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Exit Costs and Assets Held for Sale (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
--- | --- | --- | ---
Restructuring Cost and Reserve [Line Items] |  |  |
Assets held for sale | $ 151 | $ 392 | $ 9,816
Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Assets held for sale |  |  | 9,800
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 | Rail Group |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Assets held for sale |  |  | 4,100
Disposal Group, Held-for-sale, Not Discontinued Operations | Grain Group |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Assets held for sale |  |  | 1,300
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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