Segment Data - Disaggregated Revenues, Geographic (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 216,412	$ 236,262	$ 427,885	$ 463,555
Operating segments | Fluids systems
Disaggregation of Revenue [Line Items]
Revenues	172,544	179,738	333,197	357,117
Operating segments | Fluids systems | North America
Disaggregation of Revenue [Line Items]
Revenues	122,142	115,618	238,467	231,159
Operating segments | Fluids systems | United States
Disaggregation of Revenue [Line Items]
Revenues	117,154	104,333	220,213	196,802
Operating segments | Fluids systems | Canada
Disaggregation of Revenue [Line Items]
Revenues	4,988	11,285	18,254	34,357
Operating segments | Fluids systems | Total International
Disaggregation of Revenue [Line Items]
Revenues	50,402	64,120	94,730	125,958
Operating segments | Fluids systems | EMEA
Disaggregation of Revenue [Line Items]
Revenues	44,455	49,546	82,220	100,981
Operating segments | Fluids systems | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	4,539	5,671	9,663	8,160
Operating segments | Fluids systems | Latin America
Disaggregation of Revenue [Line Items]
Revenues	$ 1,408	$ 8,903	$ 2,847	$ 16,817