STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2016

STOCK-BASED COMPENSATION

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

	Three-Months Ended June 30,		Six-Months Ended June 30,
	2016	2015	2016	2015
Dividend yield	0.0%	0.0%	0.0%	0.0%
Expected volatility	36.2%	37.0%	36.2%	37.1%
Risk-free interest rate	1.3%	1.5%	1.4%	1.6%
Expected term	6.4 years	5.8 years	6.3 years	5.8 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, 2016	6,590	$	50.85	5.6	$	646,497
Granted 01/01/16 - 03/31/16	961	$	132.06
Granted 04/01/16 - 06/30/16	219	$	138.53
Exercised	(210)	$	38.89
Cancelled or forfeited	(81)	$	94.97
Outstanding at June 30, 2016	7,479	$	63.72	5.8	$	725,436
Vested and expected to vest in the future at June 30, 2016	7,031	$	60.23	5.6	$	706,495
Exercisable at June 30, 2016	4,350	$	31.24	3.9	$	563,212

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

	Number of Shares (in thousands)	Weighted Average Grant-Date Fair Value
Non-vested at January 1, 2016	178	$	99.58
Granted 01/01/16- 03/31/16	82	$	131.96
Granted 04/01/16- 06/30/16	12	$	148.94
Vested	(68)	$	104.32
Forfeited/cancelled	(1)	$	57.45
Non-vested at June 30, 2016	203	$	114.26