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Earnings Per Share (Details Textual) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Earnings Per Share (Textual) [Abstract] |  |  |  |
Shares of unvested restricted stock | 1,558 | 1,357 | 1,328 | 1,162

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