Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	$ 197,265	$ 276,135	$ 614,797	$ 806,600
Inter-segment revenue	0	0	0	0
Segment operating income (loss)	46,818	89,120	137,428	256,081
Total assets (at end of period)	635,105	685,132	635,105	685,132	$ 675,653
Capital expenditures	5,966	7,837	18,276	27,624
Depreciation and amortization	6,910	6,845	20,406	19,796
Operating Segments [Member] | Reservoir Description [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	117,943	131,380	358,613	387,225
Inter-segment revenue	1,770	4,734	6,957	10,266
Segment operating income (loss)	30,338	35,377	89,812	106,571
Total assets (at end of period)	334,892	317,741	334,892	317,741
Capital expenditures	5,224	4,577	13,958	15,673
Depreciation and amortization	4,287	4,158	12,302	11,941
Operating Segments [Member] | Production Enhancement [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	64,918	122,161	210,652	343,434
Inter-segment revenue	140	52,916	1,509	54,097
Segment operating income (loss)	11,367	45,735	35,666	120,597
Total assets (at end of period)	210,209	277,320	210,209	277,320
Capital expenditures	309	2,678	2,821	5,508
Depreciation and amortization	1,614	1,830	5,024	5,605
Operating Segments [Member] | Reservoir Management [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	14,404	22,594	45,532	75,941
Inter-segment revenue	37	1,422	244	2,189
Segment operating income (loss)	4,796	7,553	12,114	27,821
Total assets (at end of period)	24,320	33,646	24,320	33,646
Capital expenditures	7	2,021	273	2,388
Depreciation and amortization	401	350	1,254	955
Corporate & Other [Member]
Segment Reporting Information [Line Items]
Revenue from unaffiliated clients	0	0	0	0
Inter-segment revenue	(1,947)	(59,072)	(8,710)	(66,552)
Segment operating income (loss)	317	455	(164)	1,092
Total assets (at end of period)	65,684	56,425	65,684	56,425
Capital expenditures	426	(1,439)	1,224	4,055
Depreciation and amortization	$ 608	$ 507	$ 1,826	$ 1,295