Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Inventory [Line Items]
Raw materials:	$ 146,263	$ 150,222
Total inventory	186,495	196,896
Fluids systems
Inventory [Line Items]
Raw materials:	139,591	148,737
Mats and integrated services
Inventory [Line Items]
Raw materials:	6,672	1,485
Finished goods	4,077	8,586
Blended fluids systems components
Inventory [Line Items]
Finished goods	$ 36,155	$ 38,088

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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