Inventories

Inventories consisted of the following:



(In thousands)	June 30, 2016		December 31, 2015
Raw materials:
Drilling fluids	$	116,651	$	133,934
Mats	1,376		657
Total raw materials	118,027		134,591

Blended drilling fluids components	24,270		25,343

Finished goods - mats	2,579		3,723

Total inventory	$	144,876	$	163,657

Raw materials consist primarily of barite, chemicals, and other additives that are consumed in the production of our drilling fluid systems. Our blended drilling fluids components consist of base drilling fluid systems that have been either mixed internally at our mixing plants or purchased from third-party vendors. These base systems require raw materials to be added, as required to meet specified customer requirements.

During the second quarter of 2016, we recognized a $0.6 million charge reported in cost of revenues to reduce the carrying value of diesel-based drilling fluid inventory in the Fluids Systems segment. The charge resulted from lower of cost or market adjustments primarily due to the decline in selling prices for our diesel-based drilling fluid products.