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Significant Accounting Policies (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Change in Accounting Estimate [Line Items] |  |  |  |
Income from construction operations | $ 70,354,000 | $ 58,094,000 | $ 177,294,000 | $ 133,647,000
Net income | 35,730,000 | 23,759,000 | 80,214,000 | 54,037,000
Diluted earnings per common share (in dollars per share) | $ 0.73 | $ 0.49 | $ 1.64 | $ 1.11
Increases in the Estimated Recovery Projected for Building Segment Projects [Member] |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |
Favorable increase in results of operations | 14,100,000 |  |  |
Income from construction operations |  | 9,700,000 |  | 11,500,000
Net income |  | 6,200,000 |  | 7,200,000
Diluted earnings per common share (in dollars per share) |  | $ 0.13 |  | $ 0.15
Increases in Estimated Recovery Civil Segments Project [Member] |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |
Number of projects impacted by change in the estimated recoveries |  |  | 2 |
Favorable increase in results of operations |  |  | 25,900,000 |
Unfavorable decrease in results of operations |  |  | 9,400,000 |
Income from construction operations | 15,800,000 |  | 30,600,000 |
Net income | $ 9,500,000 |  | $ 18,300,000 |
Diluted earnings per common share (in dollars per share) | $ 0.19 |  | $ 0.37 |

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