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INTANGIBLE ASSETS - Narrative (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
Finite-Lived Intangible Assets [Line Items]  
Amortization expense, 2017 $ 3,300,000
Amortization expense, 2018 2,430,000
Amortization expense, 2019 80,000
Amortization expense, 2020 0
Sales Contracts  
Finite-Lived Intangible Assets [Line Items]  
Residual value $ 0
Weighted average expected economic life 11 months 9 days