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Convertible Preferred Stock Convertible Preferred Stock (Tables)
 12 Months Ended
Dec. 31, 2011
Features of Convertible Preferred Stock [Abstract]  
Schedule of Preferred Stock
The number of shares outstanding, conversion rates and corresponding conversion prices for our Series B Preferred Stock as of December 31, 2011, 2010 and 2009 are listed below.
 
December 31,
 
2011
 
2010
 
2009
Shares outstanding (actual number)
221,474

 
221,474

 
525,000

Conversion rate per share
74.4500

 
73.1904

 
73.1904

Conversion price
$
13.43

 
$
13.66

 
$
13.66