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Property and equipment
6 Months Ended
Jun. 30, 2013
Property and equipment

6. Property and equipment

Property and equipment — net consist of the following (dollar amounts in thousands):

 

     Estimated
Useful
Life
(Years)
     June 30,
2013
    December 31,
2012
 

Land

     —        $ 5,273      $ 5,273   

Buildings

     39-40         54,948        54,948   

Building improvements

     5-40         114,245        114,245   

Machinery and equipment

     3-15         81,368        81,382   

Furniture, fixtures and office equipment

     5-10         5,164        5,239   

Computer equipment and software

     3         11,834        11,840   

Leasehold improvements

        17        17   

Construction in progress

        13,757        12,266   
     

 

 

   

 

 

 
        286,606        285,210   

Less accumulated depreciation and amortization

        (107,039     (101,249
     

 

 

   

 

 

 

Property and equipment — net

      $ 179,567      $ 183,961   
     

 

 

   

 

 

 

Leasehold improvements are amortized over four years which is the shorter of the term of the lease or the service lives of the improvements.

Depreciation and amortization expense related to property and equipment for the three and six months ended June 30, 2013 and 2012 was as follows (in thousands):

 

     Three months ended
June 30,
     Six months ended
June 30,
 
     2013      2012      2013      2012  

Depreciation and amortization expense

   $ 2,956       $ 3,304       $ 5,946       $ 6,661