Segment Reporting (Details) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| segment			2
Revenue	$ 169,038	$ 175,475	$ 338,232	$ 345,493
Segment operating income	28,008	33,449	44,422	65,765
Total assets (at end of period)	781,518	604,744	781,518	604,744	$ 648,827
Capital expenditures	7,047	7,472	12,230	11,915
Depreciation and amortization	5,786	5,868	11,373	11,686
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Reservoir Description [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	105,649	102,107	208,941	202,916
Segment operating income	15,878	14,760	22,057	29,517
Total assets (at end of period)	342,843	319,122	342,843	319,122
Capital expenditures	2,744	5,384	4,646	7,565
Depreciation and amortization	3,834	4,290	7,821	8,537
Reservoir Description [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	151	73	247	120
Production Enhancement [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	63,389	73,368	129,291	142,577
Segment operating income	10,424	18,427	20,336	36,114
Total assets (at end of period)	290,967	218,011	290,967	218,011
Capital expenditures	4,281	1,938	7,132	3,785
Depreciation and amortization	1,544	1,006	2,727	2,008
Production Enhancement [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	176	101	220	152
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Revenue	0	0
Segment operating income	1,706	262	2,029	134
Total assets (at end of period)	147,708	67,611	147,708	67,611
Capital expenditures	22	150	452	565
Depreciation and amortization	408	572	825	1,141
Corporate and Other [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	$ (327)	$ (174)	$ (467)	$ (272)

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.

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