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Shareholders' Equity (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 26, 2015 $ / shares shares | Sep. 24, 2015 $ / shares shares | Sep. 02, 2015 $ / shares shares | Aug. 20, 2015 USD ($) $ / shares | May. 21, 2015 USD ($) $ / shares | May. 19, 2015 item $ / shares shares | Apr. 24, 2015 USD ($) $ / shares | Feb. 24, 2015 USD ($) $ / shares | Jun. 30, 2015 shares | Feb. 28, 2015 USD ($) shares | Apr. 30, 2014 USD ($) shares | Sep. 30, 2015 USD ($) shares | Sep. 30, 2014 USD ($)
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution to common shareholders (in dollars per share) | $ / shares |  |  |  | $ 0.39 | $ 0.39 |  | $ 0.39 | $ 0.39 |  |  |  |  |
Distribution to common shareholders | $ |  |  |  | $ 92,585 | $ (91,655) |  | $ 92,614 | $ 79,530 |  |  |  | $ 263,770 | $ 226,252
Common shares issued in public offering |  |  |  |  |  |  |  |  |  | 31,050,000 | 15,525,000 |  |
Net proceeds after underwriting discounts from issuance of common shares issued in public offering | $ |  |  |  |  |  |  |  |  |  | $ 659,496 | $ 322,807 | $ 659,496 | $ 322,962
Number of shares granted under the award plan | 2,500 |  | 84,000 |  |  | 2,500 |  |  |  |  |  |  |
Closing share price of the entity's common shares (in dollars per share) | $ / shares | $ 16.26 |  | $ 15.73 |  |  | $ 20.14 |  |  |  |  |  |  |
Number of trustees | item |  |  |  |  |  | 5 |  |  |  |  |  |  |
RMR LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in connection with acquisition |  |  |  |  |  |  |  |  |  |  |  | 81,557 |
Certain Our Officers And Employees Of RMR LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |
Shares purchased from certain of our officers and other employees of RMR LLC |  | 13,113 |  |  |  |  |  |  |  |  |  |  |
Closing share price of the entity's common shares (in dollars per share) | $ / shares |  | $ 16.19 |  |  |  |  |  |  |  |  |  |  |
RMR LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in connection with acquisition |  |  |  |  |  |  |  |  | 2,345,000 |  |  |  |

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