Inventories (Tables)

6 Months Ended

Jun. 30, 2018

Inventory, Net [Abstract]

Classes of inventories

Major classes of inventories are as follows:

(in thousands)	June 30, 2018		December 31, 2017		June 30, 2017
Grain	$	385,118	$	505,217	$	373,863
Ethanol and co-products	22,828		11,003		14,041
Plant nutrients and cob products	82,230		126,962		69,365
Retail merchandise	—		—		906
Railcar repair parts	5,435		5,521		5,030
	$	495,611	$	648,703	$	463,205