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Property and Equipment
3 Months Ended
Mar. 31, 2013
Property, Plant and Equipment [Abstract]  
Property and Equipment
Property and Equipment

The following is a summary of property and equipment at March 31, 2013 and December 31, 2012:
 
March 31,
2013
 
December 31,
2012
Automobiles and trucks
$
2,180

 
$
1,591

Building and improvements
22,828

 
22,037

Construction equipment
140,115

 
140,835

Dredges and dredging equipment
96,927

 
96,927

Office equipment
4,245

 
4,095

 
266,295

 
265,485

Less: accumulated depreciation
(141,768
)
 
(136,556
)
Net book value of depreciable assets
124,527

 
128,929

Construction in progress
8,774

 
6,949

Land
14,793

 
14,793

 
$
148,094

 
$
150,671


For the three months ended March 31, 2013, and 2012 , depreciation expense was $5.3 million and $5.4 million, respectively. Substantially all depreciation expense is included in the cost of contract revenue in the Company’s Condensed Consolidated Statements of Operations.  The assets of the Company are pledged as collateral under the Company's Credit Agreement (as defined in Note 10).