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STOCK-BASED COMPENSATION (Tables) | 6 Months Ended
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Jun. 30, 2023
STOCK-BASED COMPENSATION |
Schedule of weighted-average assumptions used to estimate the fair value of options granted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three-Months Ended June 30, | ​ | Six-Months Ended June 30, | ​
​ |  | 2023 |  | 2022 | ​ | 2023 |  | 2022 | ​
Dividend yield | ​ | 0.0 | % | 0.0 | % | 0.0 | % | 0.0 | %
Expected volatility | ​ | 27.4 | % | 27.8 | % | 27.6 | % | 27.7 | %
Risk-free interest rate | ​ | 3.7 | % | 3.0 | % | 3.7 | % | 2.1 | %
Expected term | ​ | 6.3 years | ​ | 6.2 years | ​ | 6.3 years | ​ | 6.0 years | ​
Summary of activities with respect to its stock option plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted- | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted- | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | ​ | ​
​ | ​ | Number of | ​ | Exercise | ​ | Contractual | ​ | ​ | ​
​ | ​ | Shares (in | ​ | Price Per | ​ | Term (in | ​ | Aggregate
Options |  | thousands) |  | Share |  | years) |  | Intrinsic Value
Outstanding at January 1, 2023 |  | 29,710 | ​ | $ | 26.38 |  | 5.0 | ​ | $ | 724,651
Granted 01/01/23 - 03/31/23 |  | 3,962 | ​ | $ | 50.82 | ​ | ​ | ​ | ​ | ​
Granted 04/01/23 - 06/30/23 |  | 31 | ​ | $ | 59.36 | ​ | ​ | ​ | ​ | ​
Exercised |  | (3,990) | ​ | $ | 14.95 | ​ | ​ | ​ | ​ | ​
Cancelled or forfeited |  | (222) | ​ | $ | 37.82 | ​ | ​ | ​ | ​ | ​
Outstanding at June 30, 2023 |  | 29,491 | ​ | $ | 31.15 |  | 5.6 | ​ | $ | 775,296
Vested and expected to vest in the future at June 30, 2023 | ​ | 28,511 | ​ | $ | 30.71 | ​ | 5.4 | ​ | $ | 762,069
Exercisable at June 30, 2023 |  | 18,659 | ​ | $ | 24.70 |  | 3.8 | ​ | $ | 610,938
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, 2023 | ​ | 2,026 | ​ | $ | 36.27
Granted 01/01/23 - 03/31/231 | ​ | 523 | ​ | $ | 48.49
Granted 04/01/23 - 06/30/23 | ​ | 22 | ​ | $ | 59.70
Vested | ​ | (592) | ​ | $ | 32.80
Forfeited/cancelled | ​ | (11) | ​ | $ | 32.83
Non-vested at June 30, 2023 | ​ | 1,968 | ​ | $ | 40.85
​ 1The grant activity for performance share units is recorded based on the target performance level earning 100% of target performance share units. The actual number of performance share units earned could range from 0% to 200% of target depending on the achievement of pre-established performance goals.

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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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 -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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