Segment Reporting (Details) $ in Thousands	3 Months Ended
Mar. 31, 2019 USD ($) segment	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| segment	2
Revenue	$ 169,194	$ 170,018
Segment operating income	16,414	32,316
Total assets (at end of period)	791,760	597,140	$ 648,827
Capital expenditures	5,183	4,443
Depreciation and amortization	5,587	5,818
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	0	0
Reservoir Description [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	103,292	100,809
Segment operating income	6,179	14,757
Total assets (at end of period)	342,617	319,830
Capital expenditures	1,902	2,181
Depreciation and amortization	3,987	4,248
Reservoir Description [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	96	47
Production Enhancement [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	65,902	69,209
Segment operating income	9,912	17,687
Total assets (at end of period)	290,734	217,935
Capital expenditures	2,851	1,847
Depreciation and amortization	1,183	1,002
Production Enhancement [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	44	51
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Revenue	0	0
Segment operating income	323	(128)
Total assets (at end of period)	158,409	59,375
Capital expenditures	430	415
Depreciation and amortization	417	568
Corporate and Other [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	$ (140)	$ (98)

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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