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Revenue (Schedule Of Revenue By Contract Type) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Contracts Revenue $ 1,028,156 $ 1,117,361
Fixed Price [Member]    
Contracts Revenue 510,329  
Guaranteed Maximum Price [Member]    
Contracts Revenue 282,679  
Unit Price [Member]    
Contracts Revenue 84,228  
Cost Plus Fee And Other [Member]    
Contracts Revenue 150,920  
Civil [Member]    
Contracts Revenue 263,114 304,575
Civil [Member] | Fixed Price [Member]    
Contracts Revenue 183,904  
Civil [Member] | Guaranteed Maximum Price [Member]    
Contracts Revenue 5,072  
Civil [Member] | Unit Price [Member]    
Contracts Revenue 68,754  
Civil [Member] | Cost Plus Fee And Other [Member]    
Contracts Revenue 5,384  
Building [Member]    
Contracts Revenue 490,241 497,090
Building [Member] | Fixed Price [Member]    
Contracts Revenue 79,001  
Building [Member] | Guaranteed Maximum Price [Member]    
Contracts Revenue 262,028  
Building [Member] | Unit Price [Member]    
Contracts Revenue 8,816  
Building [Member] | Cost Plus Fee And Other [Member]    
Contracts Revenue 140,396  
Specialty Contractors [Member]    
Contracts Revenue 274,801 $ 315,696
Specialty Contractors [Member] | Fixed Price [Member]    
Contracts Revenue 247,424  
Specialty Contractors [Member] | Guaranteed Maximum Price [Member]    
Contracts Revenue 15,579  
Specialty Contractors [Member] | Unit Price [Member]    
Contracts Revenue 6,658  
Specialty Contractors [Member] | Cost Plus Fee And Other [Member]    
Contracts Revenue $ 5,140