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Inventories (Tables)
 12 Months Ended
Dec. 31, 2019
Inventory, Net [Abstract]  
Schedule of Major Classes of Inventories

Major classes of inventories are as follows:
 
December 31,
(in thousands)
2019
 
2018
Grain and other agricultural products
$
907,482

 
$
527,471

Frac sand and propane
15,438

 
—

Ethanol and co-products
95,432

 
11,918

Plant nutrients and cob products
146,164

 
145,693

Railcar repair parts
6,020

 
5,722

 
$
1,170,536

 
$
690,804