Goodwill (Details) $ in Thousands	9 Months Ended
Sep. 30, 2020 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 135,360
Reorganization	0
Acquisitions	349
Goodwill, ending balance	135,709
Trade
Goodwill [Roll Forward]
Goodwill, beginning balance	127,781
Reorganization	(5,714)
Acquisitions	0
Goodwill, ending balance	122,067
Ethanol
Goodwill [Roll Forward]
Goodwill, beginning balance	2,726
Reorganization	5,714
Acquisitions	349
Goodwill, ending balance	8,789
Plant Nutrient
Goodwill [Roll Forward]
Goodwill, beginning balance	686
Reorganization	0
Acquisitions	0
Goodwill, ending balance	686
Rail
Goodwill [Roll Forward]
Goodwill, beginning balance	4,167
Reorganization	0
Acquisitions	0
Goodwill, ending balance	$ 4,167

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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- Definition

Amount of transfers into (out of) an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
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