ | 62.39
Granted 04/01/20 - 06/30/20 | ​ | 17 | ​ | $ | 71.72
Granted 07/01/20 - 09/30/20 | ​ | 1 | ​ | $ | 71.76
Granted 10/01/20 - 12/31/20 | ​ | 5 | ​ | $ | 78.04
Vested | ​ | (287) | ​ | $ | 55.65
Forfeited/cancelled | ​ | (6) | ​ | $ | 64.72
Non-vested at December 31, 2020 | ​ | 947 | ​ | $ | 60.52
Schedule of employee and non-employee share-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018
Operating expenses |  | $ | 70,289 |  | $ | 63,356 |  | $ | 57,111
Total employee and non-employee share-based compensation expense included in income, before income tax | ​ | ​ | 70,289 | ​ | ​ | 63,356 | ​ | ​ | 57,111
Less: Amount of income tax benefit recognized in earnings | ​ | ​ | (15,499) | ​ | ​ | (36,326) | ​ | ​ | (14,892)
Amount charged against net income |  | $ | 54,790 |  | $ | 27,030 |  | $ | 42,219

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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