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Stockholders' Equity (Details) - $ / shares |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Oct. 08, 2015 | Dec. 15, 2008 | Dec. 31, 2015 | Sep. 30, 2015
Class of Stock [Line Items] |  |  |  |
Common stock, par value |  |  | $ 0.01 | $ 0.01
Minimum percent ownership of common stock for exercise of rights |  |  | 15.00% |
Series A Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock, par value |  | $ 0.01 |  |
Exercise price of rights |  | $ 51.60 |  |
Rights expiration period |  | 10 years |  |
Collective ownership threshold for joint filers | 19.90% |  |  |

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