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Commitments and Contingencies (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012 Agreement Location	Dec. 31, 2011	Dec. 31, 2010
Commitments and Contingencies [Line Items]
Operating lease commitments included in restructuring charges and asset disposals	$ 11,802,569
Commitments and Contingencies (Textual) [Abstract]
Non- cancelable operating leases expiration dates	through 2027
Total rental expenses	2,531,929	2,838,066	3,239,518
Income from subleases	54,846	33,326	26,715
Number of change in control agreements	3
Number of locations	2
Employee compensation multiples	2.5
Change in control period considered after termination	6 months
Restructuring Charges [Member]
Commitments and Contingencies [Line Items]
Operating lease commitments included in restructuring charges and asset disposals	$ 574,782

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Employee compensation multiples.

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Non cancelable operating leases expiration dates.

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Number of change in control agreements.

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Number of locations.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 16

-Subparagraph b(i)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 122

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

-Subparagraph (Note 3)

-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697



Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-Section 50

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The amount of revenue recognized for the period under subleasing arrangements.

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Technical Bulletin (FTB)

-Number 88-1

-Paragraph 9

-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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