Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Data

QUARTERLY FINANCIAL DATA
(unaudited - dollars in thousands, except per share data)
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	)

2016 Quarters Ended	December 31,			September 30,			June 30,			March 31,
Revenue	$	666,681		$	803,905		$	604,579		$	439,452
Gross profit	81,250			107,674			73,201			39,245
As a percent of revenue	12.2		%	13.4		%	12.1		%	8.9		%
Net income (loss)	$	19,264		$	38,172		$	18,526		$	(9,762	)
As a percent of revenue	2.9		%	4.7		%	3.1		%	(2.2		)%
Net income (loss) attributable to Granite	$	16,173		$	37,190		$	14,199		$	(10,440	)
As a percent of revenue	2.4		%	4.6		%	2.3		%	(2.4		)%
Net income (loss) per share attributable to common shareholders:
Basic	$	0.41		$	0.94		$	0.36		$	(0.27	)
Diluted	$	0.40		$	0.92		$	0.35		$	(0.27	)