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STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2019

STOCK-BASED COMPENSATION

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

​

​	​	​	​	​	​	​	​
​		2019		2018		2017
Dividend yield	​	0.0	%	0.0	%	0.0	%
Expected volatility	​	30.2	%	34.7	%	36.5	%
Risk-free interest rate	​	2.37	%	2.81	%	2.11	%
Expected term	​	6.0 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	​	Aggregate
​	​	Shares (in	​	Price Per		​	Term (In	​	Intrinsic
Options		thousands)		Share			years)		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	​	​	​	​	​
Granted 10/01/19 - 12/31/19		50	​	$	56.39	​	​	​	​	​
Exercised		(5,224)	​	$	17.68	​	​	​	​	​
Cancelled or forfeited		(397)	​	$	50.83	​	​	​	​	​
Outstanding at December 31, 2019		14,941	​	$	42.88		6.3	​	$	308,884
Vested and expected to vest in the future at December 31, 2019		14,205	​	$	42.25		6.2	​	$	302,587
Exercisable at December 31, 2019		7,758	​	$	33.70		5.0	​	$	231,600

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 (In	​	Contractual	​	Exercise		​	(In	​	Exercise
Prices ($)						Thousands)		Term (Years)		Price ($)			Thousands)		Price ($)
$	6.40	-	$	17.99		1,741		3.2	​	$	16.88		1,741	​	$	16.88
$	18.64	-	$	23.35		1,852		4.1	​	$	22.92		1,852	​	$	22.92
$	36.05	-	$	36.05		12		5.0	​	$	36.05		8	​	$	36.05
$	37.10	-	$	43.64		1,457		6.4	​	$	42.06		757	​	$	40.91
$	43.99	-	$	43.99		1,925		6.2	​	$	43.99		1,088	​	$	43.99
$	44.73	-	$	45.16		2,002		5.5	​	$	45.10		1,336	​	$	45.11
$	45.55	-	$	51.50		1,621		7.4	​	$	47.60		578	​	$	46.56
$	53.24	-	$	57.95		382		8.8	​	$	55.85		39	​	$	54.80
$	58.73	-	$	58.73		2,371		8.2	​	$	58.73		345	​	$	58.73
$	58.77	-	$	63.46		1,578		9.2	​	$	59.79		14	​	$	62.50
​	​	​	​	​		14,941		6.3	​	$	42.88		7,758	​	$	33.70

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

​

​	​	​	​	​	​
​	​	​	​	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
Granted 10/01/19 - 12/31/19	​	1	​	$	55.73
Vested	​	(266)	​	$	50.12
Forfeited/cancelled	​	(6)	​	$	59.67
Non-vested at December 31, 2019	​	825	​	$	57.62

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

​

​	​	​	​	​	​	​	​	​	​
​		2019			2018			2017
Operating expenses	​	$	63,356	​	$	57,111	​	$	52,282
Total employee and non-employee share-based compensation expense included in income, before income tax	​		63,356	​		57,111	​		52,282
Less: Amount of income tax benefit recognized in earnings	​		(36,326)	​		(14,892)	​		(100,635)
Amount charged against net income	​	$	27,030	​	$	42,219	​	$	(48,353)

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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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