EQUITY - Summary of Stockholder Share Activity (Details)	9 Months Ended
	Sep. 30, 2018 shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares outstanding as of December 31, 2017	48,497,942
Shares issued under stock incentive plan, net of awards surrendered to pay applicable taxes	194,641
Shares issued to Board of Directors in lieu of cash	2,370
Shares outstanding at September 30, 2018	48,694,953