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Property and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Property and Equipment    
Depreciable property and equipment, gross $ 266,529 $ 265,359
Less: accumulated depreciation (211,779) (206,243)
Net book value of depreciable assets 54,750 59,116
Construction in progress 6,277 3,770
Land 24,948 24,948
Property and equipment, net of depreciation 85,975 87,834
Automobiles and trucks    
Property and Equipment    
Depreciable property and equipment, gross 1,959 1,985
Building and improvements    
Property and Equipment    
Depreciable property and equipment, gross 36,931 36,931
Construction equipment    
Property and Equipment    
Depreciable property and equipment, gross 125,030 125,705
Vessels and other equipment    
Property and Equipment    
Depreciable property and equipment, gross 95,528 94,030
Office equipment    
Property and Equipment    
Depreciable property and equipment, gross $ 7,081 $ 6,708