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Shareholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended |  | 1 Months Ended |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 21, 2014 | Feb. 21, 2014 | Apr. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 05, 2014 item | Jul. 31, 2014 Subsequent event | Jul. 07, 2014 Subsequent event | Jun. 30, 2014 RMR | Jun. 30, 2014 RMR
Distributions |  |  |  |  |  |  |  |  |  |  |
Distribution to common shareholders (in dollars per share) | $ 0.39 | $ 0.39 |  |  |  |  |  |  |  |  |
Distribution to common shareholders | $ 73,397 | $ 73,386 |  |  | $ 146,783 | $ 142,206 |  |  |  |  |
Distribution declared to common shareholders (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.39 |  |
Distribution declared to common shareholders |  |  |  |  |  |  |  |  | 79,469 |  |
Common shares issued as a part of compensation under business management agreement |  |  |  |  |  |  |  | 11,223 |  | 30,900 | 50,837
Common shares issued in public offering |  |  | 15,525,000 | 15,525,000 |  |  |  |  |  |  |
Net proceeds after underwriting discounts from issuance of common shares issued in public offering |  |  | $ 323,318 | $ 323,318 | $ 322,864 | $ 261,813 |  |  |  |  |
Common shares of beneficial interest |  |  |  |  |  |  |  |  |  |  |
Common shares of beneficial interest granted |  |  |  |  |  |  | 2,500 |  |  |  |
Common stock price per share which is the closing price at New York Stock Exchange (in dollars per share) |  |  |  |  |  |  | $ 24.50 |  |  |  |
Number of trustees |  |  |  |  |  |  | 5 |  |  |  |

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