CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
CONDENSED CONSOLIDATED STATEMENTS OF INCOME
Revenue	$ 648,787	$ 631,165	$ 1,152,906	$ 1,192,667
Cost of revenue	577,368	546,682	1,036,927	1,053,131
Gross profit	71,419	84,483	115,979	139,536
Selling, general and administrative expenses	43,489	44,881	80,445	84,514
Acquisition and related costs	7,668	1,096	9,363	1,317
Operating income	20,262	38,506	26,171	53,705
Other income (expense):
Foreign exchange gain	1,256	109	1,513	132
Other income (expense), net	(771)	(13)	(783)	(13)
Interest income	340	114	612	183
Interest expense	(3,191)	(2,145)	(5,189)	(4,407)
Income before provision for income taxes	17,896	36,571	22,324	49,600
Provision for income taxes	(3,705)	(14,175)	(3,917)	(18,692)
Net income	14,191	22,396	18,407	30,908
Less net income attributable to noncontrolling interests	(2,476)	(851)	(6,004)	(1,672)
Net income attributable to Primoris	$ 11,715	$ 21,545	$ 12,403	$ 29,236
Dividends per common share (in dollars per share)	$ 0.060	$ 0.055	$ 0.120	$ 0.110
Earnings per share:
Basic (in dollars per share)	0.23	0.42	0.24	0.57
Diluted (in dollars per share)	$ 0.23	$ 0.42	$ 0.24	$ 0.56
Weighted average common shares outstanding:
Basic (in shares)	51,531	51,437	51,505	51,515
Diluted (in shares)	51,793	51,688	51,770	51,771