INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
INCOME TAXES [Abstract]
Provision for income taxes	$ 50	$ 50
Effective income tax rate	0.70%	0.50%
Federal corporate tax rate	21.00%
Provisional deferred tax expense (benefit)			$ (17,700)