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Derivative Instruments (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
bbl
Dec. 31, 2017
USD ($)
bbl
Derivative Instruments, Gain (Loss) [Line Items]    
Cash collateral $ 400 $ 300
Derivatives not designated as hedging instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Assets 186 0
Less: Counterparty netting and cash deficit (collateral) (assets) [1] (404) 0
Total net fair value of derivatives, assets 590 0
Liabilities (2) (1,087)
Less: Counterparty netting and cash deficit (collateral) (liabilities) [1] (2) (290)
Total net fair value of derivative, liabilities $ 0 $ (797)
Open derivative contracts (barrels) | bbl 82,000 370,000
Other current assets | Derivatives not designated as hedging instrument | Commodity derivatives    
Derivative Instruments, Gain (Loss) [Line Items]    
Assets [2] $ 186 $ 0
Liabilities [2] $ (2) $ (1,087)
[1] As of December 31, 2018 and 2017, we had cash collateral of $0.4 million and $0.3 million, respectively, netted with the net derivative position of our counterparty.
[2] As of December 31, 2018 and 2017, we had open derivative contracts representing 82,000 barrels and 370,000 barrels, respectively, of refined petroleum products.