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Earnings Per Share (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Earnings Per Share [Abstract] |  |  |  |
Weighted average nonvested restricted shares outstanding | 3,600,000 | 3,000,000 | 3,200,000 | 2,100,000
Weighted average number of OP units outstanding | 281,000 | 1,415,000 | 518,000 | 1,415,000

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