Segment Reporting Level 4 (Details) (USD $) In Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Segment Reporting Information [Line Items]
TOTAL ASSETS	$ 552,233	$ 652,661	$ 552,233	$ 652,661	$ 636,042
Capital expenditures	7,605	6,541	11,984	12,696
Depreciation and amortization	5,805	5,766	11,636	11,520
Total Revenue	225,785	198,902	432,518	387,239
Segment Reporting Information, Intersegment Revenue	0	0	0	0
OPERATING INCOME	57,803	53,720	114,302	105,133
Operating Segment Reservoir Description [Member]
Segment Reporting Information [Line Items]
TOTAL ASSETS	272,298	258,759	272,298	258,759
Capital expenditures	4,079	4,600	7,382	9,929
Depreciation and amortization	3,517	3,523	6,999	7,030
Total Revenue	118,758	106,528	226,379	210,621
Segment Reporting Information, Intersegment Revenue	447	248	816	548
OPERATING INCOME	26,629	25,074	53,067	50,215
Operating Segment Production Enhancement [Member]
Segment Reporting Information [Line Items]
TOTAL ASSETS	208,114	190,512	208,114	190,512
Capital expenditures	2,499	720	3,303	1,392
Depreciation and amortization	1,578	1,626	3,217	3,249
Total Revenue	88,787	79,717	170,885	148,561
Segment Reporting Information, Intersegment Revenue	357	419	665	713
OPERATING INCOME	24,500	26,152	47,762	47,095
Operating Segment Reservoir Management [Member]
Segment Reporting Information [Line Items]
TOTAL ASSETS	19,146	14,245	19,146	14,245
Capital expenditures	284	219	391	257
Depreciation and amortization	169	166	349	324
Total Revenue	18,240	12,657	35,254	28,057
Segment Reporting Information, Intersegment Revenue	595	427	954	715
OPERATING INCOME	7,307	3,672	13,971	9,292
Operating Segment Corporate And Other [Member]
Segment Reporting Information [Line Items]
TOTAL ASSETS	52,675	189,145	52,675	189,145
Capital expenditures	743	1,002	908	1,118
Depreciation and amortization	541	451	1,071	917
Total Revenue	0	0	0	0
Segment Reporting Information, Intersegment Revenue	(1,399)	(1,094)	(2,435)	(1,976)
OPERATING INCOME	$ (633)	$ (1,178)	$ (498)	$ (1,469)

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+ References

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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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-SubTopic 10
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Amount of revenue from transactions with other operating segments of the same entity.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
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