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Other Long-Term Liabilities (Details Textual) (USD $) In Millions, unless otherwise specified	1 Months Ended	9 Months Ended
	Jun. 30, 2007	Sep. 30, 2012
Other Long -Term Liabilities (Textual)
Gain on sale and lease back of Loudoun, Virginia campus building, before tax		$ 2.8
Sale and lease back term, years	Over a 10-year period
Sale and lease back of Loudoun, Virginia campus building, sale price		$ 5.8
Minimum [Member]
Other Long -Term Liabilities (Textual)
Leasehold improvements, long-term liability amortization period, years		5 years
Maximum [Member]
Other Long -Term Liabilities (Textual)
Leasehold improvements, long-term liability amortization period, years		10 years

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- Definition

Leasehold improvements, long term liability amortization period.

+ References

No definition available.

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- Definition

The portion of the deferred gain that was recognized in the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 33

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Name Accounting Standards Codification

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-SubTopic 40

-Section 35

-Paragraph 1

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- Definition

The gross proceeds received from the asset(s) sold in connection with the transaction involving the sale of property to another party and the lease back to the seller.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 98

-Section Appendix A

-Paragraph 28, 29

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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- Definition

A description of the terms of the lease(s) related to the assets being leased-back in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 98

-Paragraph 17

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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