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REVENUES FROM CONTRACTS WITH CUSTOMERS - Narrative, Revenue Remaining Performance Obligation (Details)
$ in Millions
Jun. 30, 2018
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Performance obligations expected to be satisfied $ 2.3
Performance obligations expected to be satisfied, expected timing 6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Performance obligations expected to be satisfied $ 2.6
Performance obligations expected to be satisfied, expected timing 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Performance obligations expected to be satisfied $ 1.9
Performance obligations expected to be satisfied, expected timing 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Performance obligations expected to be satisfied $ 1.0
Performance obligations expected to be satisfied, expected timing 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Performance obligations expected to be satisfied $ 0.7
Performance obligations expected to be satisfied, expected timing 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Performance obligations expected to be satisfied $ 2.5
Performance obligations expected to be satisfied, expected timing