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