SHARE-BASED COMPENSATION (Details) - Plan Name [Domain] - Stock options - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Number of Options
Outstanding at beginning of period (in shares)		7,217,331
Granted (in shares)	885,543	885,543
Repurchased (in shares)		(1,641,387)
Exercised (in shares)		(1,043,830)
Expired/cancelled (in shares)		(641,392)
Outstanding at end of period (in shares)	4,776,265	4,776,265	7,217,331
Exercisable at end of period (in shares)	1,421,806	1,421,806
Weighted Average Exercise Price
Outstanding at beginning of period (in dollars per share)		$ 7.54
Granted (in dollars per share)		40.66
Repurchased (in dollars per share)		5.44
Exercised (in dollars per share)		5.63
Expired/cancelled (in dollars per share)		16.44
Outstanding at end of period (in dollars per share)	$ 13.63	13.63	$ 7.54
Exercisable at end of period (in dollars per share)	$ 4.19	$ 4.19
Weighted Average Remaining Contractual Life
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2		7 years 9 months 18 days	6 years 10 months 24 days
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2		7 years 9 months 18 days	6 years 10 months 24 days
Exercisable at end of period		5 years 9 months 18 days
Aggregate Intrinsic Value
Outstanding at beginning of period		$ 142,262
Outstanding at end of period	$ 149,207	149,207	$ 142,262
Exercisable at end of period	$ 57,836	$ 57,836