Inventories (Tables)

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Schedule of inventories

Inventories consisted of the following:

(In thousands)	March 31, 2018		December 31, 2017
Raw materials:
Drilling fluids	$	146,021	$	123,022
Mats	1,511		1,419
Total raw materials	147,532		124,441
Blended drilling fluids components	32,510		30,495
Finished goods - mats	9,067		10,400
Total inventory	$	189,109	$	165,336