Earnings Per Share Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 3,166	$ 4,487	$ (16,661)	$ (4,200)
Earnings Per Share, Basic, Two Class Method [Abstract]
Net income (loss) attributable to Granite, Earnings per share, Basic	2,718	1,949	(19,264)	(9,824)
Participating Securities, Distributed and Undistributed Earnings	0	10	0	0
Net Income (Loss) Available to Common Stockholders, Basic	2,718	1,939	(19,264)	(9,824)
Weighted Average Number of Shares Outstanding, Basic	38,829	38,471	38,720	38,368
Earnings (Loss) Per Share, Basic	$ 0.07	$ 0.05	$ (0.50)	$ (0.26)
Earnings Per Share, Diluted, Two Class Method [Abstract]
Net income (loss) attributable to Granite, Earnings per share, Diluted	2,718	1,949	(19,264)	(9,824)
Undistributed Earnings Allocated to Participating Securities	0	10	0	0
Net Income (Loss) Available to Common Stockholders, Diluted	$ 2,718	$ 1,939	$ (19,264)	$ (9,824)
Weighted Average Number of Shares Outstanding, Diluted	39,769	39,151	38,720	38,368
Earnings (Loss) Per Share, Diluted	$ 0.07	$ 0.05	$ (0.50)	$ (0.26)

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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