CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue
Construction	$ 579,146	$ 464,624	$ 1,235,264	$ 1,005,457
Large Project Construction	279,845	249,345	741,341	642,116
Construction Materials	98,135	89,936	211,834	200,363
Total revenue	957,126	803,905	2,188,439	1,847,936
Cost of revenue
Construction	487,798	393,094	1,053,463	857,938
Large Project Construction	273,460	225,826	731,906	591,438
Construction Materials	81,338	77,311	188,844	178,440
Total cost of revenue	842,596	696,231	1,974,213	1,627,816
Gross profit	114,530	107,674	214,226	220,120
Selling, general and administrative expenses	49,501	54,194	162,726	159,032
Gain on sales of property and equipment	(1,753)	(398)	(2,830)	(2,364)
Operating income	66,782	53,878	54,330	63,452
Other (income) expense
Interest income	(1,141)	(790)	(3,356)	(2,424)
Interest expense	2,660	3,034	8,097	9,270
Equity in income of affiliates	(2,732)	(2,424)	(4,907)	(4,583)
Other income, net	(1,309)	(732)	(2,821)	(5,287)
Total other income	(2,522)	(912)	(2,987)	(3,024)
Income before provision for income taxes	69,304	54,790	57,317	66,476
Provision for income taxes	21,249	16,617	16,841	19,540
Net income	48,055	38,173	40,476	46,936
Amount attributable to non-controlling interests	2,073	982	4,151	5,987
Net income attributable to Granite Construction Incorporated	$ 45,982	$ 37,191	$ 36,325	$ 40,949
Net income per share attributable to common shareholders (see Note 11)
Basic (in dollars per share)	$ 1.15	$ 0.94	$ 0.91	$ 1.04
Diluted (in dollars per share)	$ 1.14	$ 0.92	$ 0.90	$ 1.02
Weighted average shares of common stock
Weighted average common shares outstanding, basic	39,844	39,599	39,774	39,539
Weighted average common shares outstanding, diluted	40,387	40,313	40,367	40,205
Dividends per common share (in US$ per share)	$ 0.13	$ 0.13	$ 0.39	$ 0.39