SEGMENT REPORTING

We operate our business in two reporting 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: (1) Reservoir Description and (2) Production Enhancement. These business segments provide different services and products and utilize different technologies.

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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 analyses.


•	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 business segments are presented below. We use the same accounting policies to prepare our business segment results as are used to prepare our Consolidated Financial Statements. All interest and other non-operating income (expense) is attributable to Corporate & Other area and is not allocated to specific business segments. Summarized financial information concerning our segments for the years ended December 31, 2018, 2017 and 2016 is shown in the following table (in thousands):



	Reservoir Description		Production Enhancement		Corporate & Other (1)			Consolidated
December 31, 2018
Revenues from unaffiliated clients	$	413,082	$	287,764	$	—		$	700,846
Inter-segment revenues	988		378		(1,366		)	—
Segment operating income	54,847		63,039		736			118,622
Total assets (at end of period)	315,503		270,832		62,492			648,827
Capital expenditures	12,829		8,222		690			21,741
Depreciation and amortization	16,747		4,271		2,069			23,087

December 31, 2017
Revenues from unaffiliated clients	$	415,220	$	232,599	$	—		$	647,819
Inter-segment revenue	294		1,185		(1,479		)	—
Segment operating income (loss)	66,500		43,987		(519		)	109,968
Total assets (at end of period)	320,569		206,389		57,854			584,812
Capital expenditures	10,406		6,819		1,550			18,775
Depreciation and amortization	17,972		4,435		2,117			24,524




December 31, 2016
Revenue from unaffiliated clients	$	426,205	$	164,027	$	—		$	590,232
Inter-segment revenue	784		877		(1,661		)	—
Segment operating income	78,881		8,470		100			87,451
Total assets (at end of period)	316,801		195,104		61,147			573,052
Capital expenditures	8,220		2,298		838			11,356
Depreciation and amortization	18,494		5,856		2,522			26,872
(1) "Corporate and other" represents those items that are not directly relating to a particular segment and eliminations.

We are a Netherlands company and we derive our revenue from services and product sales to clients primarily in the oil and gas industry. No single client accounted for 10% or more of revenue in any of the periods presented.

We attribute service revenue to the country in which the service was performed rather than where the reservoir or project is located while we attribute product sales revenue to the country where the product was shipped as we feel this gives a clearer view of our operations. We do, however, have significant levels of service revenue performed and recorded in the U.S. that are sourced from projects on non-U.S. oilfields. The following table shows a summary of our U.S. and non-U.S. operations for the years ended or at December 31, 2018, 2017 and 2016 (in thousands):



GEOGRAPHIC INFORMATION	United States		Canada		Other Countries (1) (2)		Consolidated
December 31, 2018
Revenue	$	324,073	$	34,633	$	342,140	$	700,846
Property, plant and equipment, net	65,073		9,567		48,277		122,917

December 31, 2017
Revenue	$	283,969	$	30,131	$	333,719	$	647,819
Property, plant and equipment, net	63,812		9,725		49,561		123,098

December 31, 2016
Revenue	$	224,642	$	20,537	$	345,053	$	590,232
Property, plant and equipment, net	71,388		10,497		47,997		129,882
(1) Revenue earned in other countries, including the Netherlands, was not individually greater than 10% of our consolidated revenue in 2018, 2017 or 2016.
(2) Property, plant and equipment, net in other countries, including the Netherlands, were not individually greater than 10% of our consolidated fixed assets in 2018, 2017 or 2016.

The following table shows the breakdown between services and product sales for the years ended December 31, 2018, 2017 and 2016 (in thousands):



SEGMENT BREAKDOWN BETWEEN SERVICES / PRODUCT SALES
SEGMENT BREAKDOWN BETWEEN SERVICES / PRODUCT SALES	2018		2017		2016
Reservoir Description Services	$	387,098	$	393,742	$	400,034
Production Enhancement Services	99,722		86,522		68,354
Total Revenue - Services	$	486,820	$	480,264	$	468,388

Reservoir Description Product sales	$	25,984	$	21,478	$	26,171
Production Enhancement Product sales	188,042		146,077		95,673
Total Revenue - Product sales	$	214,026	$	167,555	$	121,844

Total Revenue	$	700,846	$	647,819	$	590,232