Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	$ 170,018	$ 156,609
Inter-segment revenue	0	0
Segment operating income (loss)	32,316	23,539
Total assets (at end of period)	597,140	580,416	$ 584,812
Capital expenditures	4,443	6,449
Depreciation and amortization	5,818	6,304
Services	119,786	120,602
Product sales	50,232	36,007
Operating Segments \| Reservoir Description
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	100,809	104,895
Inter-segment revenue	47	174
Segment operating income (loss)	14,757	15,940
Total assets (at end of period)	319,830	320,543
Capital expenditures	2,181	2,577
Depreciation and amortization	4,248	4,620
Operating Segments \| Production Enhancement
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	69,209	51,714
Inter-segment revenue	51	201
Segment operating income (loss)	17,687	7,755
Total assets (at end of period)	217,935	196,298
Capital expenditures	1,847	3,020
Depreciation and amortization	1,002	1,164
Corporate & Other
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	0	0
Inter-segment revenue	(98)	(375)
Segment operating income (loss)	(128)	(156)
Total assets (at end of period)	59,375	63,575
Capital expenditures	415	852
Depreciation and amortization	$ 568	$ 520

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
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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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
-Name Accounting Standards Codification
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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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-Name Accounting Standards Codification
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-Section 45
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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

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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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Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and 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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