Inventories (Tables)

12 Months Ended

Dec. 31, 2018

Inventory Disclosure [Abstract]

Schedule of inventories

Inventories consisted of the following at December 31:

(In thousands)	2018		2017
Raw materials:
Drilling fluids	$	148,737	$	123,022
Mats	1,485		1,419
Total raw materials	150,222		124,441
Blended drilling fluids components	38,088		30,495
Finished goods - mats	8,586		10,400
Total inventories	$	196,896	$	165,336