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Commitments and Contingencies (Details Textual) (USD $) | 12 Months Ended
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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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- Definition 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of Financial Accounting Standard (FAS) -Number 13 -Paragraph 16 -Subparagraph b(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 122 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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