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Acquisitions (Schedule of Pro Forma Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Basic and diluted earnings per common unit: |  |  |
As reported net income per common unit (in dollars per share) | $ 0.50 | $ 1.00 | $ 4.10
Alkali Business [Member] |  |  |
Pro forma consolidated financial operating results: |  |  |
Revenues | $ 2,549,438 | $ 2,498,293 | $ 3,043,529
Net Income Attributable to Genesis Energy, L.P. | 84,010 | 120,515 | 416,118
Net Income Available to Common Unitholders | $ 18,953 | $ 57,057 | $ 351,436
Basic and diluted earnings per common unit: |  |  |
As reported net income per common unit (in dollars per share) | $ 0.50 | $ 1.00 | $ 4.10
Pro forma net income per common unit (in dollars per share) | 0.16 | 0.50 | 3.41
Pro forma net income per common unit, dilutive (in dollars per share) | $ 0.16 | $ 0.50 | $ 3.33
Enterprise Offshore Acquisition [Member] |  |  |
Pro forma consolidated financial operating results: |  |  |
Revenues |  |  | $ 2,421,989
Net Income Attributable to Genesis Energy, L.P. |  |  | $ 425,363
Basic and diluted earnings per common unit: |  |  |
Income (Loss) from Continuing Operations, Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted, Net of Tax |  |  | $ 4.09
Business Acquisition, Pro Forma Earnings Per Unit, Basic And Diluted |  |  | $ 3.91

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