Quarterly Financial Data - Unaudited (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Data

QUARTERLY FINANCIAL DATA
(unaudited - dollars in thousands, except per share data)
2018 Quarters Ended	December 31,			September 30,			June 30,			March 31,
Revenue	$	892,325		$	1,055,591		$	807,119		$	563,379
Gross profit		108,049			144,491			80,369			56,283
As a percent of revenue		12.1	%		13.7	%		10.0	%		10.0	%
Net income (loss)	$	10,387		$	59,097		$	(6,081	)	$	(9,662	)
As a percent of revenue		1.2	%		5.6	%		(0.8	)%		(1.7	)%
Net income (loss) attributable to Granite	$	6,546		$	55,672		$	(8,385	)	$	(11,423	)
As a percent of revenue		0.7	%		5.3	%		(1.0	)%		(2.0	)%
Net income (loss) per share attributable to common shareholders:
Basic	$	0.14		$	1.20		$	(0.20	)	$	(0.29	)
Diluted	$	0.14		$	1.17		$	(0.20	)	$	(0.29	)

2017 Quarters Ended	December 31,			September 30,			June 30,			March 31,
Revenue	$	801,274		$	957,126		$	762,913		$	468,400
Gross profit		100,707			114,530			74,570			25,126
As a percent of revenue		12.6	%		12.0	%		9.8	%		5.4	%
Net income (loss)	$	35,325		$	48,055		$	16,272		$	(23,851	)
As a percent of revenue		4.4	%		5.0	%		2.1	%		(5.1	)%
Net income (loss) attributable to Granite	$	32,773		$	45,982		$	14,133		$	(23,790	)
As a percent of revenue		4.1	%		4.8	%		1.9	%		(5.1	)%
Net income (loss) per share attributable to common shareholders:
Basic	$	0.82		$	1.15		$	0.35		$	(0.60	)
Diluted	$	0.81		$	1.14		$	0.35		$	(0.60	)