Inventories (Tables)

9 Months Ended

Sep. 30, 2018

Inventory Disclosure [Abstract]

Schedule of inventories

Inventories consisted of the following:

(In thousands)	September 30, 2018		December 31, 2017
Raw materials:
Drilling fluids	$	153,114	$	123,022
Mats	1,351		1,419
Total raw materials	154,465		124,441
Blended drilling fluids components	37,831		30,495
Finished goods - mats	10,411		10,400
Total inventory	$	202,707	$	165,336