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Inventories (Tables)
 9 Months Ended
Sep. 30, 2018
Inventory, Net [Abstract]  
Classes of inventories Major classes of inventories are as follows:
(in thousands)
September 30,
2018
 
December 31,
2017
 
September 30,
2017
Grain
$
324,232

 
$
505,217

 
$
342,837

Ethanol and co-products
15,419

 
11,003

 
12,502

Plant nutrients and cob products
145,363

 
126,962

 
114,131

Retail merchandise
—

 
—

 
718

Railcar repair parts
5,317

 
5,521

 
5,414

 
$
490,331

 
$
648,703

 
$
475,602