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Goodwill and Other Intangible Assets (Changes in Goodwill) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Roll Forward] |  |  |
Goodwill at beginning of period | $ 6,024,000 | $ 6,024,000 | $ 63,934,000
Acquisitions | 129,336,000 | 0 | 1,171,000
Impairments | 0 | 0 | (59,081,000)
Goodwill at end of period | 135,360,000 | 6,024,000 | 6,024,000
Trade |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill at beginning of period | 1,171,000 | 1,171,000 | 0
Acquisitions | 126,610,000 | 0 | 1,171,000
Impairments | 0 | 0 | 0
Goodwill at end of period | 127,781,000 | 1,171,000 | 1,171,000
Plant Nutrient |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill at beginning of period | 686,000 | 686,000 | 59,767,000
Acquisitions | 0 | 0 | 0
Impairments | 0 | 0 | (59,081,000)
Goodwill at end of period | 686,000 | 686,000 | 686,000
Rail |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill at beginning of period | 4,167,000 | 4,167,000 | 4,167,000
Acquisitions | 0 | 0 | 0
Impairments | 0 | 0 | 0
Goodwill at end of period | 4,167,000 | 4,167,000 | 4,167,000
Ethanol |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill at beginning of period | 0 | 0 | 0
Acquisitions | 2,726,000 | 0 | 0
Impairments | 0 | 0 | 0
Goodwill at end of period | $ 2,726,000 | $ 0 | $ 0

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- Definition 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. + References 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 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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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 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Definition Amount of loss from the write-down 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266 + Details
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