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DERIVATIVES (Fair Value of Derivative Instruments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Designated as Hedging Instrument [Member] | Inventory Intermediation Agreement Obligation [Member] | Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Fair Value Asset/(Liability) $ 24,069 $ (7,721)
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Fair Value Asset/(Liability)   $ (74,320)
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Accounts Receivable [Member]    
Derivatives, Fair Value [Line Items]    
Fair Value Asset/(Liability) $ 7,207