Goodwill (Details) $ in Thousands	6 Months Ended
Jun. 30, 2020 USD ($)
Goodwill [Roll Forward]
Balance as of January 1, 2020	$ 135,360
Reorganization	0
Acquisitions	349
Balance as of June 30, 2020	135,709
Trade
Goodwill [Roll Forward]
Balance as of January 1, 2020	127,781
Reorganization	(5,714)
Acquisitions	0
Balance as of June 30, 2020	122,067
Ethanol
Goodwill [Roll Forward]
Balance as of January 1, 2020	2,726
Reorganization	5,714
Acquisitions	349
Balance as of June 30, 2020	8,789
Plant Nutrient
Goodwill [Roll Forward]
Balance as of January 1, 2020	686
Reorganization	0
Acquisitions	0
Balance as of June 30, 2020	686
Rail
Goodwill [Roll Forward]
Balance as of January 1, 2020	4,167
Reorganization	0
Acquisitions	0
Balance as of June 30, 2020	$ 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
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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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
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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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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
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