Inventories (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Inventory [Line Items]
Raw materials:	$ 111,884	$ 134,591
Total inventory	138,747	163,657
Drilling fluids
Inventory [Line Items]
Raw materials:	111,166	133,934
Mats
Inventory [Line Items]
Raw materials:	718	657
Finished goods	2,790	3,723
Blended drilling fluids components
Inventory [Line Items]
Finished goods	24,073	$ 25,343
Fluids systems | Cost of sales
Inventory [Line Items]
Inventory write-down	$ 1,500