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Property and equipment
6 Months Ended
Jun. 30, 2015
Property and equipment

3. Property and equipment

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

 

     Estimated
Useful
Life
(Years)
     June 30,
2015
     December 31,
2014
 

Land

     —        $ 5,273       $ 5,273   

Buildings

     39-40         54,948         54,948   

Building improvements

     5-40         131,300         114,131   

Machinery and equipment

     3-15         102,996         80,919   

Furniture, fixtures and office equipment

     5-10         5,015         5,015   

Computer equipment and software

     3         10,355         10,465   

Leasehold improvements

     4         17         17   

Construction in progress

        7,118         39,580   
     

 

 

    

 

 

 
        317,022         310,348   

Less accumulated depreciation and amortization

        (123,154      (118,221
     

 

 

    

 

 

 

Property and equipment — net

      $ 193,868       $ 192,127   
     

 

 

    

 

 

 

 

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, 2015 and 2014 was as follows (in thousands):

 

     Three months ended
June 30,
     Six months ended
June 30,
 
     2015      2014      2015      2014  

Depreciation and amortization expense

   $ 2,740       $ 2,449       $ 5,117       $ 4,972