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Accounts Receivable (Tables)
12 Months Ended
Dec. 31, 2012
Accounts Receivable [Abstract]  
Summary of Accounts Receivable
                 
$ in thousands   2012     2011  

Trade receivables

  $ 3,893     $ 3,389  

Contract receivables

    26,171       20,274  

Allowance for doubtful accounts

    (565     (554
   

 

 

   

 

 

 
    $ 29,499     $ 23,109