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Property and Equipment
6 Months Ended
Jun. 30, 2011
Property and Equipment [Abstract]  
Property, Plant and Equipment Disclosure
Property and Equipment


The following is a summary of property and equipment at June 30, 2011 and December 31, 2010:


 
June 30,

2011
 
December 31,

2010
Automobiles and trucks
$
1,948


 
2,134


Building and improvements
13,109


 
13,026


Construction equipment
126,076


 
122,792


Dredges and dredging equipment
94,306


 
91,018


Office equipment
3,769


 
3,528


 
239,208


 
232,498


Less: accumulated depreciation
(110,727
)
 
(100,170
)
Net book value of depreciable assets
128,481


 
132,328


Construction in progress
14,698


 
13,629


Land
9,354


 
9,354


 
$
152,533


 
$
155,311




For the three months ended June 30, 2011 and 2010, depreciation expense was $5.6 million and $4.6 million, respectively, and for the comparable six month period depreciation expense was $11.1 million and $9.1 million, respectively. Substantially all depreciation expense is included in the cost of contract revenue in the Company’s Condensed Consolidated Statements of Income.  The assets of the Company are pledged as collateral for the Company’s line of credit.