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Property and Equipment
9 Months Ended
Sep. 30, 2011
Property and Equipment [Abstract] 
Property, Plant and Equipment Disclosure
Property and Equipment

The following is a summary of property and equipment at September 30, 2011 and December 31, 2010:
 
September 30,
2011
 
December 31,
2010
Automobiles and trucks
$
1,552

 
$
2,134

Building and improvements
13,361

 
13,026

Construction equipment
130,525

 
122,792

Dredges and dredging equipment
94,831

 
91,018

Office equipment
3,802

 
3,528

 
244,071

 
232,498

Less: accumulated depreciation
(114,881
)
 
(100,170
)
Net book value of depreciable assets
129,190

 
132,328

Construction in progress
10,996

 
13,629

Land
9,354

 
9,354

 
$
149,540

 
$
155,311


For the three months ended September 30, 2011 and 2010, depreciation expense was $5.6 million and $4.9 million, respectively, and for the comparable nine month period depreciation expense was $16.7 million and $14.0 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.