Business Segment Information (Reconciliation of Segment Margin to Net Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting [Abstract]
Total Segment Margin	$ 607,473	$ 713,262	$ 712,758
Corporate general and administrative expenses	(51,457)	(52,755)	(64,683)
Depreciation, depletion, amortization and accretion	(302,602)	(308,115)	(317,186)
Interest expense	(209,779)	(219,440)	(229,191)
Adjustment to exclude distributable cash generated by equity investees not included in income and include equity in investees net income	(17,042)	(20,847)	(28,088)	[1]
Non-cash items not included in Segment Margin	(5,847)	(14,642)	9,698
Distributions from unrestricted subsidiaries not included in income	(70,490)	(8,421)	(7,633)
Cancellation of debt income	27,302	0	0
Loss on debt extinguishment	(31,730)	0	(3,339)
Differences in timing of cash receipts for certain contractual arrangements	(40,848)	8,478	6,629	[2]
(Loss) gain on sales of assets (Note 7)	(22,045)	0	42,264
Non-cash provision for leased items no longer in use	(1,347)	1,367	476
Income tax expense	(1,327)	(655)	(1,498)
Net income attributable to redeemable noncontrolling interests	(16,113)	(2,233)	0
Impairment expense (Note 7)	(280,826)	0	(126,282)
NET INCOME (LOSS) ATTRIBUTABLE TO GENESIS ENERGY, L.P.	(416,678)	95,999	(6,075)
Segment Reporting Information [Line Items]
Distributions from unrestricted subsidiaries not included in income	70,490	8,421	7,633
NEJD Pipeline | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Segment Reporting [Abstract]
Distributions from unrestricted subsidiaries not included in income	(48,000)	(8,400)	(7,600)
Segment Reporting Information [Line Items]
Distributions from unrestricted subsidiaries not included in income	48,000	$ 8,400	$ 7,600
Free State Pipeline | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Segment Reporting [Abstract]
Distributions from unrestricted subsidiaries not included in income	(22,500)
Segment Reporting Information [Line Items]
Distributions from unrestricted subsidiaries not included in income	$ 22,500

[1] Includes distributions attributable to the period and received during or promptly following such period.(2)    2020 includes cash payments received from our NEJD pipeline of $48.0 million not included in income and distributions from our Free State pipeline of $22.5 million not included in income, both of which are defined as unrestricted subsidiaries under our senior secured credit agreement. 2019 and 2018 include cash payments received from our NEJD pipeline of $8.4 and $7.6 million not included in income, respectively.

[2] Includes the difference in timing of cash receipts from customers during the period and the revenue we recognize in accordance with GAAP on our related contracts.