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DERIVATIVES (Narrative) (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
bbl
Dec. 31, 2017
USD ($)
bbl
Dec. 31, 2016
USD ($)
Derivative [Line Items]      
Gain (loss) on fair value hedge ineffectiveness $ 0 $ 0 $ 0
Crude Oil Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Derivative, notional amount, volume | bbl 5,801,000 22,348,000  
Refined Product Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Derivative, notional amount, volume | bbl 1,609,000 1,989,000  
Accrued Expenses [Member] | Inventory Intermediation Agreement Obligation [Member] | Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Fair Value Asset/(Liability) $ 24,069,000 $ (7,721,000)  
Accrued Expenses [Member] | Commodity contract [Member] | Not Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Fair Value Asset/(Liability)   $ (74,320,000)  
Accounts Receivable [Member] | Commodity contract [Member] | Not Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Fair Value Asset/(Liability) $ 7,207,000