Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2011

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

This information has been prepared on the same basis as the audited consolidated financial statements and, in the opinion of management, contains all adjustments necessary for a fair statement thereof.

QUARTERLY FINANCIAL DATA
(unaudited - in thousands, except per share data)
2011 Quarters Ended	December 31,			September 30,			June 30,			March 31,
Revenue	$	539,548		$	728,578		$	484,674		$	256,731
Gross profit	79,126			93,893			44,956			29,988
As a percent of revenue	14.7		%	12.9		%	9.3		%	11.7		%
Net income (loss)	$	24,792		$	42,376		$	6,173		$	(7,256	)
As a percent of revenue	4.6		%	5.8		%	1.3		%	-2.8		%
Net income (loss) attributable to Granite	$	18,754		$	36,468		$	4,946		$	(9,007	)
As a percent of revenue	3.5		%	5.0		%	1.0		%	-3.5		%
Net income (loss) per share attributable to common shareholders:
Basic	$	0.48		$	0.94		$	0.13		$	(0.24	)
Diluted	$	0.48		$	0.93		$	0.13		$	(0.24	)

2010 Quarters Ended	December 31,			September 30,			June 30,			March 31,
Revenue	$	417,228		$	670,850		$	454,204		$	220,683
Gross profit	46,217			76,155			49,698			5,714
As a percent of revenue	11.1		%	11.4		%	10.9		%	2.6		%
Net (loss) income	$	(65,386	)	$	43,301		$	(2,633	)	$	(37,730	)
As a percent of revenue	-15.7		%	6.5		%	-0.6		%	-17.1		%
Net (loss) income attributable to Granite	$	(50,019	)	$	38,681		$	(6,691	)	$	(40,954	)
As a percent of revenue	-12.0		%	5.8		%	-1.5		%	-18.6		%
Net (loss) income per share attributable to common shareholders:
Basic	$	(1.32	)	$	1.00		$	(0.18	)	$	(1.09	)
Diluted	$	(1.32	)	$	0.99		$	(0.18	)	$	(1.09	)