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STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2021

STOCK-BASED COMPENSATION

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

​

​	​	​	​	​	​
​	​	Three-Months Ended March 31,			​
​		2021		2020
Dividend yield	​	0.0	%	0.0	%
Expected volatility	​	28.9	%	30.5	%
Risk-free interest rate	​	0.8	%	0.7	%
Expected term	​	5.8	years	5.8	years

Summary of activities with respect to its stock option plans

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​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	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, 2021		13,973	​	$	44.93		5.7	​	$	664,432
Granted 01/01/21 - 03/31/21		1,015	​	$	88.95	​	​	​	​	​
Exercised		(157)	​	$	43.04	​	​	​	​	​
Cancelled or forfeited		(5)	​	$	60.28	​	​	​	​	​
Outstanding at March 31, 2021		14,826	​	$	47.96		5.8	​	$	639,489
Vested and expected to vest in the future at March 31, 2021		14,463	​	$	47.44		5.7	​	$	631,268
Exercisable at March 31, 2021		9,883	​	$	40.24		4.7	​	$	502,521

​

Summary of activities with respect to non-vested restricted stock units

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​	​	​	​	​	​
​	​	​	​	Weighted
​	​	Number of	​	Average
​	​	Shares (in	​	Grant-Date
​		thousands)		Fair Value
Non-vested at January 1, 2021	​	947	​	$	60.52
Granted 01/01/21 - 03/31/211	​	304	​	$	86.28
Vested	​	(335)	​	$	62.43
Forfeited/cancelled	​	(1)	​	$	62.39
Non-vested at March 31, 2021	​	915	​	$	68.37

​

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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-Name Accounting Standards Codification
-Topic 718
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-Section 50
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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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