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Property and Equipment (Tables)
3 Months Ended
Mar. 31, 2026
Property, Plant and Equipment [Abstract]  
Summary of property and equipment

  ​ ​ ​

March 31, 

  ​ ​ ​

December 31, 

2026

2025

Construction equipment

$

141,930

$

113,863

Vessels and other equipment

 

99,708

 

98,505

Building and improvements

 

36,229

 

36,229

Office equipment

 

6,007

 

5,999

Automobiles and trucks

 

1,354

 

1,429

Gross book value of depreciable assets

 

285,228

 

256,025

Less: Accumulated depreciation

 

(189,573)

 

(185,650)

Net book value of depreciable assets

 

95,655

 

70,375

Construction in progress

 

20,147

 

15,143

Land

 

9,642

 

2,692

Property and equipment, net of depreciation

$

125,444

$

88,210