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Property and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Property and Equipment    
Gross book value of depreciable assets $ 274,893 $ 262,578
Less: accumulated depreciation (202,819) (209,234)
Net book value of depreciable assets 72,074 53,344
Construction in progress 4,092 7,806
Land 24,948 24,948
Property and equipment, net of depreciation 101,114 86,098
Automobiles and trucks    
Property and Equipment    
Gross book value of depreciable assets 115,136 117,652
Building and improvements    
Property and Equipment    
Gross book value of depreciable assets 100,613 96,173
Construction equipment    
Property and Equipment    
Gross book value of depreciable assets 51,649 39,401
Vessels and other equipment    
Property and Equipment    
Gross book value of depreciable assets 5,802 1,790
Office equipment    
Property and Equipment    
Gross book value of depreciable assets $ 1,693 $ 7,562