CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue
Construction	$ 429,269	$ 331,346	$ 656,118	$ 540,833
Large Project Construction	254,463	197,322	461,496	392,771
Construction Materials	79,181	75,911	113,699	110,427
Total revenue	762,913	604,579	1,231,313	1,044,031
Cost of revenue
Construction	366,765	282,290	565,665	464,844
Large Project Construction	253,968	183,668	458,446	365,612
Construction Materials	67,610	65,420	107,506	101,129
Total cost of revenue	688,343	531,378	1,131,617	931,585
Gross profit	74,570	73,201	99,696	112,446
Selling, general and administrative expenses	51,388	48,705	113,225	104,838
Gain on sales of property and equipment	(807)	(1,366)	(1,077)	(1,966)
Operating income (loss)	23,989	25,862	(12,452)	9,574
Other (income) expense
Interest income	(1,164)	(798)	(2,215)	(1,634)
Interest expense	2,694	3,187	5,437	6,236
Equity in income of affiliates	(1,259)	(717)	(2,175)	(2,159)
Other income, net	(642)	(3,183)	(1,512)	(4,555)
Total other income	(371)	(1,511)	(465)	(2,112)
Income (loss) before provision for (benefit from) income taxes	24,360	27,373	(11,987)	11,686
Provision for (benefit from) income taxes	8,088	8,847	(4,408)	2,923
Net income (loss)	16,272	18,526	(7,579)	8,763
Amount attributable to non-controlling interests	2,139	4,327	2,078	5,005
Net income (loss) attributable to Granite Construction Incorporated	$ 14,133	$ 14,199	$ (9,657)	$ 3,758
Net income (loss) per share attributable to common shareholders (see Note 11)
Basic (in dollars per share)	$ 0.35	$ 0.36	$ (0.24)	$ 0.10
Diluted (in dollars per share)	$ 0.35	$ 0.35	$ (0.24)	$ 0.09
Weighted average shares of common stock
Weighted average common shares outstanding, basic	39,827	39,584	39,738	39,509
Weighted average common shares outstanding, diluted	40,393	40,302	39,738	40,140
Dividends per common share (in US$ per share)	$ 0.13	$ 0.13	$ 0.26	$ 0.26