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Transactions With Related Parties (Narrative) (Details) (USD $) In Millions, unless otherwise specified |  |  |  |  |  |  |  |  | 12 Months Ended |  |
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Dec. 31, 2011 | Dec. 31, 2010 | Nov. 30, 2010 | Dec. 31, 2009 | Dec. 31, 2010 Compensation Recognized For Executive Management Team [Member] | Dec. 31, 2009 Compensation Recognized For Executive Management Team [Member] | Dec. 31, 2011 Robertson Group [Member] | Dec. 31, 2010 Robertson Group [Member] | Dec. 31, 2011 Sandhill [Member] | Dec. 31, 2010 Sandhill [Member] | Jul. 29, 2010 DG Marine [Member]
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interest acquired |  |  |  |  |  |  |  |  |  |  | 51.00%
Due from related parties |  |  |  |  |  |  | $ 1.9 | $ 1.4 | $ 0.2 | $ 0.2 |
Due to related parties | 0.3 |  |  |  |  |  | 0.1 | 0.2 |  |  |
Loan held by related party |  |  |  |  |  |  |  |  | 1.7 | 2.2 |
Percentage of obligation guaranteed |  |  |  |  |  |  |  |  | 50.00% |  |
Guaranty obligation |  |  |  |  |  |  |  |  | 0.9 | 1.1 |
General partner made capital contributions |  | $ 2.5 | $ 2.5 | $ 0.1 | $ 76.9 | $ 14.1 |  |  |  |  |

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