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Business Segments (Narrative) (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) $ / shares | Jun. 30, 2017 USD ($) $ / shares | Jun. 30, 2018 USD ($) segment $ / shares | Jun. 30, 2017 USD ($) $ / shares
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments | segment |  |  | 3 |
Income from construction operations | $ 54,815 | $ 34,045 | $ 53,890 | $ 71,062
After-tax impact | $ 27,896 | $ 32,633 | $ 16,954 | $ 46,397
DILUTED EARNINGS PER COMMON SHARE | $ / shares | $ 0.49 | $ 0.59 | $ 0.25 | $ 0.86
Building [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from construction operations | $ 12,536 | $ 5,736 | $ 18,961 | $ 10,977
Civil [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from construction operations | 49,439 | 58,144 | 52,278 | 90,032
Civil [Member] | Scenario Unfavorable Adjustment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from construction operations |  |  | 17,800 |
After-tax impact |  |  | $ 12,700 |
DILUTED EARNINGS PER COMMON SHARE | $ / shares |  |  | $ 0.25 |
Specialty Contractors [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from construction operations | 7,454 | (14,007) | $ 14,689 | 755
Corporate [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from construction operations | $ (14,614) | $ (15,828) | $ (32,038) | $ (30,702)

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