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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Segment Reporting (Details) $ in Thousands	3 Months Ended								12 Months Ended
Segment Reporting (Details) $ in Thousands	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| segment									2
Revenue	$ 173,207	$ 182,146	$ 175,475	$ 170,018	$ 170,111	$ 162,887	$ 158,212	$ 156,609	$ 700,846	$ 647,819	$ 590,232
Segment operating income (loss)									118,622	109,968	87,451
Assets	648,827				584,812				648,827	584,812	573,052
Capital expenditures									21,741	18,775	11,356
Depreciation and amortization									23,087	24,524	26,872
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Revenue									0	0	0
Segment operating income (loss)									736	(519)	100
Assets	62,492				57,854				62,492	57,854	61,147
Capital expenditures									690	1,550	838
Depreciation and amortization									2,069	2,117	2,522
Operating Segments [Member] \| Reservoir Description [Member]
Segment Reporting Information [Line Items]
Revenue									413,082	415,220	426,205
Segment operating income (loss)									54,847	66,500	78,881
Assets	315,503				320,569				315,503	320,569	316,801
Capital expenditures									12,829	10,406	8,220
Depreciation and amortization									16,747	17,972	18,494
Operating Segments [Member] \| Production Enhancement [Member]
Segment Reporting Information [Line Items]
Revenue									287,764	232,599	164,027
Segment operating income (loss)									63,039	43,987	8,470
Assets	$ 270,832				$ 206,389				270,832	206,389	195,104
Capital expenditures									8,222	6,819	2,298
Depreciation and amortization									4,271	4,435	5,856
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue									0	0	0
Intersegment Eliminations [Member] \| Reservoir Description [Member]
Segment Reporting Information [Line Items]
Revenue									988	294	784
Intersegment Eliminations [Member] \| Production Enhancement [Member]
Segment Reporting Information [Line Items]
Revenue									378	1,185	877
Intersegment Eliminations [Member] \| Corporate and Other [Member]
Segment Reporting Information [Line Items]
Revenue									$ (1,366)	$ (1,479)	$ (1,661)