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Acquisition (Selected Financial Information) (Details) - Alkali Business - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2018
SelectedFinancialInformation [Line Items] |  |
Revenues | $ 208,742 | $ 628,672
Net Income Attributable to Genesis Energy, L.P. | $ 29,536 | $ 91,680

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