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Inventories (Tables)
 12 Months Ended
Dec. 31, 2018
Inventory, Net [Abstract]  
Schedule of Major Classes of Inventories Major classes of inventories are as follows:
 
December 31,
(in thousands)
2018
 
2017
Grain
$
527,471

 
$
505,217

Ethanol and co-products
11,918

 
11,003

Plant nutrients and cob products
145,693

 
126,962

Railcar repair parts
5,722

 
5,521

 
$
690,804

 
$
648,703