Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	$ 148,069	$ 203,889	$ 301,716	$ 417,532
Inter-segment revenue	0	0	0	0
Segment operating income (loss)	20,227	47,893	43,167	90,610
Total assets (at end of period)	572,106	658,985	572,106	658,985	$ 625,258
Capital expenditures	2,444	5,441	5,302	12,310
Depreciation and amortization	6,751	6,930	13,598	13,496
Operating Segments [Member] \| Reservoir Description [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	102,962	118,911	204,511	240,670
Inter-segment revenue	386	2,411	2,293	5,187
Segment operating income (loss)	19,209	30,944	37,429	59,474
Total assets (at end of period)	309,308	330,417	309,308	330,417
Capital expenditures	2,266	4,297	4,340	8,734
Depreciation and amortization	4,454	4,232	8,890	8,015
Operating Segments [Member] \| Production Enhancement [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	39,149	70,589	83,294	145,734
Inter-segment revenue	164	652	384	1,369
Segment operating income (loss)	755	14,376	4,896	24,299
Total assets (at end of period)	192,729	229,899	192,729	229,899
Capital expenditures	160	709	538	2,512
Depreciation and amortization	1,343	1,649	2,768	3,410
Operating Segments [Member] \| Reservoir Management [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	5,958	14,389	13,911	31,128
Inter-segment revenue	24	58	29	207
Segment operating income (loss)	422	3,452	909	7,318
Total assets (at end of period)	17,925	26,048	17,925	26,048
Capital expenditures	8	45	16	266
Depreciation and amortization	335	422	698	853
Corporate & Other [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	0	0	0	0
Inter-segment revenue	(574)	(3,121)	(2,706)	(6,763)
Segment operating income (loss)	(159)	(879)	(67)	(481)
Total assets (at end of period)	52,144	72,621	52,144	72,621
Capital expenditures	10	390	408	798
Depreciation and amortization	$ 619	$ 627	$ 1,242	$ 1,218

Income (loss) before interest expense and income taxes.

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- Definition

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 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.18)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 12
-Article 7

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- Definition

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
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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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
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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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.

+ References

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