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Subsequent Events (Details) (USD $) | Dec. 31, 2011 | Dec. 31, 2010 | Jul. 31, 2010 DG Marine [Member] | Dec. 31, 2011 Poseidon Oil Pipeline Company, L.L.C. [Member] Mi | Dec. 31, 2011 Odyssey Pipeline L.L.C. [Member] Mi | Dec. 31, 2011 Eugene Island Pipeline System [Member] In Mi | Feb. 01, 2012 Senior Unsecured Notes [Member] | Dec. 31, 2011 Senior Unsecured Notes [Member] | Dec. 31, 2011 Maximum [Member] Poseidon Oil Pipeline Company, L.L.C. [Member] In | Dec. 31, 2011 Maximum [Member] Odyssey Pipeline L.L.C. [Member] In | Dec. 31, 2011 Minimum [Member] Poseidon Oil Pipeline Company, L.L.C. [Member] In | Dec. 31, 2011 Minimum [Member] Odyssey Pipeline L.L.C. [Member] In | Dec. 31, 2011 Gulf Of Mexico Crude Oil Pipelines [Member]
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Pipeline diameter, in inches |  |  |  |  |  | 20 |  |  | 24 | 20 | 16 | 12 |
Pipeline length, in miles |  |  |  | 367 | 120 | 183 |  |  |  |  |  |  |
Ownership percentage |  |  | 49.00% | 28.00% | 29.00% | 23.00% |  |  |  |  |  |  |
Purchase price of acquired entity |  |  |  |  |  |  |  |  |  |  |  |  | $ 205,900,000
Crude oil line fill included in purchase price | 26,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Pipeline capacity, barrels per day |  | 500,000 |  | 400,000 | 300,000 | 200,000 |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |
Debt instrument, stated rate |  |  |  |  |  |  |  | 7.875% |  |  |  |  |
Debt instrument, effective interest rate |  |  |  |  |  |  |  | 7.682% |  |  |  |  |
Debt instrument, percentage of face value |  |  |  |  |  |  | 101.00% |  |  |  |  |  |

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