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Property and equipment
3 Months Ended
Mar. 31, 2014
Property and equipment

6. Property and equipment

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

 

     Estimated
Useful
Life
(Years)
     March 31,
2014
    December 31,
2013
 

Land

     —        $ 5,273      $ 5,273   

Buildings

     39-40         54,948        54,948   

Building improvements

     5-40         114,099        114,099   

Machinery and equipment

     3-15         82,189        82,189   

Furniture, fixtures and office equipment

     5-10         5,046        5,046   

Computer equipment and software

     3         11,306        11,289   

Leasehold improvements

     4         17        17   

Construction in progress

        17,041        14,756   
     

 

 

   

 

 

 
        289,919        287,617   

Less accumulated depreciation and amortization

        (113,582     (111,060
     

 

 

   

 

 

 

Property and equipment — net

      $ 176,337      $ 176,557   
     

 

 

   

 

 

 

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 months ended March 31, 2014 and 2013 was as follows (in thousands):

 

     Three months ended
March 31,
 
     2014      2013  

Depreciation and amortization expense

   $ 2,522       $ 2,990