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Stockholders' Equity (Details) (USD $) | 12 Months Ended |  |  | 12 Months Ended | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Year from November 1, 2012 to October 31, 2013 | Dec. 31, 2012 Year from November 1, 2013 to October 31, 2014 | Dec. 31, 2012 November 1, 2014 and thereafter | Dec. 31, 2012 Debentures | Aug. 31, 2010 Preferred stock director | Dec. 31, 2012 Preferred stock director Q | Dec. 31, 2012 Preferred stock Minimum | Dec. 31, 2011 Preferred stock Minimum series
Stockholders' equity |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued | 1,213,142 | 1,213,142 |  |  |  |  |  | 1,213,142 |  |
Preferred stock, shares outstanding | 1,213,142 | 1,213,142 |  |  |  |  |  | 1,213,142 |  |
Preferred stock, par value (in dollars per share) | $ 0.001 | $ 0.001 |  |  |  |  |  | $ 10.00 |  |
Dividend rate (as a percent) | 6.00% |  |  |  |  |  |  | 6.00% |  |
Liquidation preference (in dollars per share) |  |  |  |  |  |  |  | $ 10 |  |
Number of shares to be issued for each preferred stock upon conversion |  |  |  |  |  |  |  | 0.06079 |  |
Conversion price (in dollars per share) |  |  |  |  |  |  |  | $ 164.50 |  |
Shares reserved for future issuance upon conversion |  |  |  |  |  |  |  | 73,747 |  |
Number of series of Preferred Stock |  |  |  |  |  |  |  |  |  | 1
Closing price of stock (in dollars per share) |  |  |  |  |  |  |  |  | $ 246.75 |
Percentage of the closing sales price of the entity's common stock that the conversion price must exceed in order for the preferred stock to be convertible |  |  |  |  |  |  |  | 150.00% |  |
Number of trading days within 30 trading days in which the closing price of the entity's common stock must exceed the conversion price for the preferred stock to be convertible |  |  |  |  |  |  |  |  | 20 days |
Number of trading days during which the closing price of the entity's common stock must exceed the conversion price for at least 20 days in order for the preferred stock to be convertible |  |  |  |  |  |  |  | 30 days |  |
Number of trading days prior to notice of automatic conversion |  |  |  |  |  |  |  | 5 days |  |
Number of quarters in which no preferred stock dividends have been paid |  |  |  |  |  |  |  | 6 |  |
Number of Board of Directors to be elected by Preferred Stock holders if entity fails to pay dividends on Preferred Stock |  |  |  |  |  |  |  | 2 |  |
Number of Board of Directors elected by the Preferred Stock holders when the entity failed to pay dividends on Preferred Stock |  |  |  |  |  |  | 2 |  |  |
Redemption price per share (in dollars per share) |  |  | $ 10.12 | $ 10.06 | $ 10.00 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 6.00% |  |  |  |
Debt principal amount per share, basis for exchange (in dollars per share) |  |  |  |  |  | $ 10 |  |  |  |
Debt instrument, term |  |  |  |  |  | 25 years |  |  |  |
Number of shares of Preferred Stock exchanged for common stock | 0 | 0 |  |  |  |  |  |  |  |

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