STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2017

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,
	2017	2016	2017	2016
Dividend yield	0.0%	0.0%	0.0%	0.0%
Expected volatility	35.3%	36.3%	36.6%	36.1%
Risk-free interest rate	1.7%	1.1%	2.1%	1.4%
Expected term	5.9 years	6.4 years	6.1 years	6.3 years

Summary of Company's activities with respect to its stock option plans

Options	Number of Shares (In thousands)	Weighted- Average Exercise Price Per Share		Weighted- Average Remaining Contractual Term (In years)	Aggregate Intrinsic Value
Outstanding at January 1, 2017	22,643	$	23.55	5.8	$	474,739
Granted 01/01/17 - 03/31/17	1,319	$	45.94
Granted 04/01/17 - 06/30/17	26	$	49.71
Granted 07/01/17 - 09/30/17	12	$	56.08
Exercised	(1,643)	$	16.30
Cancelled or forfeited	(391)	$	39.32
Outstanding at September 30, 2017	21,966	$	25.20	5.4	$	659,989
Vested and expected to vest in the
future at September 30, 2017	20,870	$	24.26	5.2	$	646,739
Exercisable at September 30, 2017	13,030	$	14.29	3.4	$	533,683

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

	Number of Shares (in thousands)	Weighted Average Grant-Date Fair Value
Non-vested at January 1, 2017	556	$	39.95
Granted 01/01/17- 03/31/17	252	$	46.27
Granted 04/01/17- 06/30/17	23	$	50.86
Granted 07/01/17- 09/30/17	-	$	-
Vested	(289)	$	37.64
Forfeited/cancelled	(2)	$	20.69
Non-vested at September 30, 2017	540	$	44.67