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Business Segments (Schedule of Assets by Segment) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Reportable segment information    
Total Assets $ 4,308,129 $ 4,264,123
Civil [Member]    
Reportable segment information    
Total Assets 2,404,703 2,452,108
Building [Member]    
Reportable segment information    
Total Assets 926,789 909,207
Specialty Contractors [Member]    
Reportable segment information    
Total Assets 763,933 767,807
Corporate and Other [Member]    
Reportable segment information    
Total Assets $ 212,704 $ 135,001