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Shareholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 1 Months Ended | 6 Months Ended |  |  | 0 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jul. 03, 2013 | May 21, 2013 | Feb. 19, 2013 | Jan. 31, 2013 | Jun. 30, 2013 | Jun. 30, 2012 | May 09, 2013 item | Dec. 31, 2012 | Mar. 27, 2013 RMR
Distributions |  |  |  |  |  |  |  |  |
Distribution to common shareholders (in dollars per share) | $ 0.39 | $ 0.39 | $ 0.39 |  |  |  |  |  |
Distribution to common shareholders | $ 73,353 | $ 73,349 | $ 68,857 |  | $ 142,206 | $ 123,619 |  |  |
Common shares issued in payment of an incentive fee for services rendered from RMR |  |  |  |  |  |  |  |  | 21,968
Value of common shares issued in payment of an incentive fee for services rendered from RMR |  |  |  |  |  |  |  |  | 582
Common shares issued in public offering |  |  |  | 11,500,000 |  |  |  |  |
Net proceeds from issuance of common shares issued in public offering |  |  |  | $ 262,068 | $ 261,813 |  |  |  |
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) |  |  |  |  |  |  | $ 28.64 |  |
Number of trustees |  |  |  |  |  |  | 5 |  |

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