EQUITY BASED COMPENSATION - Equity Options Changed During Period (Details) - Equity options	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Equity Options
Beginning balance (in shares) | shares	620,721
Granted (in shares) | shares	455,126
Forfeited | shares	(113,411)
Ending balance (in shares) | shares	962,436
Ending balance, exercisable | shares	412,542
Weighted-average Exercise Price
Beginning balance (in dollars per share) | $ / shares	$ 16.50
Granted (in dollars per share) | $ / shares	20.00
Forfeited (in dollars per share) | $ / shares	19.48
Ending balance (in dollars per share) | $ / shares	17.80
Ending balance, exercisable | $ / shares	$ 14.49