Business Segment Information (Reconciliation of Segment Margin to (Loss) Income from Continuing Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting [Abstract]
Total Segment Margin	$ 161,857	$ 175,819	$ 470,470	$ 533,495
Corporate general and administrative expenses	(10,801)	(15,276)	(42,160)	(39,878)
Depreciation, depletion, amortization and accretion	(70,203)	(87,209)	(228,761)	(233,250)
Interest expense	(51,312)	(54,673)	(157,895)	(165,881)
Adjustment to exclude distributable cash generated by equity investees not included in income and include equity in investees net income (1)	(2,318)	(7,682)	(14,500)	(18,185)
Other non-cash items (2)	7,712	9,880	16,489	(7,223)
Cash payments from direct financing leases in excess of earnings (3)	(44,088)	(2,131)	(48,620)	(6,238)
Cancellation of debt income (4)	809	0	20,534	0
Loss on extinguishment of debt (4)	0	0	(23,480)	0
Differences in timing of cash receipts for certain contractual arrangements	(13,052)	(1,249)	(29,180)	10,886
Impairment expense	(3,331)	0	(280,826)	0
Provision for leased items no longer in use	(696)	461	(624)	833
Redeemable noncontrolling interest redemption value adjustments	(4,149)	(272)	(12,394)	(272)
Income tax expense	(145)	(111)	(575)	(656)
NET INCOME ATTRIBUTABLE TO GENESIS ENERGY, L.P.	(29,717)	17,557	(331,522)	73,631
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Unrealized gain (loss) from valuation of embedded derivatives			19,582	(4,231)
Embedded Derivative Financial Instruments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Unrealized gain (loss) from valuation of embedded derivatives	$ 6,700	$ 8,000	$ 17,400	$ 300