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Derivative Instruments - Balance Sheet Location (Details)
bbl in Thousands, $ in Thousands
Sep. 30, 2017
USD ($)
bbl
Dec. 31, 2016
USD ($)
bbl
Footnote [Abstract]    
Cash deficit $ (700) $ (600)
Derivatives not designated as hedging instrument [Member]    
Derivatives, Fair Value [Line Items]    
Assets 88 9
Liabilities 0 (82)
Less: Counterparty netting and cash collateral, assets [1] 88 9
Less: Counterparty netting and cash collateral, liabilities [1] 585 621
Total net fair value of derivative, assets 0 0
Total net fair value of derivative, liabilities $ (585) $ (703)
Footnote [Abstract]    
Derivative open contracts (in barrels) | bbl 96 93
Derivatives not designated as hedging instrument [Member] | OTC commodity swaps [Member] | Other current assets    
Derivatives, Fair Value [Line Items]    
Assets [2] $ 88 $ 9
Liabilities [2] $ 0 $ (82)
[1] As of September 30, 2017 and December 31, 2016, we had a cash deficit of $0.7 million and $0.6 million, respectively, netted with the net derivative position of our counterparty.
[2] As of September 30, 2017 and December 31, 2016, we had open derivative contracts representing 96,000 barrels and 93,000 barrels, respectively, of refined petroleum products.