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Unaudited Quarterly Financial Data (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) $ / shares | Sep. 30, 2016 USD ($) $ / shares | Jun. 30, 2016 USD ($) $ / shares | Mar. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares | Sep. 30, 2015 USD ($) $ / shares | Jun. 30, 2015 USD ($) $ / shares | Mar. 31, 2015 USD ($) $ / shares | Dec. 31, 2016 USD ($) segment $ / shares | Dec. 31, 2015 USD ($) $ / shares | Dec. 31, 2014 USD ($) $ / shares
Unaudited Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,246,599 | $ 1,332,978 | $ 1,308,130 | $ 1,085,369 | $ 1,200,830 | $ 1,340,739 | $ 1,312,438 | $ 1,066,465 | $ 4,973,076 | $ 4,920,472 | $ 4,492,309
Gross profit | 117,660 | 124,668 | 109,770 | 105,092 | 66,673 | 100,201 | 98,620 | 90,759 | 457,190 | 356,253 | 505,442
Income from construction operations | 52,050 | 60,919 | 48,829 | 40,122 | 15,474 | 38,974 | 30,881 | 20,084 | 201,920 | 105,413 | 241,690
Income before income taxes | 38,685 | 47,926 | 35,780 | 26,724 | 11,687 | 33,955 | 19,992 | 8,205 | 149,115 | 73,839 | 187,438
Net income | $ 30,260 | $ 28,801 | $ 21,361 | $ 15,400 | $ 8,712 | $ 19,677 | $ 11,777 | $ 5,126 | $ 95,822 | $ 45,292 | $ 107,936
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Net income per share: Basic | $ / shares | $ 0.62 | $ 0.59 | $ 0.43 | $ 0.31 | $ 0.18 | $ 0.40 | $ 0.24 | $ 0.11 | $ 1.95 | $ 0.92 | $ 2.22
Diluted (in dollars per share) | $ / shares | $ 0.60 | $ 0.57 | $ 0.43 | $ 0.31 | $ 0.18 | $ 0.40 | $ 0.24 | $ 0.10 | $ 1.92 | $ 0.91 | $ 2.20
Number of Operating Segments | segment |  |  |  |  |  |  |  |  | 3 |  |

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