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STOCK-BASED COMPENSATION (Tables) | 9 Months Ended
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Sep. 30, 2025
STOCK-BASED COMPENSATION |
Schedule of weighted-average assumptions used to estimate the fair value of options granted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three-Months Ended September 30, | ​ | Nine-Months Ended September 30, | ​
​ |  | 2025 |  | 2024 |  | 2025 |  | 2024 | ​
Dividend yield | ​ | — | ​ | 0.0 | % | 0.0 | % | 0.0 | %
Expected volatility | ​ | — | ​ | 26.9 | % | 26.7 | % | 27.4 | %
Risk-free interest rate | ​ | — | ​ | 3.7 | % | 4.2 | % | 4.2 | %
Expected term | ​ | — | ​ | 6.3 | years | 6.2 | years | 6.4 | years
Schedule of activities with respect to its stock option plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted- | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted- | ​ | Remaining | ​ | ​ | ​
​ | ​ | Number of | ​ | Average | ​ | Contractual | ​ | Aggregate
​ | ​ | Shares | ​ | Exercise Price | ​ | Term | ​ | Intrinsic
Options |  | (in thousands) |  | Per Share |  | (in years) |  | Value
Outstanding at January 1, 2025 |  | 27,088 | ​ | $ | 38.98 |  | 5.8 | ​ | $ | 400,207
Granted 01/01/25 - 03/31/25 |  | 1,299 | ​ | $ | 55.09 | ​ | ​ | ​ | ​ | ​
Granted 04/01/25 - 06/30/25 |  | 21 | ​ | $ | 60.28 | ​ | ​ | ​ | ​ | ​
Granted 07/01/25 - 09/30/25 |  | — | ​ | $ | — | ​ | ​ | ​ | ​ | ​
Exercised |  | (4,017) | ​ | $ | 28.47 | ​ | ​ | ​ | ​ | ​
Cancelled or forfeited |  | (317) | ​ | $ | 52.53 | ​ | ​ | ​ | ​ | ​
Outstanding at September 30, 2025 |  | 24,074 | ​ | $ | 41.45 |  | 5.7 | ​ | $ | 622,667
Vested and expected to vest in the future at September 30, 2025 | ​ | 23,366 | ​ | $ | 41.09 | ​ | 5.7 | ​ | $ | 612,710
Exercisable at September 30, 2025 | ​ | 13,120 | ​ | $ | 33.17 | ​ | 3.9 | ​ | $ | 447,884
Schedule of activities with respect to non-vested restricted stock units and performance share units | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Number of Shares | ​ | Weighted-Average
​ |  | (in thousands) |  | Grant-Date Fair Value
Non-vested at January 1, 2025 | ​ | 1,682 | ​ | $ | 46.16
Granted 01/01/25 - 03/31/251 | ​ | 1,017 | ​ | $ | 55.08
Granted 04/01/25 - 06/30/25 | ​ | 33 | ​ | $ | 62.68
Granted 07/01/25 - 09/30/25 | ​ | 1 | ​ | $ | 61.59
Vested | ​ | (631) | ​ | $ | 39.40
Forfeited/cancelled | ​ | (63) | ​ | $ | 42.44
Non-vested at September 30, 2025 | ​ | 2,039 | ​ | $ | 53.09
​ 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 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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