Quarterly report pursuant to Section 13 or 15(d)

REVENUES - Performance Obligation (Details)

v3.19.3
REVENUES - Performance Obligation (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]    
Revenue, remaining performance obligation, amount $ 67.6  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01    
Revenue from Contract with Customer [Abstract]    
Revenue, remaining performance obligation, percentage 39.60%  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, remaining performance obligation, period   9 months
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 60.40%  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, remaining performance obligation, period