Property and Equipment (Tables)

3 Months Ended

Mar. 31, 2021

Property, Plant and Equipment [Abstract]

Summary of property and equipment

	March 31,		December 31,
	2021		2020
Automobiles and trucks	$	2,722	$	2,379
Building and improvements		44,325		44,324
Construction equipment		135,485		142,661
Vessels and other equipment		80,686		79,499
Office equipment		5,947		5,577
		269,165		274,440
Less: Accumulated depreciation		(185,883)		(186,615)
Net book value of depreciable assets		83,282		87,825
Construction in progress		1,734		1,809
Land		35,863		35,863
	$	120,879	$	125,497