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STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2019

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,			​
​		2019		2018		2019		2018	​
Dividend yield		0	%	0	%	0	%	0	%
Expected volatility		30.2	%	34.5	%	30.2	%	34.9	%
Risk-free interest rate		1.4	%	2.9	%	2.4	%	2.8	%
Expected term		5.8	years	6.1	years	6.0	years	6.1	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, 2019		18,890	​	$	34.61		5.8	​	$	303,627
Granted 01/01/19 - 03/31/19		1,570	​	$	59.52	​	​	​	​	​
Granted 04/01/19 - 06/30/19	​	—	​	$	—	​	​	​	​	​
Granted 07/01/19 - 09/30/19	​	52	​	$	58.54	​	​	​	​	​
Exercised		(4,999)	​	$	17.05	​	​	​	​	​
Cancelled or forfeited		(373)	​	$	50.42	​	​	​	​	​
Outstanding at September 30, 2019		15,140	​	$	42.69		6.5	​	$	237,041
Vested and expected to vest in the future at September 30, 2019		14,290	​	$	41.98		6.4	​	$	233,489
Exercisable at September 30, 2019		7,557	​	$	33.14		5.2	​	$	188,583

​

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, 2019		529	​	$	51.55
Granted 01/01/19 - 03/31/19		548	​	$	59.66
Granted 04/01/19 - 06/30/19	​	18	​	$	63.48
Granted 07/01/19 - 09/30/19	​	1	​	$	66.00
Vested		(265)	​	$	50.10
Forfeited/cancelled		(6)	​	$	59.67
Non-vested at September 30, 2019		825	​	$	57.63

​

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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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