SHARE BASED COMPENSATION - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Weighted Average Exercise Price Per Share:
Beginning balance, weighted average exercise price per share (in dollars per share		$ 19.48
Granted, weighted average exercise price per share (in dollars per share)		18.34
Forfeited, weighted average exercise price per share (in dollars per share		20.94
Ending balance, weighted average exercise price per share (in dollars per share	$ 19.10	19.10	$ 19.48
Options exercisable, weighted average exercise price per share (in dollars per share)	$ 0.00	$ 0.00
Weighted Average Remaining Contractual Term (in years)		9 years 3 months 20 days	9 years 11 months 19 days
Aggregate Intrinsic Value	$ (14,202)	$ (14,202)	$ 8,944
Carry Unit Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee and Non-employee Share-based Compensation Expense	7,993	25,494
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee and Non-employee Share-based Compensation Expense	$ 4,233	$ 8,355
Time Vesting
Shares Under Option (in shares):
Outstanding balance, beginning of period (in shares)		5,110,747
Granted (in shares)		1,943,676
Forfeited (in shares)		(179,705)
Outstanding balance, end of period (in shares)	6,874,718	6,874,718	5,110,747
Options exercisable (in shares)	0	0
Performance Based Vesting
Shares Under Option (in shares):
Outstanding balance, beginning of period (in shares)		0
Granted (in shares)		95,953
Forfeited (in shares)		(22,314)
Outstanding balance, end of period (in shares)	73,639	73,639	0
Options exercisable (in shares)	0	0