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Derivative Instruments (Details) $ in Thousands | Dec. 31, 2018 USD ($) bbl | Dec. 31, 2017 USD ($) bbl
--- | --- | ---
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Cash collateral |  | $ 400 | $ 300
Derivatives not designated as hedging instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Assets |  | 186 | 0
Less: Counterparty netting and cash deficit (collateral) (assets) | [1] | (404) | 0
Total net fair value of derivatives, assets |  | 590 | 0
Liabilities |  | (2) | (1,087)
Less: Counterparty netting and cash deficit (collateral) (liabilities) | [1] | (2) | (290)
Total net fair value of derivative, liabilities |  | $ 0 | $ (797)
Open derivative contracts (barrels) | bbl |  | 82,000 | 370,000
Other current assets | Derivatives not designated as hedging instrument | Commodity derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Assets | [2] | $ 186 | $ 0
Liabilities | [2] | $ (2) | $ (1,087)
[1] | As of December 31, 2018 and 2017, we had cash collateral of $0.4 million and $0.3 million, respectively, netted with the net derivative position of our counterparty.
[2] | As of December 31, 2018 and 2017, we had open derivative contracts representing 82,000 barrels and 370,000 barrels, respectively, of refined petroleum products.

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