SEGMENT REPORTING

We operate our business in two reportable segments. These complementary segments provide different services and products and utilize different technologies for improving reservoir performance and increasing oil and gas recovery from new and existing fields.

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Reservoir Description: Encompasses the characterization of petroleum reservoir rock, fluid and gas samples to increase production and improve recovery of oil and gas from our clients' reservoirs. We provide laboratory based analytical and field services to characterize properties of crude oil and petroleum products to the oil and gas industry. We also provide proprietary and joint industry studies based on these types of analysis.


•	Production Enhancement: Includes services and products relating to reservoir well completions, perforations, stimulations and production. We provide integrated diagnostic services to evaluate and monitor the effectiveness of well completions and to develop solutions aimed at increasing the effectiveness of enhanced oil recovery projects.

Results for these segments are presented below. We use the same accounting policies to prepare our segment results as are used to prepare our Consolidated Financial Statements. All interest and other non-operating income (expense) is attributable to Corporate & Other and is not allocated to specific segments. Summarized financial information concerning our segments is shown in the following table (in thousands):



	Reservoir Description		Production Enhancement		Corporate & Other ¹			Consolidated
Three Months Ended September 30, 2018
Revenue from unaffiliated clients	$	103,609	$	78,537	$	—		$	182,146
Inter-segment revenue	58		141		(199		)	—
Segment operating income	14,956		19,243		680			34,879
Total assets (at end of period)	321,025		276,345		69,227			666,597
Capital expenditures	2,437		1,680		31			4,148
Depreciation and amortization	4,138		1,037		505			5,680
Three Months Ended September 30, 2017
Revenue from unaffiliated clients	$	101,442	$	61,445	$	—		$	162,887
Inter-segment revenue	54		87		(141		)	—
Segment operating income (loss)	14,621		12,165		(117		)	26,669
Total assets (at end of period)	315,346		203,413		63,985			582,744
Capital expenditures	2,930		1,605		367			4,902
Depreciation and amortization	4,383		1,092		518			5,993

Nine Months Ended September 30, 2018
Revenue from unaffiliated clients	$	306,525	$	221,114	$	—		$	527,639
Inter-segment revenue	178		293		(471		)	—
Segment operating income	44,473		55,357		814			100,644
Total assets	321,025		276,345		69,227			666,597
Capital expenditures	10,002		5,465		596			16,063
Depreciation and amortization	12,675		3,045		1,646			17,366
Nine Months Ended September 30, 2017
Revenue from unaffiliated clients	$	310,650	$	167,058	$	—		$	477,708
Inter-segment revenue	275		537		(812		)	—
Segment operating income (loss)²	49,231		28,633		(301		)	77,563
Total assets	315,346		203,413		63,985			582,744
Capital expenditures	7,605		5,394		1,265			14,264
Depreciation and amortization	13,531		3,398		1,557			18,486

(1) "Corporate & Other" represents those items that are not directly related to a particular segment, eliminations and the assets and liabilities of discontinued operations.

(2) Reclassification of $682,000 from Corporate & Other to Production Enhancement related to general and administrative overhead costs of discontinued operations.