Property and Equipment (Tables)

9 Months Ended

Sep. 30, 2021

Property, Plant and Equipment [Abstract]

Summary of property and equipment

	September 30,		December 31,
	2021		2020
Automobiles and trucks	$	2,354	$	2,379
Building and improvements		34,797		44,324
Construction equipment		137,134		142,661
Vessels and other equipment		81,928		79,499
Office equipment		6,263		5,577
		262,476		274,440
Less: Accumulated depreciation		(190,091)		(186,615)
Net book value of depreciable assets		72,385		87,825
Construction in progress		6,415		1,809
Land		27,885		35,863
	$	106,685	$	125,497