Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue
Total revenue	$ 898,552	$ 849,247	$ 1,458,620	$ 1,503,133
Cost of revenue
Total cost of revenue	795,466	751,681	1,323,175	1,345,475
Gross profit	103,086	97,566	135,445	157,658
Selling, general and administrative expenses	64,563	60,121	137,685	130,241
Other costs, net	13,607	16,612	18,130	22,891
Gain on sales of property and equipment, net	(3,944)	(8,915)	(5,981)	(9,513)
Operating income (loss)	28,860	29,748	(14,389)	14,039
Other (income) expense
Loss on debt extinguishment	51,052	0	51,052	0
Interest income	(3,232)	(782)	(6,994)	(1,352)
Interest expense	4,131	3,899	7,022	7,484
Net income from affiliates	(7,044)	(4,876)	(12,231)	(6,165)
Other (income) expense, net	(1,225)	3,261	(3,175)	4,569
Total other expense, net	43,682	1,502	35,674	4,536
Income (loss) before income taxes	(14,822)	28,246	(50,063)	9,503
Provision for (benefit from) income taxes	9,024	8,668	(445)	15,020
Net income (loss)	(23,846)	19,578	(49,618)	(5,517)
Amount attributable to non-controlling interests	6,846	(897)	9,595	(2,535)
Net income (loss) attributable to Granite Construction Incorporated	$ (17,000)	$ 18,681	$ (40,023)	$ (8,052)
Net income (loss) per share attributable to common shareholders
Net loss per share, basic (USD per share)	$ (0.39)	$ 0.42	$ (0.91)	$ (0.18)
Net loss per share, diluted (USD per share)	$ (0.39)	$ 0.39	$ (0.91)	$ (0.18)
Weighted average shares outstanding:
Weighted average shares outstanding, basic (shares)	43,892,000	44,534,000	43,829,000	45,128,000
Weighted average shares outstanding, diluted (shares)	43,892,000	52,295,000	43,829,000	45,128,000
Construction
Revenue
Total revenue	$ 749,413	$ 713,221	$ 1,252,829	$ 1,291,487
Cost of revenue
Total cost of revenue	670,259	632,969	1,136,970	1,152,756
Materials
Revenue
Total revenue	149,139	136,026	205,791	211,646
Cost of revenue
Total cost of revenue	$ 125,207	$ 118,712	$ 186,205	$ 192,719