Inventories (Tables)

9 Months Ended

Sep. 30, 2020

Inventory, Net [Abstract]

Classes of inventories

(in thousands)	September 30, 2020		December 31, 2019		September 30, 2019
Grain and other agricultural products (a)	$	557,808	$	907,482	$	560,626
Frac sand and propane	10,064		15,438		14,592
Ethanol and co-products (b)	59,543		95,432		26,218
Plant nutrients and cob products	120,173		146,164		133,839
Railcar repair parts	7,016		6,020		5,811
Total Inventories	$	754,604	$	1,170,536	$	741,086

(a) Includes RMI of $512.9 million, $852.6 million and $488.2 million at September 30, 2020, December 31, 2019 and September 30, 2019, respectively.

(b) Includes RMI of $10.4 million, $10.6 million and $12.6 million at September 30, 2020, December 31, 2019 and September 30, 2019, respectively.