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Inventories (Tables)
 6 Months Ended
Jun. 30, 2017
Inventory, Net [Abstract]  
Classes of inventories
Major classes of inventories are as follows:
(in thousands)
June 30,
2017
 
December 31,
2016
 
June 30,
2016
Grain
$
373,863

 
$
495,139

 
$
348,757

Ethanol and co-products
14,041

 
10,887

 
15,298

Plant nutrients and cob products
69,365

 
150,259

 
91,227

Retail merchandise
906

 
20,678

 
25,161

Railcar repair parts
5,030

 
5,784

 
5,793

 
$
463,205

 
$
682,747

 
$
486,236