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Transactions With Related Parties (Schedule Of Transactions With Related Parties) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Robertson Group [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses | $ 3,568 | [1] | $ 2,443 | [1],[2] |  |
Related party transaction, revenues | 20,888 | [1] | 3,740 | [1],[2] |  |
Davision [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, revenues | 1,207 | [1] | 1,081 | [1],[2] | 757 | [1]
Sandhill [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, revenues | 2,481 | [3] | 2,706 | [2],[3] | 2,867 | [3]
General Partners [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses |  |  | 47,035 | [2],[4] | 50,417 | [4]
Pipeline Transportation And Supply And Logistics Services [Member] | Denbury [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, revenues |  |  | 3,059 | [2] | 35,957 |
Supply and Logistics Products And Services [Member] | Denbury [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses |  |  | $ 373 | [2] | $ 7,229 |
Class A [Member] | Robertson Group [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Percentage of equity interest | 12.00% |  |  |  |  |
Class A [Member] | Davision [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Percentage of equity interest | 18.00% |  |  |  |  |
Class B [Member] | Robertson Group [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Percentage of equity interest | 74.00% |  |  |  |  |
Sandhill Group, LLC [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Percentage of equity interest | 50.00% |  |  |  |  |
[1] | The Robertson Group owned 12% of our Class A Units and 74% of our Class B Units at December 31, 2011. The Davison family owned 18% of our Class A Units at December 31, 2011.
[2] | Affiliates of Denbury Resources, Inc. sold its interests in our general partner in February 2010. Transactions with Denbury are included in the table as a related party through that date.
[3] | We own a 50% interest in Sandhill Group, LLC.
[4] | Our general partner became a wholly-owned subsidiary in December 2010.

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