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REVENUES - Performance Obligation (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]    
Revenue, remaining performance obligation, amount $ 70.5  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01    
Revenue from Contract with Customer [Abstract]    
Revenue, remaining performance obligation, percentage 68.10%  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, remaining performance obligation, period   1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01    
Revenue from Contract with Customer [Abstract]    
Revenue, remaining performance obligation, percentage 31.90%  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, remaining performance obligation, period