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Inventories (Tables)
 12 Months Ended
Dec. 31, 2016
Inventory, Net [Abstract]  
Classes of inventories
Major classes of inventories are as follows:
 
December 31,
(in thousands)
2016
 
2015
Grain
$
495,139

 
$
534,548

Ethanol and by-products
10,887

 
8,576

Plant nutrients and cob products
150,259

 
172,815

Retail merchandise
20,678

 
24,510

Railcar repair parts
5,784

 
6,894

Other
—

 
56

 
$
682,747

 
$
747,399