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Acquisitions (Schedule Of Pro Forma Financial Information) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Pro forma earnings data: |  |  |
Equity in earnings of equity investees |  |  | $ 15,322
Net income |  |  | (55,001)
Basic and diluted earnings per unit: |  |  |
Basic and Diluted | $ 1.23 | $ 0.75 | $ 0.49
Pro forma net income per unit |  |  | $ 0.30
As reported units outstanding | 78,363 | 67,938 | 40,560
Pro forma units outstanding |  |  | 44,969
Gulf Of Mexico Crude Oil Pipeline Systems [Member] |  |  |
Pro forma earnings data: |  |  |
Revenues |  | 3,096,693 |
Equity in earnings of equity investees |  | 14,770 |
Net income |  | $ 58,349 |
Basic and diluted earnings per unit: |  |  |
Basic and Diluted |  | $ 0.75 |
Pro forma net income per unit |  | $ 0.86 |
As reported units outstanding |  | 67,938 |
Pro forma units outstanding |  | 67,938 |

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