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.

•

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 June 30, 2018
Revenue from unaffiliated clients	$	102,107	$	73,368	$	—		$	175,475
Inter-segment revenue	73		101		(174		)	—
Segment operating income	14,760		18,427		262			33,449
Total assets (at end of period)	319,122		218,011		67,611			604,744
Capital expenditures	5,384		1,938		150			7,472
Depreciation and amortization	4,290		1,006		572			5,868
Three Months Ended June 30, 2017
Revenue from unaffiliated clients	$	104,313	$	53,899	$	—		$	158,212
Inter-segment revenue	47		249		(296		)	—
Segment operating income (loss)	18,670		8,713		(28		)	27,355
Total assets (at end of period)	319,433		200,583		63,742			583,758
Capital expenditures	2,098		769		46			2,913
Depreciation and amortization	4,528		1,142		518			6,188

Six Months Ended June 30, 2018
Revenue from unaffiliated clients	$	202,916	$	142,577	$	—		$	345,493
Inter-segment revenue	120		152		(272		)	—
Segment operating income	29,517		36,114		134			65,765
Total assets	319,122		218,011		67,611			604,744
Capital expenditures	7,565		3,785		565			11,915
Depreciation and amortization	8,537		2,008		1,141			11,686
Six Months Ended June 30, 2017
Revenue from unaffiliated clients	$	209,208	$	105,613	$	—		$	314,821
Inter-segment revenue	221		450		(671		)	—
Segment operating income (loss)	34,610		17,150		(866		)	50,894
Total assets	319,433		200,583		63,742			583,758
Capital expenditures	4,675		3,789		898			9,362
Depreciation and amortization	9,148		2,306		1,039			12,493

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