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Accounts Receivable and Unbilled Accounts Receivable (Schedule of Major Customers, by Percentage of Revenues) (Details) (Revenues [Member], Customer Concentration Risk [Member])
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Transportation Security Administration ("TSA") [Member]
       
Concentration Risk [Line Items]        
As a % of Revenues 20.00% 19.00% 19.00% 18.00%
Department of Homeland Security ("DHS") [Member]
       
Concentration Risk [Line Items]        
As a % of Revenues 18.00% 17.00% 18.00% 17.00%
Lockheed Martin Corporation [Member]
       
Concentration Risk [Line Items]        
As a % of Revenues       11.00%   
Maryland Procurement [Member]
       
Concentration Risk [Line Items]        
As a % of Revenues    11.00%    8.00%