Reportable Segments (Tables)

12 Months Ended

Dec. 31, 2017

Reportable Segments

Schedule of revenue by segment

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%

Schedule of gross profit by segment

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%