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Property and equipment net (Tables)
6 Months Ended
Jun. 30, 2012
Property and equipment - net [Abstract]  
Property and equipment - net
                     
    Estimated
Useful
Life
(Years)
  June 30,
2012
    December 31,
2011
 

Land

  —     $ 5,273     $ 5,273  

Buildings

  39-40     54,948       54,948  

Building improvements

  5-40     114,225       114,247  

Machinery and equipment

  3-15     82,402       83,476  

Furniture, fixtures and office equipment

  5-10     5,135       5,249  

Computer equipment and software

  3     12,177       13,049  

Leasehold improvements

        48       53  

Construction in progress

        11,187       8,498  
       

 

 

   

 

 

 
          285,395       284,793  

Less accumulated depreciation and amortization

        (96,236     (91,764
       

 

 

   

 

 

 

Property and equipment — net

      $ 189,159     $ 193,029  
       

 

 

   

 

 

 
Depreciation and amortization expense
                                 
    Three months ended
June  30,
    Six months ended
June  30,
 
    2012     2011     2012     2011  

Depreciation and amortization expense

  $ 3,304     $ 3,580     $ 6,661     $ 7,379