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Business Combinations (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 0 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Mar. 12, 2012 Sprint | Jun. 30, 2012 Sprint | Jun. 30, 2013 Sprint | Jun. 30, 2012 Sprint | Jan. 31, 2013 Q3 Contracting | Jun. 30, 2013 Q3 Contracting
Pro forma results |  |  |  |  |  |  |  |  |  |
Percentage of pro forma tax rate used in calculating taxes on income from continuing operations |  |  |  |  |  | 39.00% |  | 39.00% |  |
Unregistered shares of common stock issued with an acquisition |  |  |  |  | 62,052 |  | 62,052 |  | 29,273 | 29,273
Revenues | $ 445,013 | $ 357,368 | $ 857,807 | $ 675,783 |  |  |  |  |  |
Income before provision for income taxes | 25,883 | 16,583 | 42,015 | 31,158 |  |  |  |  |  |
Net income attributable to Primoris | $ 15,564 | $ 10,135 | $ 25,264 | $ 19,084 |  |  |  |  |  |
Weighted average common shares outstanding: |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 51,562 | 51,526 | 51,511 | 51,440 |  |  |  |  |  |
Diluted (in shares) | 51,626 | 51,526 | 51,575 | 51,440 |  |  |  |  |  |
Earnings per share attributable to Primoris: |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.30 | $ 0.20 | $ 0.49 | $ 0.37 |  |  |  |  |  |
Diluted (in dollars per share) | $ 0.30 | $ 0.20 | $ 0.49 | $ 0.37 |  |  |  |  |  |

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