Segment Reporting - Revenue by Product Sales and Services (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue from External Customer [Line Items]
Revenue	$ 156,778	$ 173,200	$ 169,038	$ 169,194	$ 173,207	$ 182,146	$ 175,475	$ 170,018	$ 668,210	$ 700,846	$ 647,819
Service [Member]
Revenue from External Customer [Line Items]
Revenue									474,193	486,820	480,264
Service [Member] | Reservoir Description [Member]
Revenue from External Customer [Line Items]
Revenue									389,801	387,098	393,742
Service [Member] | Production Enhancement [Member]
Revenue from External Customer [Line Items]
Revenue									84,392	99,722	86,522
Product [Member]
Revenue from External Customer [Line Items]
Revenue									194,017	214,026	167,555
Product [Member] | Reservoir Description [Member]
Revenue from External Customer [Line Items]
Revenue									31,096	25,984	21,478
Product [Member] | Production Enhancement [Member]
Revenue from External Customer [Line Items]
Revenue									$ 162,921	$ 188,042	$ 146,077