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Significant Accounting Policies (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Use of and Changes in Estimates |  |  |  |
Income from construction operations | $ 65,443,000 | $ 39,474,000 | $ 106,940,000 | $ 75,553,000
Net income | 28,545,000 | 15,478,000 | 44,484,000 | 30,278,000
Diluted earnings per common share (in dollars per share) | $ 0.58 | $ 0.32 | $ 0.91 | $ 0.62
Increase decrease in the estimated recovery projected for two projects |  |  |  |
Use of and Changes in Estimates |  |  |  |
Number of projects impacted by change in the estimated recoveries | 2 |  |  |
Favorable increase in results of operations | 24,200,000 |  |  |
Unfavorable decrease in results of operations | 9,400,000 |  |  |
Income from construction operations | 14,800,000 |  | 14,800,000 |
Net income | $ 8,800,000 |  | $ 8,800,000 |
Diluted earnings per common share (in dollars per share) | $ 0.18 |  | $ 0.18 |

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