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Selected Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Selected Quarterly Financial Information |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 579,017 | $ 608,311 | $ 631,165 | $ 561,502 | $ 601,863 | $ 507,828 | $ 456,811 | $ 430,446 | $ 2,379,995 | $ 1,996,948 | $ 1,929,415
Gross Profit | 68,477 | 70,421 | 84,483 | 55,053 | 68,616 | 50,129 | 43,285 | 39,277 | 278,434 | 201,307 | 219,873
Impairment of goodwill |  |  |  |  |  | 2,716 |  |  | 0 | 2,716 | 401
Net income | 23,808 | 22,134 | 22,396 | 8,512 | 14,766 | 4,756 | 5,287 | 2,916 | 76,850 | 27,725 | 37,151
Net income attributable to Primoris | $ 22,521 | $ 20,597 | $ 21,545 | $ 7,691 | $ 14,470 | $ 4,504 | $ 5,056 | $ 2,693 | $ 72,354 | $ 26,723 | $ 36,872
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share (in dollars per share) | $ 0.44 | $ 0.40 | $ 0.42 | $ 0.15 | $ 0.28 | $ 0.09 | $ 0.10 | $ 0.05 | $ 1.41 | $ 0.52 | $ 0.71
Diluted earnings per share (in dollars per share) | $ 0.44 | $ 0.40 | $ 0.42 | $ 0.15 | $ 0.28 | $ 0.09 | $ 0.10 | $ 0.05 | $ 1.40 | $ 0.51 | $ 0.71
Weighted average common shares outstanding: |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 51,449 | 51,441 | 51,437 | 51,594 | 51,771 | 51,780 | 51,772 | 51,725 | 51,481 | 51,762 | 51,647
Diluted (in shares) | 51,711 | 51,707 | 51,688 | 51,851 | 52,021 | 52,034 | 52,022 | 51,881 | 51,741 | 51,989 | 51,798

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