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Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 10, 2010 Item | Dec. 31, 2010 | Dec. 31, 2012 | Dec. 31, 2010 | Dec. 31, 2011
Stockholders' Equity |  |  |  |  |
Number of shares of common stock issued in equity offering |  | 4,955,000 |  |  |
Net proceeds from issue of shares of common stock in equity offering |  | $ 19,966 |  | $ 19,966 |
Stockholder Rights Plan |  |  |  |  |
Number of preferred share purchase rights declared as dividend for each outstanding share of common stock | 1 |  |  |  |
Number of shares of Series AA Preferred Stock that a registered holder of right is entitled to purchase | 0.001 |  |  |  |
Par value per share of Series AA preferred stock (in dollars per share) | $ 0.01 |  | $ 0.01 |  | $ 0.01
Exercise price (in dollars per one-thousandth of a share) | $ 48.00 |  |  |  |
Percentage of the company's common stock acquired by a third party upon which the rights become exercisable | 15.00% |  |  |  |
Minimum percentage of the company's common stock that must receive a tender offer from a third party upon which the rights become exercisable | 15.00% |  |  |  |
Beneficial ownership threshold for a holder of grandfathered stock (as a percent) | 20.00% |  |  |  |
Beneficial ownership threshold for a holder of grandfathered stock after amendment (as a percent) |  |  | 15.00% |  |
Stock Repurchases |  |  |  |  |
Total repurchase of common stock under the program authorized |  |  | $ 828 |  |

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