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INCOME TAXES (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2018
Income Tax Contingency [Line Items]      
Income tax expense $ 5,684 $ 342  
Effective tax rate, percent 54.90% 21.60%  
Tax Cuts and Jobs Act of 2017, change in tax rate, income tax expense (benefit) $ 3,600    
Forecast      
Income Tax Contingency [Line Items]      
Federal statutory prorated rate, percent     24.53%