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Stockholders' Equity (Details) (USD $) | 0 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 22, 2012 | Dec. 31, 2011
Stockholders' Equity Note [Abstract] |  |
Issuance of common stock, net of offering costs, shares | 5,520,000 |
Issuance of common stock, net of offering costs | $ 87,700,000 | $ 87,700,000
Underwriting Discounts and Commissions | 4,600,000 |
Other Indirect Cost In Connection With Public Offering | $ 127,000 |

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