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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