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Property and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Property, Plant and Equipment          
Property, plant and equipment, gross $ 289,340   $ 289,340   $ 304,728
Less: accumulated depreciation (193,235)   (193,235)   (195,373)
Net book value of depreciable assets 96,105   96,105   109,355
Property and equipment, net of depreciation 134,056   134,056   148,003
Depreciation 5,800 $ 6,100 17,600 $ 18,600  
Automobiles and trucks          
Property, Plant and Equipment          
Property, plant and equipment, gross 1,752   1,752   1,709
Building and improvements          
Property, Plant and Equipment          
Property, plant and equipment, gross 43,831   43,831   43,628
Construction equipment          
Property, Plant and Equipment          
Property, plant and equipment, gross 151,267   151,267   161,113
Vessels and other equipment          
Property, Plant and Equipment          
Property, plant and equipment, gross 84,228   84,228   90,217
Office equipment          
Property, Plant and Equipment          
Property, plant and equipment, gross 8,262   8,262   8,061
Construction in progress          
Property, Plant and Equipment          
Property, plant and equipment, gross 2,088   2,088   2,785
Land          
Property, Plant and Equipment          
Property, plant and equipment, gross $ 35,863   $ 35,863   $ 35,863