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Business Segment Information (Schedule of Revenues by Segment) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
segment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jul. 25, 2015
Jul. 24, 2015
Jul. 23, 2015
Segment Reporting [Abstract]                            
Number of operating segments | segment                 4          
Segment Reporting Information [Line Items]                            
Total Segment Margin [1]                 $ 594,543 $ 569,571 $ 476,585      
Capital Expenditures [2]                 1,580,821 443,993 2,007,611      
External Customers                 2,028,377 1,712,493 2,246,529      
Intersegment [3]                 0 0 0      
Total revenues $ 720,049 $ 486,114 $ 406,723 $ 415,491 $ 428,053 $ 460,050 $ 445,976 $ 378,414 2,028,377 1,712,493 $ 2,246,529      
SEKCO [Member]                            
Segment Reporting Information [Line Items]                            
Equity investment, ownership percentage                       50.00%    
Enterprise Offshore Acquisition [Member] | Deepwater Gateway LLC [Member]                            
Segment Reporting Information [Line Items]                            
Equity investment, ownership percentage                         50.00%  
Enterprise Offshore Acquisition [Member] | SEKCO [Member]                            
Segment Reporting Information [Line Items]                            
Equity investment, ownership percentage                     50.00%   50.00% 50.00%
Enterprise Offshore Acquisition [Member] | SEKCO [Member] | Co-venturer [Member] | Enterprise [Member]                            
Segment Reporting Information [Line Items]                            
Equity investment, ownership percentage                       50.00%    
Offshore Pipeline Transportation                            
Segment Reporting Information [Line Items]                            
Total revenues                 318,239 334,679 $ 140,230      
Offshore Pipeline Transportation | Deepwater Gateway LLC [Member]                            
Segment Reporting Information [Line Items]                            
Capital Expenditures                   35,100        
Offshore Pipeline Transportation | SEKCO [Member]                            
Segment Reporting Information [Line Items]                            
Capital Expenditures                     2,500      
Offshore Pipeline Transportation | Enterprise Offshore Acquisition [Member]                            
Segment Reporting Information [Line Items]                            
Capital Expenditures [3]                     1,500,000      
Sodium Minerals and Sulfur Services                            
Segment Reporting Information [Line Items]                            
Total revenues                 462,622 171,503 177,880      
Sodium Minerals and Sulfur Services | Alkali Business [Member]                            
Segment Reporting Information [Line Items]                            
Capital Expenditures                 1,300,000          
Onshore Facilities and Transportation                            
Segment Reporting Information [Line Items]                            
Total revenues                 1,042,229 993,290 1,689,662      
Marine Transportation                            
Segment Reporting Information [Line Items]                            
Total revenues                 205,287 213,021 238,757      
Operating Segments [Member] | Offshore Pipeline Transportation                            
Segment Reporting Information [Line Items]                            
Total Segment Margin [1]                 317,540 336,620 197,723      
Capital Expenditures [2]                 8,815 46,277 1,527,320      
External Customers                 319,455 332,514 140,230      
Operating Segments [Member] | Sodium Minerals and Sulfur Services                            
Segment Reporting Information [Line Items]                            
Total Segment Margin [1]                 130,333 79,508 80,246      
Capital Expenditures [2]                 1,354,469 2,274 1,595      
External Customers                 470,789 180,665 187,257      
Operating Segments [Member] | Onshore Facilities and Transportation                            
Segment Reporting Information [Line Items]                            
Total Segment Margin [1]                 96,376 83,364 95,394      
Capital Expenditures [2]                 149,123 316,638 409,687      
External Customers [1]                 1,044,083 993,103 1,688,850      
Operating Segments [Member] | Marine Transportation                            
Segment Reporting Information [Line Items]                            
Total Segment Margin [1]                 50,294 70,079 103,222      
Capital Expenditures [2]                 68,414 78,804 69,009      
External Customers                 194,050 206,211 230,192      
Intersegment Eliminations [Member] | Offshore Pipeline Transportation                            
Segment Reporting Information [Line Items]                            
Intersegment [3]                 (1,216) 2,165 0      
Intersegment Eliminations [Member] | Sodium Minerals and Sulfur Services                            
Segment Reporting Information [Line Items]                            
Intersegment [3]                 (8,167) (9,162) (9,377)      
Intersegment Eliminations [Member] | Onshore Facilities and Transportation                            
Segment Reporting Information [Line Items]                            
Intersegment [3]                 (1,854) 187 812      
Intersegment Eliminations [Member] | Marine Transportation                            
Segment Reporting Information [Line Items]                            
Intersegment [3]                 $ 11,237 $ 6,810 $ 8,565      
[1] A reconciliation of total Segment Margin to net income attributable to Genesis Energy, L.P. for each year is presented below.
[2] Capital expenditures include maintenance and growth capital expenditures, such as fixed asset additions (including enhancements to existing facilities and construction of growth projects) as well as acquisitions of businesses and contributions to equity investees related to same. In addition to construction of growth projects, capital spending in our sodium minerals and sulfur services segment included $1.3 billion during the year ended December 31, 2017 related to the acquisition of our Alkali Business. During the year ended December 31, 2016, capital expenditures in our offshore pipeline transportation segment included $35.1 million related to the acquisition of the remaining 50% ownership in Deepwater Gateway. Additionally, in 2015, there was $1.5 billion in capital spending to fund our Enterprise acquisition. Capital spending in this segment also included $2.5 million during the year ended December 31, 2015 representing capital contributions to our SEKCO pipeline to fund our share of the construction costs for its pipeline (as prior to our Enterprise acquisition in July 2015, we owned a 50% interest in the SEKCO pipeline with Enterprise owning the remaining 50%).
[3] Intersegment sales were conducted under terms that we believe were no more or less favorable than then-existing market conditions.