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Inventories (Tables)
3 Months Ended
Mar. 31, 2019
Inventory, Net [Abstract]  
Classes of inventories Major classes of inventories are as follows:
(in thousands)
March 31,
2019
 
December 31,
2018
 
March 31,
2018
Grain and other agricultural products
$
812,361

 
$
527,471

 
$
541,272

Frac sand and propane
8,172

 

 

Ethanol and co-products
16,302

 
11,918

 
14,320

Plant nutrients and cob products
183,886

 
145,693

 
170,748

Railcar repair parts
5,744

 
5,722

 
5,289

 
$
1,026,465

 
$
690,804

 
$
731,629