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Property and Equipment
 12 Months Ended
Dec. 31, 2013
Property and Equipment  
Property and Equipment

4. Property and Equipment
 The amount of property and equipment and their respective estimated useful lives are as follows (in thousands, except estimated useful lives):

 
   As of December 31,    
 
   Estimated
Useful Lives
 
   2013
   2012
 

Land

   $ 4,653   $ 4,653   Indefinite

Buildings and leasehold improvements

     20,299     21,081   3 - 15 years

Office equipment, furniture and fixtures

     8,629     8,415   3 - 7 years

Computer equipment and software costs

     88,077     80,233   3 - 9 years

Machinery, equipment and vehicles

     92,364     66,122   3 - 30 years
     

 

     214,022     180,504    

Accumulated depreciation and amortization

     84,337     67,979    
     

 

   $ 129,685   $ 112,525    
     

For 2013, 2012 and 2011, we recorded depreciation expense of $22.0 million, $18.6 million and $15.5 million, respectively.

The amount of computer software costs, including capitalized internally developed software costs are as follows (in thousands):

As of December 31,
  
 
   2013
   2012
  
   

Computer software costs

   $ 67,366   $ 60,465  

Accumulated amortization

     35,499     27,710  
   

Computer software costs, net

   $ 31,867   $ 32,755  
   

Included in capitalized computer software costs are costs incurred in connection with software development in progress of $6.0 million and $3.0 million as of December 31, 2013 and 2012, respectively. For 2013, 2012 and 2011, we recorded amortization expense related to computer software costs of $7.8 million, $7.2 million and $6.1 million, respectively.

The assets and accumulated amortization recorded under capital leases are as follows (in thousands):

As of December 31,
  
 
   2013
   2012
  
   

Capital leases

   $ 5,268   $ 4,489  

Accumulated amortization

     1,869     816  
   

Capital leases, net

   $ 3,399   $ 3,673