Property and Equipment (Tables)

3 Months Ended

Mar. 31, 2020

Property, Plant and Equipment [Abstract]

Summary of property and equipment

	March 31,		December 31,
	2020		2019
Automobiles and trucks	$	2,100	$	2,161
Building and improvements		44,337		44,278
Construction equipment		150,544		153,147
Vessels and other equipment		82,284		84,022
Office equipment		8,670		8,652
		287,935		292,260
Less: Accumulated depreciation		(196,008)		(196,973)
Net book value of depreciable assets		91,927		95,287
Construction in progress		1,325		1,198
Land		35,863		35,863
	$	129,115	$	132,348