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Accounts Receivable
 12 Months Ended
Dec. 31, 2011
Accounts Receivable [Abstract]  
Accounts Receivable
(7) Accounts Receivable

Accounts receivable consists of the following (in thousands):

 

     December 31,  
     2011     2010  

Commercial

    $ 42,860      $ 35,389   

U.S. Government

      480        6,598   
  

 

 

    

 

 

  
     43,340        41,987   

Allowance for doubtful accounts

      (356 )      (553 ) 
  

 

 

    

 

 

  
   $ 42,984      $ 41,434   
  

 

 

    

 

 

  

Accounts receivable from the U.S. Government includes amounts due under long-term contracts, all of which are billed at December 31, 2011 and 2010, of $480,000 and $6,598,000 respectively.