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Derivative Instruments - Balance Sheet Location (Details) $ in Thousands | Mar. 31, 2018 USD ($) bbl | Dec. 31, 2017 USD ($) bbl
--- | --- | ---
Footnote [Abstract] |  |
Cash deficit | $ 200 |
Cash collateral |  | $ 300
Derivatives not designated as hedging instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Assets | 13 | 0
Liabilities | (167) | (1,087)
Less: Counterparty netting and cash collateral | (209) | 290
Less: Counterparty netting and cash collateral | (13) | 0
Total net fair value of derivative, assets | 0 | 0
Total net fair value of derivative, liabilities | $ (376) | $ (797)
Footnote [Abstract] |  |
Derivative open contracts (in barrels) | bbl | 189,000 | 370,000
Derivatives not designated as hedging instrument [Member] | Commodity derivatives | Accrued expenses and other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Assets | $ 13 | $ 0
Liabilities | $ (167) | $ (1,087)

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