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Common Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended
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May 18, 2011 | Mar. 31, 2012 | Mar. 31, 2011
Common Stock [Abstract] |  |  |
Public offering of common stock shares | 6,037,500 |  |
Public offering of common stock, price per share | $ 10.70 |  |
Common stock purchased by underwriters | 787,500 |  |
Net proceeds of the offering after deducting underwriting discounts, commissions and offering expenses | $ 62,803 | $ 1,211 | $ 1,186

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