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Transactions with Related Parties (Narrative) (Details) (USD $) |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Nov. 30, 2010 | Dec. 31, 2011 Sandhill [Member] | Dec. 31, 2012 Sandhill [Member] | Dec. 31, 2011 Quintana Group [Member] | Dec. 31, 2010 Compensation Recognized For Executive Management Team [Member] | Jul. 29, 2010 DG Marine [Member] | Dec. 31, 2011 Sandhill Group, LLC [Member] | Dec. 31, 2012 Common Class B [Member] Davison [Member] | Oct. 05, 2012 Common Class B [Member] Davison [Member] | Dec. 31, 2012 Common Class B [Member] Quintana Group [Member] | Dec. 31, 2012 Common Class A [Member] Davison [Member] | Oct. 05, 2012 Common Class A [Member] Davison [Member] | Dec. 31, 2012 Common Class A [Member] Quintana Group [Member]
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interest |  |  |  |  |  |  |  |  |  |  | 50.00% | 76.90% | 76.90% | 74.00% | 17.00% | 17.20% | 12.00%
Percentage of equity interest acquired |  |  |  |  |  |  |  |  |  | 51.00% |  |  |  |  |  |  |
Due from related parties |  |  |  |  |  | $ 200,000 | $ 300,000 | $ 1,900,000 |  |  |  |  |  |  |  |  |
Due to related parties | 600,000 | 316,000 | 0 | [1] |  |  |  | 100,000 |  |  |  |  |  |  |  |  |
Percentage of obligation guaranteed |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Loan held by related party |  |  |  |  |  | 1,700,000 | 1,200,000 |  |  |  |  |  |  |  |  |  |
Guaranty obligation | 350,000,000 |  |  |  |  | 900,000 | 600,000 |  |  |  |  |  |  |  |  |  |
General partner made capital contributions |  |  | $ 2,500,000 |  | $ 2,500,000 |  |  |  | $ 76,900,000 |  |  |  |  |  |  |  |
[1] | 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.

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