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Property and Equipment (Tables)
6 Months Ended
Jun. 30, 2021
Property, Plant and Equipment [Abstract]  
Summary of property and equipment

    

June 30,

    

December 31, 

2021

2020

Automobiles and trucks

$

2,677

$

2,379

Building and improvements

 

34,780

 

44,324

Construction equipment

 

136,476

 

142,661

Vessels and other equipment

 

81,552

 

79,499

Office equipment

 

6,006

 

5,577

 

261,491

 

274,440

Less: Accumulated depreciation

 

(186,673)

 

(186,615)

Net book value of depreciable assets

 

74,818

 

87,825

Construction in progress

 

2,214

 

1,809

Land

 

27,885

 

35,863

$

104,917

$

125,497