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DERIVATIVES (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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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 |

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