Property and Equipment (Tables)

3 Months Ended

Mar. 31, 2019

Mar. 31, 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 March 31, 2019 and December 31, 2018:

	March 31, 2019			December 31, 2018
Automobiles and trucks	$	1,668		$	1,709
Building and improvements	43,628			43,628
Construction equipment	156,015			161,113
Vessels and other equipment	81,772			90,217
Office equipment	8,114			8,061
	291,197			304,728
Less: Accumulated depreciation	(194,225		)	(195,373		)
Net book value of depreciable assets	96,972			109,355
Construction in progress	4,006			2,785
Land	35,863			35,863
	$	136,841		$	148,003