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Earnings Per Share (Details Textual) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Earnings Per Share (Textual) [Abstract] |  |  |  |
Shares of unvested restricted stock | 1,535 | 1,385 | 1,364 | 1,237

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