FAIR VALUE (Reconciliation of Warrants Using Level 3 Inputs) (Details) - USD ($)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Reconciliation of the beginning and ending balances of the fair value measurements using significant unobservable inputs (Level 3)
Exercises of Sponsor and Management Warrants		$ 375,613,000
Significant Unobservable Inputs (Level 3)
Reconciliation of the beginning and ending balances of the fair value measurements using significant unobservable inputs (Level 3)
Marketability discount due to lapses of restriction period	$ 0
Warrant | Significant Unobservable Inputs (Level 3)
Reconciliation of the beginning and ending balances of the fair value measurements using significant unobservable inputs (Level 3)
Balance at the beginning of the period	0	332,170,000
Warrant liability loss	0	43,443,000
Exercises of Sponsor and Management Warrants	0	(375,613,000)
Balance at the end of the period	$ 0	$ 0