Inventories (Tables)

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Schedule of inventories

Inventories consisted of the following at December 31:

(In thousands)	2017		2016
Raw materials:
Drilling fluids	$	123,022	$	115,399
Mats	1,419		1,137
Total raw materials	124,441		116,536
Blended drilling fluids components	30,495		23,762
Finished goods - mats	10,400		3,314
Total inventories	$	165,336	$	143,612