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Property and Equipment (Tables)
6 Months Ended
Jun. 30, 2024
Property, Plant and Equipment [Abstract]  
Summary of property and equipment

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June 30, 

    

December 31, 

​

​

2024

​

2023

Automobiles and trucks

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$

1,959

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$

1,985

Building and improvements

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36,931

​

 

36,931

Construction equipment

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125,030

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125,705

Vessels and other equipment

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95,528

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94,030

Office equipment

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7,081

​

 

6,708

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​

 

266,529

​

 

265,359

Less: Accumulated depreciation

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(211,779)

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(206,243)

Net book value of depreciable assets

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54,750

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59,116

Construction in progress

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6,277

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3,770

Land

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24,948

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24,948

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$

85,975

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$

87,834