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Goodwill and Intangible Assets (Schedule of Carrying Amount of Goodwill) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Goodwill    
Gross Goodwill Balance   $ 1,072,991
Accumulated Impairment   (487,985)
Goodwill $ 585,006 585,006
Civil [Member]    
Goodwill    
Gross Goodwill Balance   492,074
Accumulated Impairment   (76,716)
Goodwill 415,358 415,358
Building [Member]    
Goodwill    
Gross Goodwill Balance   424,724
Accumulated Impairment   (411,269)
Goodwill 13,455 13,455
Specialty Contractors [Member]    
Goodwill    
Gross Goodwill Balance   156,193
Goodwill $ 156,193 $ 156,193