EARNINGS PER SHARE - Components of Numerator and Denominator for Computation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Net income (loss) attributable to common shareholders - Basic	$ 1,642	$ (2,010)
Interest on Convertible Notes	0	694
Gain on derivative liability	0	(1,581)
Net income (loss) attributable to common shareholders - Diluted	$ 1,642	$ (2,897)
Denominator:
Weighted average common shares - Basic (shares)	35,803,000	32,872,000
Effective of diluted shares:
Share-based awards (shares)	284,000	674,000
Convertible Notes (shares)	0	2,934,271
Weighted average common shares - Diluted (shares)	36,087,000	36,480,000
Net income (loss) per share attributable to common shareholders - Basic (in dollars per share)	$ 0.05	$ (0.06)
Net income (loss) per share attributable to common shareholders - Diluted (in dollars per share)	$ 0.05	$ (0.08)