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Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 17,932 | $ 17,948 | $ 11,857 | $ 10,530 |  |  |  |  | $ 58,267 | $ 58,559 | $ 33,616
Net income attributable to non-controlling interests |  |  |  |  |  |  |  |  | (1,511) |  |
Net income attributable to Primoris | $ 17,021 | $ 17,516 | $ 11,733 | $ 10,486 | $ 12,471 | $ 19,348 | $ 14,462 | $ 12,278 | $ 56,756 | $ 58,559 | $ 33,616
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted average shares for computation of basic earnings per share | 51,404 | 51,398 | 51,435 | 51,096 | 51,059 | 51,054 | 51,044 | 49,675 | 51,391 | 50,707 | 42,694
Dilutive effect of warrants and units (in shares) |  |  |  |  |  |  |  |  |  | 51 | 908
Dilutive effect of contingently issuable shares |  |  |  |  |  |  |  |  |  | 386 | 989
Dilutive effect of shares issued to independent directors |  |  |  |  |  |  |  |  | 11 | 9 |
Dilutive effect of JCG convertible preferred shares |  |  |  |  |  |  |  |  |  |  | 2,287
Dilutive effect of shares to be issued to Q3C sellers |  |  |  |  |  |  |  |  | 4 |  |
Weighted average shares for computation of diluted earnings per share | 51,418 | 51,404 | 51,435 | 51,337 | 51,292 | 51,054 | 51,154 | 51,051 | 51,406 | 51,153 | 46,878
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share (in dollars per share) | $ 0.33 | $ 0.34 | $ 0.23 | $ 0.21 | $ 0.24 | $ 0.38 | $ 0.28 | $ 0.25 | $ 1.10 | $ 1.15 | $ 0.79
Diluted earnings per share (in dollars per share) | $ 0.33 | $ 0.34 | $ 0.23 | $ 0.20 | $ 0.24 | $ 0.38 | $ 0.28 | $ 0.24 | $ 1.10 | $ 1.14 | $ 0.72

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