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INCOME TAXES (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
INCOME TAXES [Abstract]          
Income tax expense $ 0 $ 0 $ 0 $ 0  
Income tax, interest and penalites     $ 0   $ 0