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REVENUE RECOGNITION - CONTRACTED REVENUE (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]    
Revenue, remaining performance obligation $ 33.3 $ 34.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-03-31    
Revenue from Contract with Customer [Abstract]    
Revenue, remaining performance obligation $ 13.5  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-03-31    
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]: 2021-03-31    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, remaining performance obligation, period 2 years  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-03-31    
Revenue from Contract with Customer [Abstract]    
Revenue, remaining performance obligation $ 19.8  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, remaining performance obligation, period