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Property and Equipment (Tables)
12 Months Ended
Dec. 31, 2025
Property, Plant and Equipment [Abstract]  
Summary of property and equipment

  ​ ​ ​

December 31, 

  ​ ​ ​

December 31, 

2025

2024

Construction equipment

$

113,863

$

117,652

Vessels and other equipment

 

98,505

 

96,173

Building and improvements

 

36,229

 

39,401

Automobiles and trucks

 

5,999

 

1,790

Office equipment

 

1,429

 

7,562

Gross book value of depreciable assets

 

256,025

 

262,578

Less: Accumulated depreciation

 

(185,650)

 

(209,234)

Net book value of depreciable assets

 

70,375

 

53,344

Construction in progress

 

15,143

 

7,806

Land

 

2,692

 

24,948

Property and equipment, net of depreciation

$

88,210

$

86,098