Inventories (Tables)

3 Months Ended

Mar. 31, 2019

Inventory Disclosure [Abstract]

Schedule of inventories

Inventories consisted of the following:

(In thousands)	March 31, 2019		December 31, 2018
Raw materials:
Fluids systems	$	139,591	$	148,737
Mats and integrated services	6,672		1,485
Total raw materials	146,263		150,222
Blended fluids systems components	36,155		38,088
Finished goods - mats	4,077		8,586
Total inventories	$	186,495	$	196,896