Net Income Per Common Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share Reconciliation [Abstract]
Net Income Attributable to Genesis Energy L.P.	$ 10,997	$ 33,733	$ 19,031	$ 60,823
Less: Accumulated distributions attributable to Class A Convertible Preferred Units	(17,257)	0	(34,145)	0
Net Income (loss) Available to Common Unitholders	$ (6,260)	$ 33,733	$ (15,114)	$ 60,823
Weighted Average Outstanding Shares (in shares)	122,579,000	122,579,000	122,579,000	120,495,000
Basic and Diluted Net Income per Common Unit (in dollars per unit)	$ (0.05)	$ 0.28	$ (0.12)	$ 0.50
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)	23,402,956		23,402,956