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Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
May. 21, 2015 | Apr. 24, 2015 | Feb. 24, 2015 | Jun. 30, 2015 | Feb. 28, 2015 | Apr. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Distributions |  |  |  |  |  |  |  |
Distribution to common shareholders (in dollars per share) | $ 0.39 | $ 0.39 | $ 0.39 |  |  |  |  |
Distribution to common shareholders | $ (91,655) | $ 92,585 | $ 79,530 |  |  |  | $ 171,185 | $ 146,783
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 |  |  |  |  | $ 659,502 | $ 322,807 | $ 659,502 | $ 322,864
RMR LLC |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |
Shares issued in connection with acquisition |  |  |  |  |  |  | 81,557 |
RMR LLC |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |
Shares issued in connection with acquisition |  |  |  | 2,345,000 |  |  |  |

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