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Exit Costs and Assets Held for Sale (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]      
Property, plant and equipment part of disposal group, held for sale $ 57,775 $ 37,859 $ 0
Retail Store [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations      
Restructuring Cost and Reserve [Line Items]      
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment 4,200 4,200  
Plant Nutrient Group [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations      
Restructuring Cost and Reserve [Line Items]      
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment 1,600 1,600  
Retail | Retail Segment      
Restructuring Cost and Reserve [Line Items]      
Exit charges 7,800    
Retail | Retail Segment | Disposal Group, Held-for-sale, Not Discontinued Operations      
Restructuring Cost and Reserve [Line Items]      
Property, plant and equipment part of disposal group, held for sale 57,800 37,900  
TENNESSEE | Grain Group [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations      
Restructuring Cost and Reserve [Line Items]      
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment 19,400 19,500  
Disposal Group, Including Discontinued Operation, Inventory 0 11,400  
Disposal Group, Including Discontinued Operation, Commodity Contract Asset $ 18,800 $ 1,200