EQUITY-BASED COMPENSATION - Director Stock Awards (Details) - Directors - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Equity-based compensation
Grant of stock (in shares)	28,426	32,180
Common stock issued for director fees	4,663	7,618
Common Stock
Equity-based compensation
Grant of stock (in shares)	28,426	32,180
Common stock issued for director fees	4,663	7,618