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

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September 30, 

    

December 31, 

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2024

​

2023

Automobiles and trucks

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$

1,789

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$

1,985

Building and improvements

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39,401

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36,931

Construction equipment

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120,968

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125,705

Vessels and other equipment

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96,009

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94,030

Office equipment

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7,177

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6,708

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265,344

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265,359

Less: Accumulated depreciation

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(209,644)

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(206,243)

Net book value of depreciable assets

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55,700

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59,116

Construction in progress

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5,606

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3,770

Land

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24,948

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24,948

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$

86,254

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$

87,834