Inventories (Tables)

6 Months Ended

Jun. 30, 2018

Inventory Disclosure [Abstract]

Schedule of inventories

Inventories consisted of the following:

(In thousands)	June 30, 2018		December 31, 2017
Raw materials:
Drilling fluids	$	144,674	$	123,022
Mats	1,780		1,419
Total raw materials	146,454		124,441
Blended drilling fluids components	36,280		30,495
Finished goods - mats	6,837		10,400
Total inventory	$	189,571	$	165,336