Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands		Total	Common Stock		Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Total Granite Shareholders’ Equity	Non-controlling Interests	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjustment Additional Paid-In Capital	Cumulative Effect, Period of Adoption, Adjustment Retained Earnings	Cumulative Effect, Period of Adoption, Adjustment Total Granite Shareholders’ Equity	Cumulative Effect, Period of Adoption, Adjusted Balance	Cumulative Effect, Period of Adoption, Adjusted Balance Common Stock	Cumulative Effect, Period of Adoption, Adjusted Balance Additional Paid-In Capital	Cumulative Effect, Period of Adoption, Adjusted Balance Accumulated Other Comprehensive Income (Loss)	Cumulative Effect, Period of Adoption, Adjusted Balance Retained Earnings	Cumulative Effect, Period of Adoption, Adjusted Balance Total Granite Shareholders’ Equity	Cumulative Effect, Period of Adoption, Adjusted Balance Non-controlling Interests
Beginning balances (in shares) at Dec. 31, 2021			45,840,260												45,840,260
Beginning balances at Dec. 31, 2021		$ 995,563	$ 458		$ 559,752	$ (3,359)	$ 410,831	$ 967,682	$ 27,881	$ (16,418)	$ (26,961)	$ 10,543	$ (16,418)	$ 979,145	$ 458	$ 532,791	$ (3,359)	$ 421,374	$ 951,264	$ 27,881
Net income (loss)		(5,517)					(8,052)	(8,052)	2,535
Other comprehensive income		$ 5,747				5,747		5,747
Repurchases of common stock (shares)		(1,931,568)	(1,991,586)	[1]
Repurchase of common stock	[1]	$ (70,376)	$ (19)		(70,357)			(70,376)
Restricted stock units ("RSUs") vested (shares)			220,766
Restricted stock units (“RSUs”) vested		0	$ 2		(2)
Dividends on common stock		(11,587)			144		(11,731)	(11,587)
Transactions with non-controlling interests		2,900							2,900
Stock-based compensation expense and other (in shares)			9,029
Stock-based compensation expense and other		4,659			4,583		76	4,659
Ending balances (in shares) at Jun. 30, 2022			44,078,469
Ending balances at Jun. 30, 2022		904,971	$ 441		467,159	2,388	401,667	871,655	33,316
Beginning balances (in shares) at Mar. 31, 2022			45,364,137
Beginning balances at Mar. 31, 2022		941,889	$ 454		515,262	1,573	388,756	906,045	35,844
Net income (loss)		19,578					18,681	18,681	897
Other comprehensive income		$ 815				815		815
Repurchases of common stock (shares)		(1,320,568)	(1,325,706)	[2]
Repurchase of common stock	[2]	$ (50,164)	$ (13)		(50,151)			(50,164)
Restricted stock units ("RSUs") vested (shares)			30,596
Dividends on common stock		(5,771)			75		(5,846)	(5,771)
Transactions with non-controlling interests		(3,425)							(3,425)
Stock-based compensation expense and other (in shares)			9,442
Stock-based compensation expense and other		2,049			1,973		76	2,049
Ending balances (in shares) at Jun. 30, 2022			44,078,469
Ending balances at Jun. 30, 2022		$ 904,971	$ 441		467,159	2,388	401,667	871,655	33,316
Beginning balances (in shares) at Dec. 31, 2022		43,743,907	43,743,907
Beginning balances at Dec. 31, 2022		$ 985,145	$ 437		470,407	788	481,384	953,016	32,129
Net income (loss)		(49,618)					(40,023)	(40,023)	(9,595)
Other comprehensive income		7				7		7
Repurchases of common stock (shares)	[1]		(93,602)
Repurchase of common stock	[1]	(3,767)	$ (1)		(3,766)			(3,767)
Restricted stock units ("RSUs") vested (shares)			261,362
Restricted stock units (“RSUs”) vested		0	$ 3		(3)
Dividends on common stock		(11,414)			150		(11,564)	(11,414)
Capped call transactions		(39,379)			(39,379)			(39,379)
Redemption of warrants		(13,201)			(13,201)			(13,201)
Loss on debt extinguishment (in shares)			1,390,500
Loss on debt extinguishment		49,335	$ 14		49,321			49,335
Exercise of bond hedge (in shares)			(1,390,516)
Exercise of bond hedge			$ (14)		14
Transactions with non-controlling interests		17,374							17,374
Stock-based compensation expense and other (in shares)			7,147
Stock-based compensation expense and other		$ 6,968			6,968			6,968
Ending balances (in shares) at Jun. 30, 2023		43,918,798	43,918,798
Ending balances at Jun. 30, 2023		$ 941,450	$ 439		470,511	795	429,797	901,542	39,908
Beginning balances (in shares) at Mar. 31, 2023			43,880,224
Beginning balances at Mar. 31, 2023		972,411	$ 439		471,782	653	452,583	925,457	46,954
Net income (loss)		(23,846)					(17,000)	(17,000)	(6,846)
Other comprehensive income		142				142		142
Repurchases of common stock (shares)	[2]		(6,342)
Repurchase of common stock	[2]	(244)	$ (1)		(243)			(244)
Restricted stock units ("RSUs") vested (shares)			37,394
Restricted stock units (“RSUs”) vested		0	$ 1		(1)
Dividends on common stock		(5,710)			76		(5,786)	(5,710)
Capped call transactions		(39,379)			(39,379)			(39,379)
Redemption of warrants		(13,201)			(13,201)			(13,201)
Loss on debt extinguishment (in shares)			1,390,500
Loss on debt extinguishment		49,335	$ 14		49,321			49,335
Exercise of bond hedge (in shares)			(1,390,516)
Exercise of bond hedge		0	$ (14)		14
Transactions with non-controlling interests		(200)							(200)
Stock-based compensation expense and other (in shares)			7,538
Stock-based compensation expense and other		$ 2,142			2,142			2,142
Ending balances (in shares) at Jun. 30, 2023		43,918,798	43,918,798
Ending balances at Jun. 30, 2023		$ 941,450	$ 439		$ 470,511	$ 795	$ 429,797	$ 901,542	$ 39,908

[1] This amount represents employee tax withholding for restricted stock units ("RSUs") vested under our equity incentive plans in 2022 and 2023 and stock repurchased in 2022 under the Board approved repurchase plan. During the six months ended June 30, 2023 and 2022, there were 93,602 shares and 60,018 shares, respectively, withheld related to employee taxes for RSUs. During the six months ended June 30, 2022, we also repurchased 1,931,568 shares under the share repurchase program.

[2] This amount represents employee tax withholding for restricted stock units ("RSUs") vested under our equity incentive plans in 2022 and 2023 and stock repurchased in 2022 under the Board approved repurchase plan. During the three months ended June 30, 2023 and 2022, there were 6,342 shares and 5,138 shares, respectively, withheld related to employee taxes for RSUs. During the three months ended June 30, 2022, we also repurchased 1,320,568 shares under the share repurchase program.