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Derivative Instruments (Details)
bbl in Thousands, $ in Thousands
Dec. 31, 2017
USD ($)
bbl
Dec. 31, 2016
USD ($)
bbl
Derivative Instruments, Gain (Loss) [Line Items]    
Less: Counterparty netting and cash collateral, Liabilities $ (290) $ 630
Derivatives not designated as hedging instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Assets 0 9
Less: Counterparty netting and cash collateral, Assets [1] 0 9
Total net fair value of derivative, Assets 0 0
Liabilities (1,087) (82)
Less: Counterparty netting and cash collateral, Liabilities [1] (290) 621
Total net fair value of derivative, Liabilities $ (797) $ (703)
Open derivative contracts (barrels) | bbl 370 93
Other current assets | Derivatives not designated as hedging instrument | OTC commodity swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Assets [2] $ 0 $ 9
Liabilities [2] $ (1,087) $ (82)
[1] As of December 31, 2017 and 2016, we had cash collateral of $0.3 million and a cash deficit of $0.6 million, respectively, netted with the net derivative position of our counterparty.
[2] As of December 31, 2017 and 2016, we had open derivative contracts representing 370,000 barrels and 93,000 barrels, respectively, of refined petroleum products.