Property and Equipment (Tables)

12 Months Ended

Dec. 31, 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 December 31, 2014 and December 31, 2013:

	December 31, 2014			December 31, 2013
Automobiles and trucks	$	2,006		$	2,148
Building and improvements	28,641			22,828
Construction equipment	146,088			145,309
Dredges and dredging equipment	96,275			93,963
Office equipment	4,891			4,545
	277,901			268,793
Less: accumulated depreciation	(161,276		)	(144,121		)
Net book value of depreciable assets	116,625			124,672
Construction in progress	5,274			2,458
Land	39,874			14,793
	$	161,773		$	141,923