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Accounts Receivable
 12 Months Ended
Dec. 31, 2012
Accounts Receivable [Abstract]  
Accounts Receivable
(7) Accounts Receivable

Accounts receivable consists of the following (in thousands):

 

                 
    December 31,  
    2012     2011  
     

Commercial

   $ 38,220     $ 42,860  

U.S. Government

     620       480  
   

 

 

    

 

 

  
     
      38,840       43,340  

Allowance for doubtful accounts

     (310 )      (356 ) 
   

 

 

    

 

 

  
     
    $ 38,530     $ 42,984  
   

 

 

    

 

 

  

Accounts receivable from the U.S. Government includes amounts due under long-term contracts, all of which are billed at December 31, 2012 and 2011, of $620,000 and $480,000 respectively.