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Derivative Instruments (Details) bbl in Thousands, $ in Thousands | Dec. 31, 2017 USD ($) bbl | Dec. 31, 2016 USD ($) bbl
--- | --- | ---
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Less: Counterparty netting and cash collateral, Liabilities |  | $ (290) | $ 630
Derivatives not designated as hedging instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Assets |  | 0 | 9
Less: Counterparty netting and cash collateral, Assets | [1] | 0 | 9
Total net fair value of derivative, Assets |  | 0 | 0
Liabilities |  | (1,087) | (82)
Less: Counterparty netting and cash collateral, Liabilities | [1] | (290) | 621
Total net fair value of derivative, Liabilities |  | $ (797) | $ (703)
Open derivative contracts (barrels) | bbl |  | 370 | 93
Other current assets | Derivatives not designated as hedging instrument | OTC commodity swaps |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Assets | [2] | $ 0 | $ 9
Liabilities | [2] | $ (1,087) | $ (82)
[1] | As of December 31, 2017 and 2016, we had cash collateral of $0.3 million and a cash deficit of $0.6 million, respectively, netted with the net derivative position of our counterparty.
[2] | As of December 31, 2017 and 2016, we had open derivative contracts representing 370,000 barrels and 93,000 barrels, respectively, of refined petroleum products.

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