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Property and Equipment
12 Months Ended
Dec. 31, 2025
Property, Plant and Equipment [Abstract]  
Property and Equipment

6.Property and Equipment

The following is a summary of property and equipment as of December 31, 2025 and December 31, 2024:

  ​ ​ ​

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

Substantially all depreciation expense is included in the cost of contract revenue in the Company’s Consolidated Statements of Operations. Substantially all of the assets of the Company are pledged as collateral under the Company’s Credit Agreement (as defined in Note 9).

Interest costs of $0.3 million were capitalized during the year ended December 31, 2025, related to the build-out of the Company’s new corporate office facility.

Substantially all of the Company’s long-lived assets are located in the United States.

See Note 2 to the Company’s consolidated financial statements for further discussion of property and equipment.