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Property and Equipment
3 Months Ended
Mar. 31, 2014
Property, Plant and Equipment [Abstract]  
Property and Equipment
Property and Equipment

The following is a summary of property and equipment at March 31, 2014 and December 31, 2013:
 
March 31,
2014
 
December 31,
2013
Automobiles and trucks
$
2,038

 
$
2,148

Building and improvements
22,828

 
22,828

Construction equipment
145,770

 
145,309

Dredges and dredging equipment
93,889

 
93,963

Office equipment
4,919

 
4,545

 
269,444

 
268,793

Less: accumulated depreciation
(149,403
)
 
(144,121
)
Net book value of depreciable assets
120,041

 
124,672

Construction in progress
3,422

 
2,458

Land
36,992

 
14,793

 
$
160,455

 
$
141,923


For the three months ended March 31, 2014, and 2013, depreciation expense was $5.6 million and $5.3 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).

In February 2014, the Company purchased approximately 340 acres of land located in the upper Houston Ship Channel, Harris County, Texas for approximately $22 million. The site is to be used as a private dredge material placement area, after certain improvements are completed in early 2014. The Company drew on the revolver portion of its credit facility to purchase the land.

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