Inventories (Tables)

3 Months Ended

Mar. 31, 2021

Inventory, Net [Abstract]

Classes of inventories

(in thousands)	March 31, 2021		December 31, 2020		March 31, 2020
Grain and other agricultural products (a)	$	971,914	$	1,025,809	$	750,281
Frac sand and propane (a)	8,388		12,477		5,723
Ethanol and co-products (a)	136,234		114,895		87,706
Plant nutrients and cob products	171,101		139,885		178,028
Railcar repair parts	7,424		7,627		6,338
Total Inventories	$	1,295,061	$	1,300,693	$	1,028,076

(a) Includes RMI of $942.4 million, $983.2 million and $712.3 million at March 31, 2021, December 31, 2020 and March 31, 2020, respectively.