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Shareholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2012 | May 31, 2012 | Mar. 31, 2012 | Aug. 31, 2011 | May 31, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Jul. 09, 2012 | May 17, 2012 item | Dec. 31, 2011
Distributions |  |  |  |  |  |  |  |  |  |
Distribution to common shareholders (in dollars per share) |  | $ 0.38 |  | $ 0.37 | $ 0.37 |  |  |  |  |
Distribution to common shareholders |  | $ 61,813 |  | $ 56,748 | $ 52,490 | $ 123,619 | $ 104,976 |  |  |
Distribution declared to common shareholders (in dollars per share) |  |  |  |  |  |  |  | $ 0.38 |  |
Distribution declared to common shareholders |  |  |  |  |  |  |  | 67,061 |  |
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 |  |  |  |  |  |  |  |  | 2,000 |
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) |  |  |  |  |  |  |  |  | $ 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 | $ 287,100 |  |  |  |  |  | $ (103) |  |  |

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