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Inventories (Tables)
9 Months Ended
Sep. 30, 2019
Inventory, Net [Abstract]  
Classes of inventories
Major classes of inventories are as follows:
(in thousands)
September 30,
2019
 
December 31,
2018
 
September 30,
2018
Grain and other agricultural products
$
560,626

 
$
527,471

 
$
324,232

Frac sand and propane
14,592

 

 

Ethanol and co-products
26,218

 
11,918

 
15,419

Plant nutrients and cob products
133,839

 
145,693

 
145,363

Railcar repair parts
5,811

 
5,722

 
5,317

Total Inventories
$
741,086

 
$
690,804

 
$
490,331