Property and Equipment (Tables)

9 Months Ended

Sep. 30, 2020

Property, Plant and Equipment [Abstract]

Summary of property and equipment

	September 30,		December 31,
	2020		2019
Automobiles and trucks	$	2,267	$	2,161
Building and improvements		44,324		44,278
Construction equipment		145,774		153,147
Vessels and other equipment		75,511		84,022
Office equipment		9,052		8,652
		276,928		292,260
Less: Accumulated depreciation		(190,748)		(196,973)
Net book value of depreciable assets		86,180		95,287
Construction in progress		3,868		1,198
Land		35,863		35,863
	$	125,911	$	132,348