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Business Segments (Narrative) (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) $ / shares | Sep. 30, 2017 USD ($) $ / shares | Jun. 30, 2017 USD ($) $ / shares | Mar. 31, 2017 USD ($) $ / shares | Dec. 31, 2016 USD ($) $ / shares | Sep. 30, 2016 USD ($) $ / shares | Jun. 30, 2016 USD ($) $ / shares | Mar. 31, 2016 USD ($) $ / shares | Dec. 31, 2017 USD ($) segment $ / shares | Dec. 31, 2016 USD ($) contract $ / shares | Dec. 31, 2015 USD ($) $ / shares
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 3 |  |
Income from construction operations | $ 59,343 | $ 49,072 | $ 34,045 | $ 37,017 | $ 52,050 | $ 60,919 | $ 48,829 | $ 40,122 | $ 179,477 | $ 201,920 | $ 105,413
DILUTED EARNINGS PER COMMON SHARE | $ / shares | $ 1.60 | $ 0.47 | $ 0.59 | $ 0.27 | $ 0.60 | $ 0.57 | $ 0.43 | $ 0.31 | $ 2.92 | $ 1.92 | $ 0.91
Building |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from construction operations |  |  |  |  |  |  |  |  | $ 34,199 | $ 51,564 | $ (1,240)
Building | Unfavorable Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from construction operations |  |  |  |  |  |  |  |  |  |  | $ (24,300)
DILUTED EARNINGS PER COMMON SHARE | $ / shares |  |  |  |  |  |  |  |  |  |  | $ (0.28)
Civil |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from construction operations |  |  |  |  |  |  |  |  | 192,207 | 172,668 | $ 145,213
Civil | Unfavorable Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from construction operations |  |  |  |  |  |  |  |  |  |  | $ (23,900)
DILUTED EARNINGS PER COMMON SHARE | $ / shares |  |  |  |  |  |  |  |  |  |  | $ (0.28)
Civil Runway Reconstruction Project [Member] | Unfavorable Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from construction operations |  |  |  |  |  |  |  |  |  |  | $ 13,700
DILUTED EARNINGS PER COMMON SHARE | $ / shares |  |  |  |  |  |  |  |  |  |  | $ (0.16)
Specialty Contractors |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from construction operations |  |  |  |  |  |  |  |  | $ 18,938 | 37,908 | $ 15,682
Specialty Contractors | Unfavorable Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from construction operations |  |  |  |  |  |  |  |  |  | (13,800) |
Five Star Electric [Member] | Unfavorable Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from construction operations |  |  |  |  |  |  |  |  |  |  | $ (45,600)
DILUTED EARNINGS PER COMMON SHARE | $ / shares |  |  |  |  |  |  |  |  |  |  | $ (0.53)
Five Star Electric [Member] | Specialty Contractors | Favorable Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from construction operations |  |  |  |  |  |  |  |  |  | $ 3,000 |
DILUTED EARNINGS PER COMMON SHARE | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.04 |
Five Star Electric Subcontract [Member] | Specialty Contractors | Unfavorable Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
DILUTED EARNINGS PER COMMON SHARE | $ / shares |  |  |  |  |  |  |  |  |  | $ (0.16) |
Five Star Electric Subcontract [Member] | Specialty Contractors | Favorable Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of projects | contract |  |  |  |  |  |  |  |  |  | 2 |
Income from construction operations |  |  |  |  |  |  |  |  |  | $ 14,000 |
DILUTED EARNINGS PER COMMON SHARE | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.17 |

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