​

  ​ ​ ​

June 30, 

  ​ ​ ​

December 31, 

​

​

2026

​

2025

Construction equipment

​

$

147,753

​

$

113,863

Vessels and other equipment

​

103,603

​

98,505

Building and improvements

​

36,229

​

36,229

Office equipment

​

6,175

​

5,999

Automobiles and trucks

​

1,593

​

1,429

Gross book value of depreciable assets

​

295,353

​

256,025

Less: Accumulated depreciation

​

(197,369)

​

(185,650)

Net book value of depreciable assets

​

97,984

​

70,375

Construction in progress

​

22,003

​

15,143

Land

​

9,642

​

2,692

Property and equipment, net of depreciation

​

$

129,629

​

$

88,210