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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 18, 2022
Dec. 13, 2019
Mar. 31, 2016
Dec. 31, 2019
Dec. 31, 2024
Apr. 13, 2023
Alaskan Way Viaduct Matter            
Contingencies and Commitments            
Value of claim filed     $ 57,200      
Settlement on judgment, awarded to other party   $ 57,200        
Pre-tax charge, impact from jury verdict       $ 166,800    
Pre-tax accrual, impact from jury verdict       25,700    
Settlement on judgment       $ 57,200    
Loss contingency, damages paid, value $ 34,600          
Alaskan Way Viaduct Matter | Seattle Tunnel Partners            
Contingencies and Commitments            
Ownership percentage in joint venture         45.00%  
Seattle Tunnel Partners            
Contingencies and Commitments            
Value of counterclaim filed in excess of     $ 640,000      
HNTB            
Contingencies and Commitments            
Value of counterclaim filed in excess of           $ 300,000