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Convertible Preferred Stock Convertible Preferred Stock (Tables) | 12 Months Ended
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Dec. 31, 2012
Features of Convertible Preferred Stock [Abstract] |
Schedule of Preferred Stock | The number of shares outstanding, conversion rates and corresponding conversion prices and conversion shares for our Series B Preferred Stock are listed below.
| December 31,
| 2012 |  | 2011 |  | 2010
Shares outstanding (actual number) | 221,474 |  |  | 221,474 |  |  | 221,474 |
Conversion rate per share | 76.2197 |  |  | 74.4500 |  |  | 73.1904 |
Conversion price | $ | 13.12 |  |  | $ | 13.43 |  |  | $ | 13.66 |
Conversion shares | 16.9 |  |  | 16.5 |  |  | 16.2 |

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