STOCK-BASED COMPENSATION (Details 2) - Stock options - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Weighted-average assumptions used to estimate the fair value of options granted
Dividend yield (as a percent)	0.00%		0.00%	0.00%	0.00%
Expected volatility (as a percent)	37.00%		37.40%	37.10%	42.40%
Risk-free interest rate (as a percent)	1.50%		1.60%	1.60%	1.60%
Expected term	5 years 9 months 18 days		5 years 7 months 6 days	5 years 9 months 18 days	5 years 10 months 24 days
Stock Options, Number of Shares
Balance at the beginning of the period (in shares)		13,066		13,066
Granted (in shares)	33	903
Exercised (in shares)				(7,052)
Cancelled or forfeited (in shares)				(60)
Balance at the end of the period (in shares)	6,890			6,890		13,066
Vested and expected to vest in the future at the end of the period (in shares)	6,446			6,446
Exercisable at the end of the period (in shares)	4,052			4,052
Stock options, Weighted-Average Exercise Price Per Share
Balance at the beginning of the period (in dollars per share)		$ 19.73		$ 19.73
Granted (in dollars per share)	$ 133.43	$ 133.68
Exercised (in dollars per share)				5.93
Cancelled or forfeited (in dollars per share)				57.50
Balance at the end of the period (in dollars per share)	49.01			49.01		$ 19.73
Vested and expected to vest in the future at the end of the period (in dollars per share)	45.78			45.78
Exercisable at the end of the period (in dollars per share)	$ 23.45			$ 23.45
Weighted-Average Remaining Contractual Term
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2				6 years		3 years 1 month 6 days
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2				6 years		3 years 1 month 6 days
Vested and expected to vest in the future at the end of the period				5 years 9 months 18 days
Exercisable at the end of the period				4 years 2 months 12 days
Aggregate Intrinsic Value
Balance at the beginning of the period		$ 1,158,412		$ 1,158,412
Balance at the end of the period	$ 586,962			586,962		$ 1,158,412
Vested and expected to vest in the future at the end of the period	569,888			569,888
Exercisable at the end of the period	$ 448,009			$ 448,009