Inventories, net (Tables)

6 Months Ended

Jun. 30, 2020

Inventory Disclosure [Abstract]

Schedule of inventories

Inventories, net, consisted of the following as of June 30, 2020 and December 31, 2019:

	(Thousands of Dollars)
	June 30, 2020		December 31, 2019
Sand, including freight	$	5,643	$	4,405
Chemicals and consumables	2,662		11,408
Materials and supplies	34,848		45,828
Total inventory, net	$	43,153	$	61,641