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Commitments and Contingencies Crude Oil Releases (Details) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Apr. 28, 2015 bbl | Apr. 30, 2014 bbl | Oct. 31, 2013 bbl | Mar. 31, 2013 bbl
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Environmental Remediation Expense |  | $ 1.0 | $ 0.6 |  |  |  |
Haynesville Crude Oil Release [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Barrels of crude oil released | bbl |  |  |  |  | 400 |  |
Accrual for Environmental Loss Contingencies | $ 0.2 |  |  |  |  |  |
Environmental Remediation Expense |  | 1.0 | $ 0.3 |  |  |  |
Maximum Exposure for Environmental Remediation under Omnibus Agreement | 1.0 |  |  |  |  |  |
Magnolia Station Spill [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Barrels of crude oil released | bbl |  |  |  |  |  |  | 5,900
Accrual for Environmental Loss Contingencies | 1.0 |  |  |  |  |  |
Maximum Exposure for Environmental Remediation under Omnibus Agreement | 0.3 |  |  |  |  |  |
Fouke Junction Crude Oil Release [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Barrels of crude oil released | bbl |  |  |  | 130 |  |  |
Accrual for Environmental Loss Contingencies | 0.1 |  |  |  |  |  |
Macedonia Crude Oil Release [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Barrels of crude oil released | bbl |  |  |  |  |  | 50 |
Maximum Exposure for Environmental Remediation under Omnibus Agreement | 0.3 |  |  |  |  |  |
Operating Expense [Member] | Macedonia Crude Oil Release [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Cost incurred for environmental remediation | $ 0.0 | $ 0.3 |  |  |  |  |

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