CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue
Construction	$ 269,243	$ 226,849
Large Project Construction	248,414	207,033
Construction Materials	45,722	34,518
Total revenue	563,379	468,400
Cost of revenue
Construction	230,847	199,520
Large Project Construction	228,048	204,478
Construction Materials	48,201	39,276
Total cost of revenue	507,096	443,274
Gross profit	56,283	25,126
Selling, general and administrative expenses	61,252	61,837
Acquisition and integration expenses	8,409
Gain on sales of property and equipment	(543)	(270)
Operating loss	(12,835)	(36,441)
Other expense (income)
Interest income	(1,521)	(1,051)
Interest expense	2,435	2,743
Equity in income of affiliates	(224)	(916)
Other expense (income), net	268	(870)
Total other expense (income)	958	(94)
Loss before benefit from income taxes	(13,793)	(36,347)
Benefit from income taxes	(4,131)	(12,496)
Net loss	(9,662)	(23,851)
Amount attributable to non-controlling interests	(1,761)	61
Net loss attributable to Granite Construction Incorporated	$ (11,423)	$ (23,790)
Net loss per share attributable to common shareholders (see Note 14)
Basic	$ (0.29)	$ (0.60)
Diluted	$ (0.29)	$ (0.60)
Weighted average shares of common stock
Basic	39,908	39,649
Diluted	39,908	39,649
Dividends per common share	$ 0.13	$ 0.13