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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