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Acquisition (Details 1) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Contract revenues	$ 399,537	$ 399,015	$ 1,166,273	$ 1,119,375
Net income	8,373	6,952	24,986	11,724
Net income attributable to MYR Group, Inc.	$ 8,373	$ 6,952	$ 24,268	$ 10,898
Income per common share:
—Basic	$ 0.51	$ 0.43	$ 1.48	$ 0.67
—Diluted	$ 0.50	$ 0.42	$ 1.46	$ 0.66
Weighted average number of common shares and potential common shares outstanding:
—Basic	16,492	16,314	16,423	16,263
—Diluted	16,630	16,474	16,580	16,476

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