STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2013

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,
	2013	2012	2013	2012
Dividend yield	0.0 %	0.0 %	0.0 %	0.0 %
Expected volatility	48.1 %	47.6 %	47.9 %	48.1 %
Risk-free interest rate	1.0 %	0.9 %	0.9 %	0.9 %
Expected term	6.1 Years	5.4 Years	5.7 Years	5.5 Years

Summary of 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, 2013	14,000	$	12.12	4.1	$	572,530
Granted 01/01/13 - 03/31/13	636	$	47.36
Granted 04/01/13 - 06/30/13	450	$	54.00
Exercised	(1,818)	$	8.96
Cancelled or forfeited	(155)	$	27.10
Outstanding at June 30, 2013	13,113	$	15.53	4.2	$	594,437
Vested and expected to vest in the future at June 30, 2013	12,698	$	14.63	4.1	$	586,995
Exercisable at June 30, 2013	10,039	$	9.04	3.0	$	519,980

Summary of 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, 2013	637	$	46.97
Granted 01/01/13 - 03/31/13	8	$	50.89
Granted 04/01/13 - 06/30/13	15	$	54.64
Vested	(46)	$	51.96
Forfeited/cancelled	(6)	$	60.11
Non-vested at June 30, 2013	608	$	46.69