Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

Summary of property and equipment

	December 31,		December 31,
	2020		2019
Automobiles and trucks	$	2,379	$	2,161
Building and improvements		44,324		44,278
Construction equipment		142,661		153,147
Vessels and other equipment		79,499		84,022
Office equipment		5,577		8,652
		274,440		292,260
Less: Accumulated depreciation		(186,615)		(196,973)
Net book value of depreciable assets		87,825		95,287
Construction in progress		1,809		1,198
Land		35,863		35,863
	$	125,497	$	132,348