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Shareholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 1 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 09, 2012 | Feb. 09, 2012 | May 12, 2011 | Feb. 10, 2011 | Aug. 31, 2012 | Jul. 31, 2012 | Mar. 31, 2012 | Nov. 30, 2011 | Aug. 31, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Oct. 09, 2012 | Sep. 14, 2012 | May 17, 2012 item | Dec. 31, 2011
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution to common shareholders (in dollars per share) | $ 0.38 | $ 0.38 | $ 0.37 | $ 0.37 | $ 0.38 |  |  | $ 0.38 | $ 0.37 |  |  |  |  |  |
Distribution to common shareholders | $ 61,813 | $ 61,806 | $ 52,490 | $ 52,486 | $ 67,061 |  |  | $ 61,805 | $ 56,748 | $ 190,680 | $ 161,724 |  |  |  |
Distribution declared to common shareholders (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 0.39 |  |  |
Distribution declared to common shareholders |  |  |  |  |  |  |  |  |  |  |  | 68,856 |  |  |
Common shares issued in payment of an incentive fee for services rendered from RMR |  |  |  |  |  |  | 20,462 |  |  |  |  |  |  |  |
Value of common shares issued in payment of an incentive fee for services rendered from RMR |  |  |  |  |  |  | 453 |  |  |  |  |  |  |  |
Common shares of beneficial interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares of beneficial interest granted |  |  |  |  |  |  |  |  |  |  |  |  | 78,492 | 2,000 |
Common shares of beneficial interest, par value (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.01 |  |  | $ 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) |  |  |  |  |  |  |  |  |  |  |  |  | $ 22.62 | $ 20.48 |
Number of trustees |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |
Common shares issued in public offering (in shares) |  |  |  |  |  | 13,800,000 |  |  |  |  |  |  |  |  |
Net proceeds from issuance of common shares issued in public offering |  |  |  |  |  | $ 287,052 |  |  |  | $ 287,052 | $ 247,499 |  |  |  |

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