Net Income (Loss) Per Common Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share Reconciliation [Abstract]
Net Income (loss) Attributable to Genesis Energy L.P.	$ (34,224)	$ 24,909
Less: Accumulated distributions attributable to Class A Convertible Preferred Units	(18,684)	(18,684)
NET INCOME (LOSS) AVAILABLE TO COMMON UNITHOLDERS	$ (52,908)	$ 6,225
Weighted Average Outstanding Units (in shares)	122,579,000	122,579,000
Basic and Diluted Net Loss per Common Unit (in dollars per unit)	$ (0.43)	$ 0.05
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