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Derivative Instruments - Balance Sheet Location (Details) $ in Thousands | Jun. 30, 2018 USD ($) bbl | Dec. 31, 2017 USD ($) bbl
--- | --- | ---
Footnote [Abstract] |  |  |
Cash deficit |  | $ 500 |
Cash collateral |  |  | $ 300
Derivatives not designated as hedging instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Assets |  | 2 | 0
Liabilities |  | (380) | (1,087)
Less: Counterparty netting and cash collateral (deficit), assets | [1] | (88) | 0
Less: Counterparty netting and cash collateral (deficit), liabilities | [1] | (380) | (290)
Total net fair value of derivative, assets |  | 90 | 0
Total net fair value of derivative, liabilities |  | $ 0 | $ (797)
Footnote [Abstract] |  |  |
Derivative open contracts (in barrels) | bbl |  | 117,000 | 370,000
Derivatives not designated as hedging instrument [Member] | Commodity derivatives | Accrued expenses and other current liabilities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Assets | [2] | $ 2 | $ 0
Liabilities | [2] | $ (380) | $ (1,087)
[1] | As of June 30, 2018 and December 31, 2017, we had cash collateral of $0.5 million and $0.3 million, respectively, netted with the net derivative position of our counterparty.
[2] | As of June 30, 2018 and December 31, 2017, we had open derivative contracts representing 117,000 barrels and 370,000 barrels, respectively, of refined petroleum products.

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