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Net Income Per Common Unit (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 01, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Class A convertible preferred units issued (in shares) | 22,411,728 |  |  |  |  |  |  |  | 22,411,728 |  |  |
Net Income Attributable to Genesis Energy L.P. | $ 15,512 | $ 6,312 | $ 33,733 | $ 27,090 | $ 22,118 | $ 32,101 | $ 23,727 | $ 35,303 | $ 82,647 | $ 113,249 | $ 422,528 |
Less: Accumulated distributions attributable to Class A Convertible Preferred Units |  |  |  |  |  |  |  |  | (21,995) | 0 | 0 |
Net Income Available to Common Unitholders |  |  |  |  |  |  |  |  | $ 60,652 | $ 113,249 | $ 422,528 |
Weighted Average Outstanding Units (in units) |  |  |  |  |  |  |  |  | 121,546,000 | 113,433,000 | 103,004,000 |
Basic and Diluted (in dollars per unit) |  |  |  |  |  |  |  |  | $ 0.50 | $ 1.00 | $ 4.10 |
Private Placement [Member] | Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Class A convertible preferred units issued (in shares) | 22,411,728 |  |  |  |  |  |  |  | 22,411,728 |  |  | 22,249,494
Alkali Business [Member] |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basic and Diluted (in dollars per unit) |  |  |  |  |  |  |  |  | $ 0.50 | $ 1.00 | $ 4.10 |

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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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