Property and Equipment (Tables)

6 Months Ended

Jun. 30, 2014

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 dredges	1 to 15 years
Office equipment	1 to 5 years

The following is a summary of property and equipment at June 30, 2014 and December 31, 2013:

	June 30, 2014			December 31, 2013
Automobiles and trucks	$	2,048		$	2,148
Building and improvements	23,058			22,828
Construction equipment	146,632			145,309
Dredges and dredging equipment	94,428			93,963
Office equipment	4,533			4,545
	270,699			268,793
Less: accumulated depreciation	(154,337		)	(144,121		)
Net book value of depreciable assets	116,362			124,672
Construction in progress	10,158			2,458
Land	36,992			14,793
	$	163,512		$	141,923