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

Land

    —       $ 5,273     $ 5,273  

Buildings

    39-40       54,948       54,948  

Building improvements

    5-40       114,245       114,247  

Machinery and equipment

    3-15       82,402       83,476  

Furniture, fixtures and office equipment

    5-10       5,199       5,249  

Computer equipment and software

    3       12,177       13,049  

Leasehold improvements

            48       53  

Construction in progress

            11,792       8,498  
              286,084       284,793  

Less accumulated depreciation and amortization

            (99,473     (91,764
           

 

 

   

 

 

 

Property and equipment — net

          $ 186,611     $ 193,029  
           

 

 

   

 

 

 
Depreciation and amortization expense
                                 
    Three months ended
September 30,
    Nine months ended
September 30,
 
    2012     2011     2012     2011  

Depreciation and amortization expense

  $ 3,237     $ 3,745     $ 9,898     $ 11,124