Business Segments (Narrative) (Details) $ / shares in Units, $ in Thousands	3 Months Ended
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)

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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