| Schedule of Earnings Per Share Reconciliation [Table Text Block] |
The following is a reconciliation of net income (loss) attributable to Granite and related weighted average shares of common stock outstanding for purposes of calculating basic and diluted net income (loss) per share using the two-class method (in thousands, except per share amounts): | | | | | | | | | | | | | | | | | | | | Three Months Ended September 30, | | Nine Months Ended September 30, | (in thousands, except per share amounts) | | 2013 | | 2012 | | 2013 | | 2012 | Basic | | | | |
| | | | | Numerator: | | | | |
| | | | | Net income (loss) attributable to Granite | | $ | 10,997 |
| | $ | 37,121 |
| | $ | (8,267 | ) | | $ | 27,297 |
| Less: net income allocated to participating securities | | — |
| | 181 |
| | — |
| | 184 |
| Net income (loss) allocated to common shareholders for basic calculation | | $ | 10,997 |
| | $ | 36,940 |
| | $ | (8,267 | ) | | $ | 27,113 |
| | | | | | | | | | Denominator: | | | | |
| | | | | Weighted average common shares outstanding, basic | | 38,876 |
| | 38,518 |
| | 38,773 |
| | 38,418 |
| Net income (loss) per share, basic | | $ | 0.28 |
| | $ | 0.96 |
| | $ | (0.21 | ) | | $ | 0.71 |
| | | | | | | | | | Diluted | | | | |
| | | | | Numerator: | | | | |
| | | | | Net income (loss) attributable to Granite | | $ | 10,997 |
| | $ | 37,121 |
| | $ | (8,267 | ) | | $ | 27,297 |
| Less: net income allocated to participating securities | | — |
| | 178 |
| | — |
| | 181 |
| Net income (loss) allocated to common shareholders for diluted calculation | | $ | 10,997 |
| | $ | 36,943 |
| | $ | (8,267 | ) | | $ | 27,116 |
| | | | | | | | | | Denominator: | | | | |
| | | | | Weighted average common shares outstanding, diluted | | 39,759 |
| | 39,141 |
| | 38,773 |
| | 39,013 |
| Net income (loss) per share, diluted | | $ | 0.28 |
| | $ | 0.94 |
| | $ | (0.21 | ) | | $ | 0.70 |
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