Property and Equipment (Tables)

6 Months Ended

Jun. 30, 2020

Property, Plant and Equipment [Abstract]

Summary of property and equipment

	June 30,		December 31,
	2020		2019
Automobiles and trucks	$	2,107	$	2,161
Building and improvements		44,257		44,278
Construction equipment		151,874		153,147
Vessels and other equipment		82,680		84,022
Office equipment		8,764		8,652
		289,682		292,260
Less: Accumulated depreciation		(200,864)		(196,973)
Net book value of depreciable assets		88,818		95,287
Construction in progress		2,290		1,198
Land		35,863		35,863
	$	126,971	$	132,348