Net Income (Loss) Per Common Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share Reconciliation [Abstract]
Net Income (loss) Attributable to Genesis Energy L.P.	$ 17,557	$ (323)	$ 73,631	$ 18,708
Less: Accumulated distributions attributable to Class A Convertible Preferred Units	(18,684)	(17,635)	(55,783)	(51,780)
Net Income (Loss) Available to Common Unitholders	$ (1,127)	$ (17,958)	$ 17,848	$ (33,072)
Weighted Average Outstanding Units (in shares)	122,579,000	122,579,000	122,579,000	122,579,000
Basic and Diluted Net Loss per Common Unit (in dollars per unit)	$ (0.01)	$ (0.15)	$ 0.15	$ (0.27)
Class A Convertible Preferred Stock Units
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities not included in computation of dilutive earnings (in shares)	25,336,778		25,336,778