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Shareholders' Equity (Details) (USD $) In Thousands, except Share data | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2011 | Aug. 31, 2011 | Jul. 31, 2011 | Nov. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | Dec. 31, 2010 | Sep. 16, 2011 | Oct. 04, 2011 Distribution declared in October 2011
Distributions |  |  |  |  |  |  |  |  |
Distribution to common shareholders (in dollars per share) |  | $ 0.37 |  | $ 0.37 |  |  |  |  |
Distribution to common shareholders |  | $ 56,748 |  | $ 47,167 | $ 161,724 | $ 137,589 |  |  |
Distribution declared to common shareholders (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.38
Distribution declared to common shareholders |  |  |  |  |  |  |  |  | 61,805
Common shares of beneficial interest |  |  |  |  |  |  |  |  |
Common shares of beneficial interest granted (in shares) |  |  |  |  |  |  |  | 72,450 |
Common shares of beneficial interest, par value (in dollars per share) |  |  |  |  | $ 0.01 |  | $ 0.01 | $ 0.01 |
Common stock price per share which is the closing price at New York Stock Exchange (in dollars per share) |  |  |  |  |  |  |  | $ 23.90 |
Common shares issued in public offering (in shares) | 9,200,000 |  | 11,500,000 |  | 11,500,000 |  | 14,400,000 |  |
Net proceeds from issuance of common shares issued in public offering | $ 184,739 |  | $ 247,500 |  | $ 247,499 |  |  |  |

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