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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.

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