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)

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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