Property and Equipment (Tables)

3 Months Ended

Mar. 31, 2015

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 March 31, 2015 and December 31, 2014:

	March 31, 2015			December 31, 2014
Automobiles and trucks	$	2,209		$	2,006
Building and improvements	28,726			28,641
Construction equipment	147,221			146,088
Dredges and dredging equipment	99,491			96,275
Office equipment	4,991			4,891
	282,638			277,901
Less: accumulated depreciation	(166,282		)	(161,276		)
Net book value of depreciable assets	116,356			116,625
Construction in progress	5,827			5,274
Land	39,874			39,874
	$	162,057		$	161,773