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Inventories (Tables)
 6 Months Ended
Jun. 30, 2019
Inventory, Net [Abstract]  
Classes of inventories
Major classes of inventories are as follows:
(in thousands)
June 30,
2019
 
December 31,
2018
 
June 30,
2018
Grain and other agricultural products
$
603,318

 
$
527,471

 
$
385,118

Frac sand and propane
9,287

 
—

 
—

Ethanol and co-products
26,185

 
11,918

 
22,828

Plant nutrients and cob products
109,156

 
145,693

 
82,230

Railcar repair parts
5,695

 
5,722

 
5,435

 
$
753,641

 
$
690,804

 
$
495,611