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Business Segments (Narrative) (Details) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2018 USD ($) segment $ / shares | Mar. 31, 2017 USD ($) $ / shares
Segment Reporting Information [Line Items] |  |
Number of reportable segments | segment | 3 |
Income from construction operations | $ (925) | $ 37,017
After-tax impact | $ (10,942) | $ 13,764
DILUTED EARNINGS (LOSS) PER COMMON SHARE (in dollars per share) | $ / shares | $ (0.24) | $ 0.27
Building [Member] |  |
Segment Reporting Information [Line Items] |  |
Income from construction operations | $ 6,425 | $ 5,242
Civil [Member] |  |
Segment Reporting Information [Line Items] |  |
Income from construction operations | 2,839 | 31,888
Civil [Member] | Scenario Unfavorable Adjustment [Member] |  |
Segment Reporting Information [Line Items] |  |
Income from construction operations | 17,800 |
After-tax impact | $ 12,700 |
DILUTED EARNINGS (LOSS) PER COMMON SHARE (in dollars per share) | $ / shares | $ 0.25 |
Specialty Contractors [Member] |  |
Segment Reporting Information [Line Items] |  |
Income from construction operations | $ 7,235 | 14,762
Corporate [Member] |  |
Segment Reporting Information [Line Items] |  |
Income from construction operations | $ (17,424) | $ (14,875)

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