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Derivative Instruments Balance Sheet Location (Details) $ in Thousands | Jun. 30, 2017 USD ($) bbl | Dec. 31, 2016 USD ($) bbl
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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.

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