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Property and Equipment (Tables)
12 Months Ended
Dec. 31, 2023
Property, Plant and Equipment [Abstract]  
Summary of property and equipment

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December 31,

    

December 31, 

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2023

​

2022

Automobiles and trucks

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$

1,985

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$

2,232

Building and improvements

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36,931

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36,952

Construction equipment

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125,705

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130,660

Vessels and other equipment

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94,030

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91,495

Office equipment

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6,708

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6,885

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265,359

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268,224

Less: Accumulated depreciation

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(206,243)

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(195,948)

Net book value of depreciable assets

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59,116

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72,276

Construction in progress

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3,770

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816

Land

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24,948

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27,885

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$

87,834

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$

100,977