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Goodwill and Other Intangible Assets (Changes in Goodwill) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Roll Forward] |  |  |
Goodwill at beginning of period | $ 135,360 | $ 6,024 | $ 6,024
Goodwill, Transfers | 0 |  |
Acquisitions | 349 | 129,336 | 0
Impairments | 0 | 0 | 0
Goodwill at end of period | 135,709 | 135,360 | 6,024
Trade |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill at beginning of period | 127,781 | 1,171 | 1,171
Goodwill, Transfers | (5,714) |  |
Acquisitions | 0 | 126,610 | 0
Impairments | 0 | 0 | 0
Goodwill at end of period | 122,067 | 127,781 | 1,171
Plant Nutrient |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill at beginning of period | 686 | 686 | 686
Goodwill, Transfers | 0 |  |
Acquisitions | 0 | 0 | 0
Impairments | 0 | 0 | 0
Goodwill at end of period | 686 | 686 | 686
Rail |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill at beginning of period | 4,167 | 4,167 | 4,167
Goodwill, Transfers | 0 |  |
Acquisitions | 0 | 0 | 0
Impairments | 0 | 0 | 0
Goodwill at end of period | 4,167 | 4,167 | 4,167
Ethanol |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill at beginning of period | 2,726 | 0 | 0
Goodwill, Transfers | 5,714 |  |
Acquisitions | 349 | 2,726 | 0
Impairments | 0 | 0 | 0
Goodwill at end of period | $ 8,789 | $ 2,726 | $ 0

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