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Business Combinations (Details 2) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Pro forma results |  |  |  |
Percentage of pro forma tax rate used in calculating taxes on income from continuing operations | 39.00% | 39.00% | 39.00% | 39.00%
Revenues | $ 483,545 | $ 537,753 | $ 879,323 | $ 1,022,277
Income before provision for income taxes | 6,032 | 27,563 | 6,971 | 43,605
Net income attributable to Primoris | $ 3,638 | $ 16,578 | $ 4,219 | $ 26,000
Weighted average common shares outstanding: |  |  |  |
Basic (in shares) | 51,666 | 51,655 | 51,619 | 51,631
Diluted (in shares) | 51,815 | 51,804 | 51,770 | 51,759
Earnings per share: |  |  |  |
Basic (in dollars per share) | $ 0.07 | $ 0.32 | $ 0.08 | $ 0.50
Diluted (in dollars per share) | $ 0.07 | $ 0.32 | $ 0.08 | $ 0.50

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