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Property and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Property and Equipment    
Depreciable property and equipment, gross $ 263,903 $ 262,578
Less: accumulated depreciation (211,560) (209,234)
Net book value of depreciable assets 52,343 53,344
Construction in progress 14,665 7,806
Land 24,948 24,948
Property and equipment, net of depreciation 91,956 86,098
Automobiles and trucks    
Property and Equipment    
Depreciable property and equipment, gross 1,789 1,790
Building and improvements    
Property and Equipment    
Depreciable property and equipment, gross 39,411 39,401
Construction equipment    
Property and Equipment    
Depreciable property and equipment, gross 117,908 117,652
Vessels and other equipment    
Property and Equipment    
Depreciable property and equipment, gross 97,232 96,172
Office equipment    
Property and Equipment    
Depreciable property and equipment, gross $ 7,563 $ 7,562