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INCOME TAXES (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Effective income tax rate (as a percent) 24.00% 61.50% 49.00% 110.20%   (18.00%)
Unrecognized tax benefits            
Net uncertain tax benefit positions that would increase (reduce) effective income tax rate, if recognized $ 0   $ 0     $ 52
Forecast            
Effective income tax rate (as a percent)         51.00%