Net Income (Loss) Per Common Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share Reconciliation [Abstract]
Net Income Attributable to Genesis Energy L.P.	$ 40,120	$ 10,997	$ 56,074	$ 19,031
Less: Accumulated distributions attributable to Class A Convertible Preferred Units	(18,684)	(17,257)	(37,099)	(34,145)
Net Income (Loss) Available to Common Unitholders	$ 21,436	$ (6,260)	$ 18,975	$ (15,114)
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)	$ 0.17	$ (0.05)	$ 0.15	$ (0.12)
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