Note 14—Reportable Segments

Through the end of the year 2016, we segregated our business into three reportable segments: the Energy segment, the East Construction Services segment and the West Construction Services segment. In the first quarter 2017, we changed our reportable segments in connection with a realignment of our internal organization and management structure. The segment changes reflect the focus of our CODM on the range of services we provide to our end user markets. Our CODM regularly reviews our operating and financial performance based on these segments.

The current reportable segments include the Power segment, the Pipeline segment, the Utilities segment, and the Civil segment. Segment information for prior periods has been restated to conform to the new segment presentation.

Each of our reportable segments is comprised of similar business units that specialize in services unique to the segment. Driving the new end-user focused segments are differences in the economic characteristics of each segment, the nature of the services provided by each segment; the production processes of each segment; the type or class of customer using the segment’s services; the methods used by the segment to provide the services; and the regulatory environment of each segment’s customers.

The classification of revenues and gross profit for segment reporting purposes can at times require judgment on the part of management. Our segments may perform services across industries or perform joint services for customers in multiple industries. To determine reportable segment gross profit, certain allocations, including allocations of shared and indirect costs, such as facility costs, equipment costs and indirect operating expenses were made.

The following is a brief description of the reportable segments:

The Power segment operates throughout the United States and specializes in a range of services that include full EPC project delivery, turnkey construction, retrofits, upgrades, repairs, outages, and maintenance for entities in the petroleum, petrochemical, water, and other industries.

The Pipeline segment operates throughout the United States and specializes in a range of services, including pipeline construction, pipeline maintenance, pipeline facility work, compressor stations, pump stations, metering facilities, and other pipeline related services for entities in the petroleum and petrochemical industries.

The Utilities segment operates primarily in California, the Midwest, and the Southeast regions of the United States and specializes in a range of services, including utility line installation and maintenance, gas and electric distribution, streetlight construction, substation work, and fiber optic cable installation.

The Civil segment operates primarily in the Southeastern and Gulf Coast regions of the United States and specializes in highway and bridge construction, airport runway and taxiway construction, demolition, heavy earthwork, soil stabilization, mass excavation, and drainage projects.

All intersegment revenues and gross profit, which were immaterial, have been eliminated in the following tables.

Segment Revenues

Revenue by segment for the years ended December 31, 2017, 2016 and 2015 was as follows (in thousands):


	2017			2016			2015
			% of			% of			% of
			Total			Total			Total
Segment	Revenue		Revenue	Revenue		Revenue	Revenue		Revenue
Power	$	606,125	25.5%	$	478,653	24.0%	$	466,292	24.2%
Pipeline		465,570	19.5%		401,931	20.1%		299,365	15.5%
Utilities		806,523	33.9%		637,212	31.9%		587,047	30.4%
Civil		501,777	21.1%		479,152	24.0%		576,711	29.9%
Total	$	2,379,995	100.0%	$	1,996,948	100.0%	$	1,929,415	100.0%

Segment Gross Profit

Gross profit by segment for the years ended December 31, 2017, 2016 and 2015 was as follows (in thousands):


	2017			2016			2015
			% of			% of			% of
			Segment			Segment
Segment	Gross Profit		Revenue	Gross Profit		Revenue	Gross Profit		Revenue
Power	$	65,675	10.8%	$	49,807	10.4%	$	53,620	11.5%
Pipeline		92,087	19.8%		68,100	16.9%		24,685	8.2%
Utilities		113,037	14.0%		100,071	15.7%		96,450	16.4%
Civil		7,635	1.5%		(16,671)	(3.5%)		45,118	7.8%
Total	$	278,434	11.7%	$	201,307	10.1%	$	219,873	11.4%

Geographic Region — Revenues and Total Assets

The majority of our revenues are derived from customers in the United States with approximately 1% generated from sources outside of the United States. At December 31, 2017 and 2016, approximately 1% of total assets were located outside of the United States.