Segment Data - Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue, Major Customer [Line Items]
Revenues	$ 236,262	$ 183,020	$ 463,555	$ 341,711
Operating Income (Loss)	19,143	7,968	32,981	11,714
Operating segments | Fluids systems
Revenue, Major Customer [Line Items]
Revenues	179,738	150,623	357,117	286,673
Operating Income (Loss)	13,327	5,863	23,804	12,215
Operating segments | Mats and integrated services
Revenue, Major Customer [Line Items]
Revenues	56,524	32,397	106,438	55,038
Operating Income (Loss)	14,853	11,419	26,939	17,821
Corporate, non-segment | Corporate office
Revenue, Major Customer [Line Items]
Operating Income (Loss)	$ (9,037)	$ (9,314)	$ (17,762)	$ (18,322)