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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%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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