Segment Data - Disaggregated Revenues, Geographic (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 211,473	$ 227,293
Operating segments | Fluids systems
Disaggregation of Revenue [Line Items]
Revenues	160,653	177,379
Operating segments | Fluids systems | North America
Disaggregation of Revenue [Line Items]
Revenues	116,325	115,541
Operating segments | Fluids systems | United States
Disaggregation of Revenue [Line Items]
Revenues	103,059	92,469
Operating segments | Fluids systems | Canada
Disaggregation of Revenue [Line Items]
Revenues	13,266	23,072
Operating segments | Fluids systems | Total International
Disaggregation of Revenue [Line Items]
Revenues	44,328	61,838
Operating segments | Fluids systems | EMEA
Disaggregation of Revenue [Line Items]
Revenues	37,765	51,435
Operating segments | Fluids systems | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues	5,124	2,489
Operating segments | Fluids systems | Latin America
Disaggregation of Revenue [Line Items]
Revenues	$ 1,439	$ 7,914