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INTANGIBLE ASSETS - Narrative (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
Finite-Lived Intangible Assets [Line Items]  
Amortization expense, 2017 $ 2,500,000
Sales Contracts  
Finite-Lived Intangible Assets [Line Items]  
Residual value $ 0
Weighted average expected economic life 3 months 1 day