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Property and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Property and Equipment    
Depreciable property and equipment, gross $ 265,344 $ 265,359
Less: accumulated depreciation (209,644) (206,243)
Net book value of depreciable assets 55,700 59,116
Construction in progress 5,606 3,770
Land 24,948 24,948
Property, Plant and Equipment, Net, Total 86,254 87,834
Automobiles and trucks    
Property and Equipment    
Depreciable property and equipment, gross 1,789 1,985
Building and improvements    
Property and Equipment    
Depreciable property and equipment, gross 39,401 36,931
Construction equipment    
Property and Equipment    
Depreciable property and equipment, gross 120,968 125,705
Vessels and other equipment    
Property and Equipment    
Depreciable property and equipment, gross 96,009 94,030
Office equipment    
Property and Equipment    
Depreciable property and equipment, gross $ 7,177 $ 6,708