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STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2024

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,			​
​		2024		2023		2024		2023	​
Dividend yield	​	0.0	%	0.0	%	0.0	%	0.0	%
Expected volatility	​	27.5	%	27.4	%	27.5	%	27.6	%
Risk-free interest rate	​	4.4	%	3.7	%	4.3	%	3.7	%
Expected term	​	6.4	years	6.3	years	6.4	years	6.3	years

Schedule of activities with respect to its stock option plans

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​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	Weighted-	​	​	​
​	​	​	​	​		​	Average	​	​	​
​	​	​	​	Weighted-		​	Remaining	​	​	​
​	​	Number of	​	Average		​	Contractual	​	​	​
​	​	Shares	​	Exercise Price		​	Term	​	Aggregate
Options		(in thousands)		Per Share			(in years)		Intrinsic Value
Outstanding at January 1, 2024		24,983	​	$	33.64		5.8	​	$	598,866
Granted 01/01/24 - 03/31/24		4,332	​	$	60.29	​	​	​	​	​
Granted 04/01/24 - 06/30/24		62	​	$	51.89	​	​	​	​	​
Exercised		(1,914)	​	$	27.22	​	​	​	​	​
Cancelled or forfeited		(165)	​	$	48.17	​	​	​	​	​
Outstanding at June 30, 2024		27,298	​	$	38.27		6.1	​	$	366,872
Vested and expected to vest in the future at June 30, 2024	​	26,202	​	$	37.70	​	6.0	​	$	363,597
Exercisable at June 30, 2024	​	15,087	​	$	29.21	​	4.1	​	$	313,348

Schedule of activities with respect to non-vested restricted stock units and performance share units

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​	​	​	​	​	​
​	​	Number of Shares	​	Weighted Average Grant-
​		(in thousands)		Date Fair Value
Non-vested at January 1, 2024	​	1,964	​	$	40.95
Granted 01/01/24 - 03/31/241	​	502	​	$	57.04
Granted 04/01/24 - 06/30/24	​	27	​	$	49.12
Vested	​	(824)	​	$	40.69
Forfeited/cancelled	​	(1)	​	$	30.62
Non-vested at June 30, 2024	​	1,668	​	$	46.06

​

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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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.

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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.

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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.

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