Segment Reporting And Other Disaggregated Information - Revenue by Product Sales and Services (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue from External Customer [Line Items]
Revenue	$ 113,749	$ 105,382	$ 115,736	$ 152,400	$ 156,778	$ 173,200	$ 169,038	$ 169,194	$ 487,267	$ 668,210	$ 700,846
Service [Member]
Revenue from External Customer [Line Items]
Revenue									376,421	474,193	486,820
Service [Member] | Reservoir Description [Member]
Revenue from External Customer [Line Items]
Revenue									332,085	389,801	387,098
Service [Member] | Production Enhancement [Member]
Revenue from External Customer [Line Items]
Revenue									44,336	84,392	99,722
Product [Member]
Revenue from External Customer [Line Items]
Revenue									110,846	194,017	214,026
Product [Member] | Reservoir Description [Member]
Revenue from External Customer [Line Items]
Revenue									22,956	31,096	25,984
Product [Member] | Production Enhancement [Member]
Revenue from External Customer [Line Items]
Revenue									$ 87,890	$ 162,921	$ 188,042