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Commitments and Contingencies (Details 2) (USD $) In Millions, except Per Share data, unless otherwise specified | 9 Months Ended | 12 Months Ended | 150 Months Ended
--- | --- | --- | ---
Sep. 30, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Jan. 31, 2009
Preferred Dividends |  |  |  |  |
Dividend rate (as a percent) | 6.00% |  |  |  | 6.00%
Period for which preferred dividends in arrears |  | 9 months | 9 months | 1 year |
Dividend paid per share (in dollars per share) |  | $ 0.15 |  |  |
Accrued and unpaid dividends in arrears on preferred stock |  | $ 1.6 |  |  |
Accrued and unpaid dividends in arrears on preferred stock per share (in dollars per share) |  | $ 1.30 |  |  |

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- Definition Aggregate amount of cumulative preferred dividends in arrears. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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