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Commitments and Contingencies Crude Oil Releases (Details) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($) | Jan. 31, 2016 bbl | Mar. 31, 2013 bbl
Modisette Release [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Remediation costs incurred | $ 0.3 |  |  |
Crude oil released (barrels) | bbl |  |  | 30 |
Paline Release [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Remediation costs incurred | 0.6 |  |  |
Accrual for Environmental Loss Contingencies | 0.2 |  |  |
Crude oil released (barrels) | bbl |  |  | 350 |
Magnolia Station Spill [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Accrual for Environmental Loss Contingencies | 1.0 |  |  |
Crude oil released (barrels) | bbl |  |  |  | 5,900
Operating Expense [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Remediation costs incurred | $ 0.9 | $ 0.1 |  |

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