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Exit Costs and Assets Held for Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | --- | ---
Restructuring Cost and Reserve [Line Items] |  |  |
Assets held for sale | $ 573 | $ 392 | $ 29,527
Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Assets held for sale | $ 600 |  | 29,500
Disposal Group, Held-for-sale, Not Discontinued Operations | Rail Group |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Assets held for sale |  |  | 25,100
Disposal Group, Held-for-sale, Not Discontinued Operations | Grain Group |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Assets held for sale |  |  | 4,400
Disposal Group, Held-for-sale, Not Discontinued Operations | Retail Store |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Assets held for sale |  |  | 4,200
Disposal Group, Held-for-sale, Not Discontinued Operations | Plant Nutrient Group |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Assets held for sale |  |  | $ 200

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