Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2013

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 December 31, 2013 and December 31, 2012:

	December 31, 2013			December 31, 2012
Automobiles and trucks	$	2,148		$	1,591
Building and improvements	22,828			22,037
Construction equipment	145,309			140,835
Dredges and dredging equipment	93,963			96,927
Office equipment	4,545			4,095
	268,793			265,485
Less: accumulated depreciation	(144,121		)	(136,556		)
Net book value of depreciable assets	124,672			128,929
Construction in progress	2,458			6,949
Land	14,793			14,793
	$	141,923		$	150,671