Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	$ 153,647	$ 213,643
Inter-segment revenue	0	0
Segment operating income (loss)	22,940	42,717
Total assets (at end of period)	587,250	630,008	$ 625,258
Capital expenditures	2,858	6,869
Depreciation and amortization	6,847	6,566
Operating Segments [Member] \| Reservoir Description [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	101,549	121,759
Inter-segment revenue	1,907	2,776
Segment operating income (loss)	18,220	28,530
Total assets (at end of period)	316,705	312,129
Capital expenditures	2,074	4,437
Depreciation and amortization	4,436	3,783
Operating Segments [Member] \| Production Enhancement [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	44,145	75,145
Inter-segment revenue	220	717
Segment operating income (loss)	4,141	9,923
Total assets (at end of period)	202,470	233,414
Capital expenditures	378	1,803
Depreciation and amortization	1,425	1,761
Operating Segments [Member] \| Reservoir Management [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	7,953	16,739
Inter-segment revenue	5	149
Segment operating income (loss)	487	3,866
Total assets (at end of period)	19,282	29,505
Capital expenditures	8	221
Depreciation and amortization	363	431
Corporate & Other [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	0	0
Inter-segment revenue	(2,132)	(3,642)
Segment operating income (loss)	92	398
Total assets (at end of period)	48,793	54,960
Capital expenditures	398	408
Depreciation and amortization	$ 623	$ 591

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585

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- Definition

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

No definition available.

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