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Goodwill and Intangible Assets (Schedule of Carrying Amount of Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Goodwill
Gross Goodwill Balance					$ 1,072,991
Accumulated Impairment	$ (867,800)		$ (867,800)		(487,985)
Impairment charge	(379,863)	$ 0	(379,863)	$ 0
Goodwill	205,143		205,143		585,006
Civil [Member]
Goodwill
Gross Goodwill Balance					492,074
Accumulated Impairment					(76,716)
Impairment charge	(210,215)
Goodwill	205,143		205,143		415,358
Building [Member]
Goodwill
Gross Goodwill Balance					424,724
Accumulated Impairment					(411,269)
Impairment charge	(13,455)
Goodwill	0		0		13,455
Specialty Contractors [Member]
Goodwill
Gross Goodwill Balance					156,193
Accumulated Impairment					0
Impairment charge	(156,193)
Goodwill	$ 0		$ 0		$ 156,193