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STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2024

STOCK-BASED COMPENSATION

Schedule of weighted-average assumptions used to estimate the fair value of options granted

​

​	​	​	​	​	​	​	​
​		2024		2023		2022
Dividend yield	​	0.0	%	0.0	%	0.0	%
Expected volatility	​	27.4	%	27.6	%	27.7	%
Risk-free interest rate	​	4.18	%	3.75	%	2.15	%
Expected term	​	6.4 Years	​	6.3 Years	​	6.1 Years	​

Schedule 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, 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	​	​	​	​	​
Granted 07/01/24 - 09/30/24		1,236	​	$	48.40	​	​	​	​	​
Granted 10/01/24 - 12/31/24		12	​	$	51.59	​	​	​	​	​
Exercised		(2,908)	​	$	27.16	​	​	​	​	​
Cancelled or forfeited		(629)	​	$	48.28	​	​	​	​	​
Outstanding at December 31, 2024		27,088	​	$	38.98		5.8	​	$	400,207
Vested and expected to vest in the future at December 31, 2024	​	26,124	​	$	38.49	​	5.7	​	$	396,642
Exercisable at December 31, 2024		14,169	​	$	29.39		3.7	​	$	328,318

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	​	Contractual	​	Exercise		​	(in	​	Exercise
Prices ($)						(in thousands)		Term (Years)		Price ($)			thousands)		Price ($)
$	18.03	-	$	22.46		3,036		1.3		$	22.02		3,036		$	22.02
$	22.51	-	$	29.37		5,108		2.8		$	26.63		5,108		$	26.63
$	29.84	-	$	31.20		3,715		4.6		$	30.42		3,400		$	30.35
$	31.46	-	$	33.71		53		4.6		$	32.49		42		$	32.37
$	36.62	-	$	36.62		3,978		7.2		$	36.62		1,088		$	36.62
$	38.96	-	$	48.30		3,191		7.6		$	45.75		1,049		$	44.36
$	48.90	-	$	48.90		20		6.7		$	48.90		9		$	48.90
$	50.82	-	$	50.82		3,641		8.2		$	50.82		430		$	50.82
$	51.38	-	$	59.36		207		9.1		$	53.81		7		$	55.56
$	60.30	-	$	60.30		4,139		9.2		$	60.30		—		$	—
​	​	​	​	​		27,088		5.8		$	38.98		14,169		$	29.39

Schedule 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, 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
Granted 07/01/24 - 09/30/24	​	32	​	$	48.40
Granted 10/01/24 - 12/31/24	​	2	​	$	49.24
Vested	​	(829)	​	$	40.71
Forfeited/cancelled	​	(16)	​	$	39.55
Non-vested at December 31, 2024	​	1,682	​	$	46.16

​

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.

Schedule of employee and non-employee share-based compensation expense

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​	​	​	​	​	​	​	​	​	​
​		2024			2023			2022
Operating expenses		$	90,985		$	68,836		$	64,109
Total employee and non-employee share-based compensation expense included in income, before income tax	​	​	90,985	​	​	68,836	​	​	64,109
Less: Amount of income tax benefit recognized in earnings	​	​	(16,006)	​	​	(64,401)	​	​	(13,175)
Amount charged against net income		$	74,979		$	4,435		$	50,934

​

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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.

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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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