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Acquisition (Schedule of Pro Forma Information) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |
As reported net income per unit (in dollars per share) | $ (0.05) | $ 0.28 | $ (0.12) | $ 0.50
Alkali Business |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |
Revenues |  | $ 608,000 |  | $ 1,214,100
Net Income Attributable to Genesis Energy, L.P. |  | 45,435 |  | 81,925
Net Income Available to Common Unitholders |  | $ 28,670 |  | $ 48,753
As reported net income per unit (in dollars per share) |  | $ 0.28 |  | $ 0.50
Pro forma net income per unit (in dollars per share) |  | $ 0.23 |  | $ 0.40

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