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REVENUES, Remaining Performance Obligation (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Revenue, Performance Obligation [Abstract]    
Contract assets $ 0 $ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01    
Revenue, Performance Obligation [Abstract]    
Expected timing of satisfaction, period 9 months  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01    
Revenue, Performance Obligation [Abstract]    
Expected timing of satisfaction, period 1 year