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Transactions With Related Parties (Schedule Of Transactions With Related Parties) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2012 | Mar. 31, 2011
Robertson Group [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses | $ 1,957 | [1] | $ 1,040 | [1]
Related party transaction, revenues | 10,188 | [1] | 9,721 | [1]
Sandhill Group, LLC [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, revenues | 613 | [2] | 543 | [2]
Davison [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, revenues | 312 | [1] | 242 | [1]
Chief Executive Officer [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses | $ 150 |  |  |
Genesis Energy Interest In Sandhill Group, LLC [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage of interest held | 50.00% |  |  |
Class A [Member] | Robertson Group [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage of common units owned by affiliated companies | 9.00% |  |  |
Class A [Member] | Davison [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage of common units owned by affiliated companies | 16.00% |  |  |
Class B [Member] | Robertson Group [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage of common units owned by affiliated companies | 74.00% |  |  |
[1] | The Robertson Group owned 9% of our Class A common units and 74% of our Class B common units at March 31, 2012. The Davison family owned 16% of our Class A common units at March 31, 2012.
[2] | We own a 50% interest in Sandhill Group, LLC.

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