Property and Equipment (Tables)

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

Property, Plant and Equipment [Abstract]

Summary of property and equipment

Depreciation is computed using the straight-line method over the estimated useful lives of the related assets for financial statement purposes, as follows:

Automobiles and trucks	3 to 5 years
Buildings and improvements	5 to 30 years
Construction equipment	3 to 15 years
Vessels and other equipment	1 to 15 years
Office equipment	1 to 5 years

The following is a summary of property and equipment at June 30, 2019 and December 31, 2018:

	June 30, 2019			December 31, 2018
Automobiles and trucks	$	1,669		$	1,709
Building and improvements	43,790			43,628
Construction equipment	158,684			161,113
Vessels and other equipment	82,875			90,217
Office equipment	8,183			8,061
	295,201			304,728
Less: Accumulated depreciation	(197,340		)	(195,373		)
Net book value of depreciable assets	97,861			109,355
Construction in progress	1,321			2,785
Land	35,863			35,863
	$	135,045		$	148,003