Acquisitions (Schedule of Pro Forma Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic and diluted earnings per common unit:
As reported net income per common unit (in dollars per unit)	$ 0.18	$ (0.62)	$ 0.50
Alkali Business
Pro forma consolidated financial operating results:
Revenues			$ 2,549,438
Net Income Attributable to Genesis Energy, L.P.			108,392
Net Income Available to Common Unitholders			$ 42,768
Basic and diluted earnings per common unit:
As reported net income per common unit (in dollars per unit)			$ 0.50
Pro forma net income per common unit, basic and diluted (in dollars per unit)			$ 0.35