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Business Segments (Total Assets for Reportable Segments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]    
Total assets $ 4,386,501 $ 4,429,856
Corporate and other    
Segment Reporting Information [Line Items]    
Total assets (560,709) (315,825)
Civil | Operating Segments    
Segment Reporting Information [Line Items]    
Total assets 3,675,300 3,539,608
Building | Operating Segments    
Segment Reporting Information [Line Items]    
Total assets 1,065,027 898,902
Specialty Contractors | Operating Segments    
Segment Reporting Information [Line Items]    
Total assets $ 206,883 $ 307,171