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Goodwill and Intangible Assets (Schedule of Changes in Carrying Amount of Goodwill) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Goodwill [Line Items]      
Gross goodwill as of December 31, 2022     $ 1,072,991
Accumulated impairment as of December 31, 2022 $ (867,800)   (867,848)
Goodwill [Roll Forward]      
Balance at beginning of period 205,143 $ 205,143  
Activity 0 0  
Balance at end of period 205,143 205,143  
Civil      
Goodwill [Line Items]      
Gross goodwill as of December 31, 2022     492,074
Accumulated impairment as of December 31, 2022     (286,931)
Goodwill [Roll Forward]      
Balance at beginning of period 205,143 205,143  
Activity 0 0  
Balance at end of period 205,143 205,143  
Building      
Goodwill [Line Items]      
Gross goodwill as of December 31, 2022     424,724
Accumulated impairment as of December 31, 2022     (424,724)
Goodwill [Roll Forward]      
Balance at beginning of period 0 0  
Activity 0 0  
Balance at end of period 0 0  
Specialty Contractors      
Goodwill [Line Items]      
Gross goodwill as of December 31, 2022     156,193
Accumulated impairment as of December 31, 2022     $ (156,193)
Goodwill [Roll Forward]      
Balance at beginning of period 0 0  
Activity 0 0  
Balance at end of period $ 0 $ 0