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DERIVATIVE INSTRUMENTS - Unobservable Inputs Narrative (Details) - Level 3
9 Months Ended
Sep. 30, 2018
Minimum  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Percentage of exit price premiums related to derivative contracts 1.00%
Maximum  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Percentage of exit price premiums related to derivative contracts 16.00%