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Partners' Capital and Distributions (Narrative) (Details) (USD $)
 0 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended
Dec. 28, 2010
Mar. 31, 2012
Jul. 31, 2011
Nov. 30, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Sep. 30, 2012
Jun. 30, 2012
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Waiver Units Class1 [Member]
Dec. 31, 2012
Waiver Units Class 2 [Member]
Dec. 31, 2012
Waiver Units Class 3 [Member]
Dec. 31, 2012
Waiver Units Class4 [Member]
Dec. 28, 2010
Genesis Crude Oil, L.P. [Member]
Mar. 28, 2012
Class A [Member]
Dec. 31, 2012
Class A [Member]
Feb. 01, 2012
Class A [Member]
Dec. 31, 2012
Class B [Member]
Dec. 28, 2010
Waiver Units [Member]
Dec. 31, 2012
Waiver Units [Member]
Aug. 14, 2012
Waiver Units [Member]
Feb. 14, 2012
Waiver Units [Member]
Dec. 31, 2012
Class One [Member]
Dec. 31, 2012
Class Two [Member]
Dec. 31, 2012
Class Three [Member]
Dec. 31, 2012
Class Four [Member]
Nov. 30, 2010
Cameron Highway Oil Pipeline Company [Member]
Dec. 28, 2010
General Partner Interest [Member]
Dec. 28, 2010
General Partners [Member]
Dec. 28, 2010
General Partners [Member]
Class A [Member]
Dec. 28, 2010
General Partners [Member]
Class B [Member]
Jul. 31, 2011
FMT Black Oil Barge Transportation Business [Member]
Class A [Member]
Partners Capital And Distributions [Line Items]                                                                      
Common units, outstanding         81,202,752 71,965,062                         81,162,755   39,997                            
Waiver units authorized                         1,738,000 1,738,000 1,738,000 1,738,000           7,000,000 3,476,466                        
Conversion feature, minimum distribution coverage ratio                                                   1.1 1.1 1.1 1.1            
Conversion feature threshold, quarterly distribution, minimum, per unit                                                   0.43 0.46 0.49 0.52            
Distribution paid per common unit   $ 0.4500     $ 0.4850 $ 0.4400 $ 0.4000 $ 0.4725 $ 0.4600 $ 0.4275 $ 0.4150 $ 0.4075                       $ 0.46 $ 0.44                    
Limited Partners' ownership percentage 98.00%       100.00%                                                            
General Partners Interest In Cash Distributions 2.00%                                                                    
General Partners' interest percentage 2.00%                               0.01%                           2.00%        
Number of common units issued         81,202,752 71,965,062                           5,750,000                   5,175,000   27,000,000 19,960,000 40,000 7,350,000
Cash or stock available for distributions, percent usually distributed         100.00% 100.00% 100.00%                                                        
Days to distribute         45 days 45 days 45 days                                                        
Price per share of common units issued   $ 30.80 $ 26.30 $ 23.58                           $ 30.80                                  
Proceeds received from offering, net of costs   $ 169,421,000 $ 184,969,000 $ 118,837,000                           $ 169,400,000                                 $ 185,000,000
Percentage of equity interest                                                           50.00%          
Issuance of common units for cash, net         169,421,000 184,969,000 116,347,000                                                        
Contribution of capital       2,500,000     2,500,000                                                        
Capital account percentage       2.00%                                                              
Non-cash contributions             $ 76,900,000