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Business Segments (Total Assets for Reportable Segments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Segment Reporting Information [Line Items]    
Total assets $ 4,870,077 $ 4,242,710
Corporate and other    
Segment Reporting Information [Line Items]    
Total assets (785,439) (679,065)
Civil | Operating Segments    
Segment Reporting Information [Line Items]    
Total assets 4,063,249 3,636,825
Building | Operating Segments    
Segment Reporting Information [Line Items]    
Total assets 1,375,154 1,085,998
Specialty Contractors | Operating Segments    
Segment Reporting Information [Line Items]    
Total assets $ 217,113 $ 198,952