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Commitments and Contingencies - Crude Oil Releases (Details) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) | Feb. 28, 2018 bbl | Mar. 31, 2013 bbl
Loss Contingencies [Line Items] |  |  |
Accrual for environmental loss contingencies, period increase (decrease) | $ 0.1 |  |
Accrual for environmental loss contingencies, expected reimbursements | 6.1 |  |
SALA Gathering System February 2018 Release - First |  |  |
Loss Contingencies [Line Items] |  |  |
Crude oil released (in barrels) | bbl |  | 203 |
Magnolia Release |  |  |
Loss Contingencies [Line Items] |  |  |
Crude oil released (in barrels) | bbl |  |  | 5,900
Magnolia Release | Other Current Liabilities [Member] | Magnolia Release |  |  |
Loss Contingencies [Line Items] |  |  |
Accrual for environmental loss contingencies | $ 1.0 |  |

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