Business Segment Information (Reconciliation of Segment Margin to (Loss) Income from Continuing Operations) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Feb. 15, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting [Abstract]
Total Segment Margin		$ 183,207	$ 146,514	$ 527,301	$ 419,159
Corporate general and administrative expenses		(23,760)	(18,230)	(47,686)	(33,694)
Depreciation, depletion, amortization and accretion		(94,522)	(66,436)	(252,392)	(184,213)
Interest expense		(58,819)	(47,388)	(172,864)	(122,117)
Adjustment to exclude distributable cash generated by equity investees not included in income and include equity in investees net income (1)		(7,552)	(7,136)	(26,646)	(25,566)
Other non-cash items		(999)	(4,788)	(7,774)	(6,218)
Cash payments from direct financing leases in excess of earnings		(1,931)	(1,751)	(5,654)	(5,127)
Loss on extinguishment of debt	$ (3,300)	0	0	(3,339)	0
Differences in timing of cash receipts for certain contractual arrangements		792	5,847	5,271	11,694
Gain on sale of assets		3,363	0	3,363	26,684
Non-cash provision for leased items no longer in use		181	0	42	(12,589)
Income tax expense		(283)	(320)	(914)	(878)
NET INCOME (LOSS) ATTRIBUTABLE TO GENESIS ENERGY, L.P.		$ (323)	$ 6,312	$ 18,708	$ 67,135