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Property and Equipment
3 Months Ended
Mar. 31, 2015
Property, Plant and Equipment [Abstract]  
Property and Equipment
Property and Equipment

The following is a summary of property and equipment at March 31, 2015 and December 31, 2014:
 
March 31,
2015
 
December 31,
2014
Automobiles and trucks
$
2,209

 
$
2,006

Building and improvements
28,726

 
28,641

Construction equipment
147,221

 
146,088

Dredges and dredging equipment
99,491

 
96,275

Office equipment
4,991

 
4,891

 
282,638

 
277,901

Less: accumulated depreciation
(166,282
)
 
(161,276
)
Net book value of depreciable assets
116,356

 
116,625

Construction in progress
5,827

 
5,274

Land
39,874

 
39,874

 
$
162,057

 
$
161,773


For the three months ended March 31, 2015, and 2014, depreciation expense was $5.4 million and $5.6 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).

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