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Derivative Instruments (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
bbl
Dec. 31, 2015
USD ($)
bbl
Footnote [Abstract]    
Cash deficit $ 600  
Cash collateral   $ 800
Derivatives not designated as hedging instrument [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Assets 9 171
Liabilities (82) (45)
Less: Counterparty netting and cash collateral, Assets [1] 9 (706)
Less: Counterparty netting and cash collateral, Liabilities [1] 621 (45)
Total net fair value of derivative, Assets 0 877
Total net fair value of derivative, Liabilities $ (703) $ 0
Footnote [Abstract]    
Open derivative contracts (barrels) | bbl 93,000 171,000
Other current assets | Derivatives not designated as hedging instrument [Member] | OTC commodity swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Assets [2] $ 9 $ 171
Liabilities [2] $ (82) $ (45)
[1] As of December 31, 2016, we had a cash deficit of $0.6 million netted with the net derivative positions of one of our counterparties. As of December 31, 2015, $0.8 million cash collateral was held by counterparty brokerage firms.
[2] As of December 31, 2016 and 2015, we had open derivative contracts representing 93,000 barrels and 171,000 barrels, respectively, of refined petroleum products.