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Commitments and Contingencies Crude Oil Releases (Details) $ in Millions | Dec. 31, 2016 USD ($) | Jan. 31, 2016 bbl | Apr. 28, 2015 bbl | Apr. 30, 2014 bbl | Mar. 31, 2013 bbl
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Haynesville Crude Oil Release [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Barrels of crude oil released |  |  |  | 400 |
Magnolia Station Spill [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Barrels of crude oil released |  |  |  |  | 5,900
Accrual for Environmental Loss Contingencies | $ | $ 1.0 |  |  |  |
Fouke Junction Crude Oil Release [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Barrels of crude oil released |  |  | 130 |  |
Modisette Release [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Barrels of crude oil released |  | 30 |  |  |
Paline Release [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Barrels of crude oil released |  | 350 |  |  |
Accrual for Environmental Loss Contingencies | $ | $ 0.1 |  |  |  |

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