Segment Reporting (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) segment	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| segment			2
Revenue from unaffiliated clients	$ 182,146	$ 162,887	$ 527,639	$ 477,708
Inter-segment revenue	0	0	0	0
Segment operating income	34,879	26,669	100,644	77,563
Total assets (at end of period)	666,597	582,744	666,597	582,744	$ 584,812
Capital expenditures	4,148	4,902	16,063	14,264
Depreciation and amortization	5,680	5,993	17,366	18,486
Operating Segments \| Reservoir Description
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	103,609	101,442	306,525	310,650
Inter-segment revenue	58	54	178	275
Segment operating income	14,956	14,621	44,473	49,231
Total assets (at end of period)	321,025	315,346	321,025	315,346
Capital expenditures	2,437	2,930	10,002	7,605
Depreciation and amortization	4,138	4,383	12,675	13,531
Operating Segments \| Production Enhancement
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	78,537	61,445	221,114	167,058
Inter-segment revenue	141	87	293	537
Segment operating income	19,243	12,165	55,357	28,633
Total assets (at end of period)	276,345	203,413	276,345	203,413
Capital expenditures	1,680	1,605	5,465	5,394
Depreciation and amortization	1,037	1,092	3,045	3,398
Corporate & Other
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	0	0	0	0
Inter-segment revenue	(199)	(141)	(471)	(812)
Segment operating income	680	(117)	814	(301)
Total assets (at end of period)	69,227	63,985	69,227	63,985
Capital expenditures	31	367	596	1,265
Depreciation and amortization	$ 505	$ 518	$ 1,646	1,557
Discontinued Operations \| General and Administrative Overhead Costs \| Production Enhancement
Segment Reporting Information [Line Items]
Reclassification adjustment				682
Discontinued Operations \| General and Administrative Overhead Costs \| Corporate & Other
Segment Reporting Information [Line Items]
Reclassification adjustment				$ (682)

Income (loss) before interest expense and income taxes.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The amount of a reclassification adjustment made to prior period financial statement amounts.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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