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Derivative Instruments Balance Sheet Location (Details)
$ in Thousands
Jun. 30, 2017
USD ($)
bbl
Dec. 31, 2016
USD ($)
bbl
Footnote [Abstract]    
Cash collateral $ 800  
Cash deficit   $ 600
Derivatives not designated as hedging instrument [Member]    
Derivatives, Fair Value [Line Items]    
Assets 11 9
Liabilities (257) (82)
Counterparty Netting and Cash Collateral, Assets [1] (591) 9
Counterparty Netting and Cash Collateral, Liabilities [1] (257) 621
Total net fair value of derivative, assets 602 0
Total net fair value of derivative, liabilities $ 0 $ (703)
Footnote [Abstract]    
Derivative open contracts (barrels) | bbl 91,000 93,000
Derivatives not designated as hedging instrument [Member] | OTC commodity swaps | Other current assets    
Derivatives, Fair Value [Line Items]    
Assets [2] $ 11 $ 9
Liabilities [2] $ (257) $ (82)
[1] As of June 30, 2017, $0.8 million of cash collateral was held by a counterparty brokerage firm and has been netted with the net derivative position of our counterparty. As of December 31, 2016, we had a cash deficit of $0.6 million netted with the net derivative position of our counterparty.
[2] As of June 30, 2017 and December 31, 2016, we had open derivative contracts representing 91,000 barrels and 93,000 barrels, respectively, of refined petroleum products.