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Partners' Capital And Distributions (Narrative) (Details) (USD $) | 0 Months Ended | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 28, 2010 | Jul. 31, 2011 | Nov. 30, 2010 | Dec. 31, 2011 days | Dec. 31, 2010 days | Dec. 31, 2009 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
General Partners' interest percentage | 2.00% |  |  |  |  |  |  |  |  |  |  |
Limited Partners' ownership percentage | 98.00% |  |  | 100.00% |  |  |  |  |  |  |  |
Number of common units issued |  |  |  | 71,965,000 | 64,615,000 |  |  |  |  |  |  |
Proceeds received from offering, net of costs |  | $ 184,969,000 | $ 118,837,000 |  |  |  |  |  |  |  |  |
Common units, outstanding |  |  |  | 71,965,000 | 64,615,000 |  |  |  |  |  |  |
Partners' Capital Account, Distribution Per Unit of Limited Partner Interest |  |  |  | $ 0.4400 | $ 0.4000 | $ 0.3600 | $ 0.4275 | $ 0.4150 | $ 0.4075 | $ 0.3875 | $ 0.3750 | $ 0.3675
Distribution paid per common unit |  |  |  | $ 0.4400 | $ 0.4000 | $ 0.3600 | $ 0.4275 | $ 0.4150 | $ 0.4075 | $ 0.3875 | $ 0.3750 | $ 0.3675
Cash or stock available for distributions, percent usually distributed |  |  |  | 100.00% | 100.00% |  |  |  |  |  |  |
Days to distribute |  |  |  | 45 | 45 |  |  |  |  |  |  |
Price per share of common units issued |  | $ 26.30 | $ 23.58 |  |  |  |  |  |  |  |  |
Issuance of common units for cash, net |  |  |  | 184,969,000 | 116,347,000 |  |  |  |  |  |  |
Contribution of capital |  |  | 2,500,000 |  | 2,500,000 | 100,000 |  |  |  |  |  |
Capital account percentage |  |  | 2.00% |  |  |  |  |  |  |  |  |
Non-cash contributions |  |  |  |  | 76,900,000 | 14,100,000 |  |  |  |  |  |
Noncash compensation charge |  |  |  |  | 76,923,000 | 14,104,000 |  |  |  |  |  |
Waiver Units Class 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Waiver units authorized |  |  |  | 1,750,000 |  |  |  |  |  |  |  |
Waiver Units Class 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Waiver units authorized |  |  |  | 1,750,000 |  |  |  |  |  |  |  |
Waiver Units Class 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Waiver units authorized |  |  |  | 1,750,000 |  |  |  |  |  |  |  |
Waiver Units Class 4 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Waiver units authorized |  |  |  | 1,750,000 |  |  |  |  |  |  |  |
General Partner Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
General Partners' interest percentage | 2.00% |  |  |  |  |  |  |  |  |  |  |
Genesis Crude Oil, L.P. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
General Partners' interest percentage | 0.01% |  |  |  |  |  |  |  |  |  |  |
Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common units, outstanding |  |  |  | 71,925,065 |  |  |  |  |  |  |  |
Class B [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common units, outstanding |  |  |  | 39,997 |  |  |  |  |  |  |  |
Waiver Units [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Distribution Per Unit of Limited Partner Interest |  |  |  | $ 0.44 |  |  |  |  |  |  |  |
Distribution paid per common unit |  |  |  | $ 0.44 |  |  |  |  |  |  |  |
Waiver units authorized | 7,000,000 |  |  | 6,949,004 |  |  |  |  |  |  |  |
Class One [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion feature threshold, quarterly distribution, minimum, per unit |  |  |  | $ 0.43 |  |  |  |  |  |  |  |
Conversion feature, minimum distribution coverage ratio |  |  |  | 1.1 |  |  |  |  |  |  |  |
Class Two [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion feature threshold, quarterly distribution, minimum, per unit |  |  |  | $ 0.46 |  |  |  |  |  |  |  |
Conversion feature, minimum distribution coverage ratio |  |  |  | 1.1 |  |  |  |  |  |  |  |
Class Three [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion feature threshold, quarterly distribution, minimum, per unit |  |  |  | $ 0.49 |  |  |  |  |  |  |  |
Conversion feature, minimum distribution coverage ratio |  |  |  | 1.1 |  |  |  |  |  |  |  |
Class Four [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion feature threshold, quarterly distribution, minimum, per unit |  |  |  | $ 0.52 |  |  |  |  |  |  |  |
Conversion feature, minimum distribution coverage ratio |  |  |  | 1.1 |  |  |  |  |  |  |  |
Cameron Highway Oil Pipeline Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of common units issued |  |  | 5,175,000 |  |  |  |  |  |  |  |  |
Percentage of equity interest |  |  | 50.00% |  |  |  |  |  |  |  |  |
General Partners [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of common units issued | 27,000,000 |  |  |  |  |  |  |  |  |  |  |
General Partners [Member] | Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of common units issued | 19,960,000 |  |  |  |  |  |  |  |  |  |  |
General Partners [Member] | Class B [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of common units issued | 40,000 |  |  |  |  |  |  |  |  |  |  |
FMT Black Oil Barge Transportation Business [Member] | Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of common units issued |  | 7,350,000 |  |  |  |  |  |  |  |  |  |
Proceeds received from offering, net of costs |  | $ 185,000,000 |  |  |  |  |  |  |  |  |  |

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