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Business Segments (Narrative) (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) $ / shares | Sep. 30, 2017 USD ($) $ / shares | Sep. 30, 2018 USD ($) segment $ / shares | Sep. 30, 2017 USD ($) $ / shares
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments | segment |  |  | 3 |
Income from construction operations | $ 47,306 | $ 49,072 | $ 101,196 | $ 120,134
After-tax impact | $ 25,436 | $ 25,300 | $ 42,390 | $ 71,697
DILUTED EARNINGS PER COMMON SHARE | $ / shares | $ 0.42 | $ 0.47 | $ 0.68 | $ 1.33
Building [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from construction operations | $ 8,853 | $ 14,058 | $ 27,814 | $ 25,035
Civil [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from construction operations | 41,282 | 38,144 | 93,560 | 128,176
Civil [Member] | Scenario Unfavorable Adjustment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from construction operations |  |  | 17,800 |
After-tax impact |  |  | $ 12,800 |
DILUTED EARNINGS PER COMMON SHARE | $ / shares |  |  | $ 0.25 |
Specialty Contractors [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from construction operations | 11,561 | 14,575 | $ 26,250 | 15,330
Corporate [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from construction operations | $ (14,390) | $ (17,705) | $ (46,428) | $ (48,407)

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