Segment Reporting (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) segment	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| segment			2
Revenue	$ 173,200	$ 182,146	$ 511,432	$ 527,639
Segment operating income	31,207	34,879	75,629	100,644
Total assets (at end of period)	787,696	666,597	787,696	666,597	$ 648,827
Capital expenditures	5,307	4,148	17,537	16,063
Depreciation and amortization	5,697	5,680	17,070	17,366
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Reservoir Description [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	109,339	103,609	318,280	306,525
Segment operating income	18,835	14,956	40,892	44,473
Total assets (at end of period)	347,475	321,025	347,475	321,025
Capital expenditures	3,260	2,437	7,906	10,002
Depreciation and amortization	3,684	4,138	11,505	12,675
Reservoir Description [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	99	58	346	178
Production Enhancement [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	63,861	78,537	193,152	221,114
Segment operating income	11,456	19,243	31,792	55,357
Total assets (at end of period)	287,431	276,345	287,431	276,345
Capital expenditures	1,982	1,680	9,114	5,465
Depreciation and amortization	1,650	1,037	4,377	3,045
Production Enhancement [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	199	141	419	293
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Revenue	0	0
Segment operating income	916	680	2,945	814
Total assets (at end of period)	152,790	69,227	152,790	69,227
Capital expenditures	65	31	517	596
Depreciation and amortization	363	505	1,188	1,646
Corporate and Other [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	$ (298)	$ (199)	$ (765)	$ (471)

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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