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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net (loss) income attributable to common shareholders - Basic	$ (441)	$ 6,723	$ 2,740	$ 9,563
Interest on Convertible Notes	0	0	0	695
Gain on derivative liability	0	0	0	(1,581)
Net (loss) income attributable to common shareholders - Diluted	$ (441)	$ 6,723	$ 2,740	$ 8,677
Denominator:
Weighted average common shares - Basic (shares)	35,594,000	35,748,000	35,682,000	34,768,000
Effective of diluted shares:
Share-based awards (shares)	0	288,000	199,000	444,000
Convertible Notes (shares)	0	0	0	967,342
Weighted average common shares - Diluted (shares)	35,594,000	36,036,000	35,881,000	36,179,000
Net (loss) income per share attributable to common shareholders - Basic (in dollars per share)	$ (0.01)	$ 0.19	$ 0.08	$ 0.28
Net (loss) income per share attributable to common shareholders - Diluted (in dollars per share)	$ (0.01)	$ 0.19	$ 0.08	$ 0.24