Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	$ 143,483	$ 197,265	$ 445,199	$ 614,797
Inter-segment revenue	0	0	0	0
Segment operating income (loss)	21,488	46,818	64,655	137,428
Total assets (at end of period)	562,138	635,105	562,138	635,105	$ 625,258
Capital expenditures	2,438	5,966	7,740	18,276
Depreciation and amortization	6,724	6,910	20,322	20,406
Operating Segments [Member] | Reservoir Description [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	100,267	117,943	304,778	358,613
Inter-segment revenue	761	1,770	3,054	6,957
Segment operating income (loss)	20,395	30,338	57,824	89,812
Total assets (at end of period)	308,739	334,892	308,739	334,892
Capital expenditures	2,012	5,224	6,352	13,958
Depreciation and amortization	4,455	4,287	13,345	12,302
Operating Segments [Member] | Production Enhancement [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	37,552	64,918	120,846	210,652
Inter-segment revenue	179	140	563	1,509
Segment operating income (loss)	1,121	11,367	6,017	35,666
Total assets (at end of period)	187,846	210,209	187,846	210,209
Capital expenditures	318	309	856	2,821
Depreciation and amortization	1,294	1,614	4,062	5,024
Operating Segments [Member] | Reservoir Management [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	5,664	14,404	19,575	45,532
Inter-segment revenue	36	37	65	244
Segment operating income (loss)	(125)	4,796	784	12,114
Total assets (at end of period)	16,116	24,320	16,116	24,320
Capital expenditures	8	7	24	273
Depreciation and amortization	327	401	1,025	1,254
Corporate & Other [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	0	0	0	0
Inter-segment revenue	(976)	(1,947)	(3,682)	(8,710)
Segment operating income (loss)	97	317	30	(164)
Total assets (at end of period)	49,437	65,684	49,437	65,684
Capital expenditures	100	426	508	1,224
Depreciation and amortization	$ 648	$ 608	$ 1,890	$ 1,826