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Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Inventory [Line Items]
Raw materials:	$ 154,465		$ 124,441
Total inventory	202,707	$ 170,819	165,336
Drilling fluids
Inventory [Line Items]
Raw materials:	153,114		123,022
Mats
Inventory [Line Items]
Raw materials:	1,351		1,419
Finished goods	10,411		10,400
Blended drilling fluids components
Inventory [Line Items]
Finished goods	$ 37,831		30,495
Difference between revenue guidance in effect before and after Topic 606 \| ASU 2014-09
Inventory [Line Items]
Total inventory			$ 5,483