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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 | 9 Months Ended |  |  | 0 Months Ended | 1 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 21, 2014 | May 21, 2014 | Feb. 21, 2014 | Apr. 30, 2014 | Jun. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 12, 2014 | Jun. 05, 2014 item | Jul. 07, 2014 Subsequent event | Jul. 31, 2014 Subsequent event | Sep. 30, 2014 RMR
Distributions |  |  |  |  |  |  |  |  |  |  |  |
Distribution to common shareholders (in dollars per share) | $ 0.39 | $ 0.39 | $ 0.39 |  |  |  |  |  |  | $ 0.39 |  |
Distribution to common shareholders | $ 79,469 | $ 73,397 | $ 73,386 |  |  | $ 226,252 | $ 215,559 |  |  | $ 79,515 |  |
Common shares issued as a part of compensation under business management agreement |  |  |  |  |  |  |  |  |  |  | 12,463 | 85,986
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 | $ 322,962 | $ 261,813 |  |  |  |  |
Common shares of beneficial interest |  |  |  |  |  |  |  |  |  |  |  |
Common shares of beneficial interest granted |  |  |  |  |  |  |  | 81,700 | 2,500 |  |  |
Common stock price per share which is the closing price at New York Stock Exchange (in dollars per share) |  |  |  |  |  |  |  | $ 21.42 | $ 24.50 |  |  |
Number of trustees |  |  |  |  |  |  |  |  | 5 |  |  |

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