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Property and Equipment
9 Months Ended
Sep. 30, 2013
Property, Plant and Equipment [Abstract]  
Property and Equipment
Property and Equipment

The following is a summary of property and equipment at September 30, 2013 and December 31, 2012:
 
September 30,
2013
 
December 31,
2012
Automobiles and trucks
$
2,180

 
$
1,591

Building and improvements
22,828

 
22,037

Construction equipment
142,131

 
140,835

Dredges and dredging equipment
100,142

 
96,927

Office equipment
4,479

 
4,095

 
271,760

 
265,485

Less: accumulated depreciation
(151,928
)
 
(136,556
)
Net book value of depreciable assets
119,832

 
128,929

Construction in progress
11,938

 
6,949

Land
14,793

 
14,793

 
$
146,563

 
$
150,671


For the three months ended September 30, 2013, and 2012 , depreciation expense was $5.3 million and $5.3 million, respectively, and for the nine month period, depreciation expense was $15.8 million and $16.0 million in 2013 and 2012, 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).

In the third quarter 2013, part of the assets held for sale were sold to third party vendors, generating proceeds of approximately $81,000, and the Company elected to reduce the value of certain assets by approximately $15,000 to their current estimated market value. The Company continues to actively market the assets remaining as held for sale.

The Company’s long-lived assets are substantially located in the United States.