Property and Equipment (Tables)

9 Months Ended

Sep. 30, 2016

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 September 30, 2016 and December 31, 2015:

	September 30, 2016			December 31, 2015
Automobiles and trucks	$	2,525		$	2,749
Building and improvements	31,374			28,226
Construction equipment	164,985			159,963
Vessels and other equipment	86,402			89,485
Office equipment	7,059			6,057
	292,345			286,480
Less: accumulated depreciation	(176,681		)	(164,371		)
Net book value of depreciable assets	115,664			122,109
Construction in progress	7,348			5,649
Land	38,231			38,231
	$	161,243		$	165,989