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Nature of Business and Significant Accounting Policies (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Weighted Average Number of Shares Outstanding Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic weighted average common shares outstanding (in shares) |  |  |  |  |  |  |  |  | 5,282,047 | 5,232,055 | 5,189,263
Effect of dilutive options (in shares) |  |  |  |  |  |  |  |  | 27,815 | 35,802 | 29,971
Diluted weighted average shares outstanding (in shares) | 5,323,000 | 5,311,000 | 5,312,000 | 5,293,000 | 5,293,000 | 5,268,000 | 5,268,000 | 5,242,000 | 5,309,862 | 5,267,857 | 5,219,234
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of facilities under capital lease | 4 |  |  |  |  |  |  |  | 4 |  |
Estimated useful life |  |  |  |  |  |  |  |  | 15 years |  |
Concentration of Credit Risk [Abstract] |  |  |  |  |  |  |  |  |  |  |
Percentage of contracts with the government (in hundredths) |  |  |  |  |  |  |  |  | 99.00% | 99.00% | 99.00%
Deferred Compensation Plans [Abstract] |  |  |  |  |  |  |  |  |  |  |
Deferred compensation plan expense |  |  |  |  |  |  |  |  | $ 1.2 | $ 1.4 | $ 1.9
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life of intangible assets |  |  |  |  |  |  |  |  | 11 years |  |
Akimeka, LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of intangible assets |  |  |  |  |  |  |  |  | 1.0 |  |
ICRC [Member] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of intangible assets |  |  |  |  |  |  |  |  | 1.9 |  |
Goodwill impairment |  |  |  |  |  |  |  |  | $ 6 |  |
Contract-related [Member] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful Life of intangible assets |  |  |  |  |  |  |  |  | 5 years |  |
Weighted average useful life of intangible assets |  |  |  |  |  |  |  |  | 11 years 3 months 18 days |  |
Trade Name [Member] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful Life of intangible assets |  |  |  |  |  |  |  |  | 8 years 9 months 18 days |  |
Acquired Technologies [Member] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful Life of intangible assets |  |  |  |  |  |  |  |  | 11 years |  |
Computer Equipment and Furniture [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  |  | 3 years |  |
Computer Equipment and Furniture [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  |  | 15 years |  |
Buildings and Land Improvements [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  |  | 15 years |  |
Buildings and Land Improvements [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  |  | 20 years |  |

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