Property and Equipment (Tables)

3 Months Ended

Mar. 31, 2017

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, 2017 and December 31, 2016:

	March 31, 2017			December 31, 2016
Automobiles and trucks	$	2,277		$	2,525
Building and improvements	37,277			37,269
Construction equipment	162,633			165,023
Vessels and other equipment	88,659			88,659
Office equipment	7,317			7,125
	298,163			300,601
Less: accumulated depreciation	(184,013		)	(181,293		)
Net book value of depreciable assets	114,150			119,308
Construction in progress	1,535			543
Land	38,231			38,231
	$	153,916		$	158,082