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Shareholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | --- | ---
Feb. 21, 2014 | Mar. 31, 2014 | Mar. 31, 2013 | Apr. 14, 2014 Subsequent event | Apr. 02, 2014 Subsequent event | Apr. 30, 2014 Subsequent event | Mar. 31, 2014 RMR | Apr. 30, 2014 RMR Subsequent event
Distributions |  |  |  |  |  |  |  |
Distribution to common shareholders (in dollars per share) | $ 0.39 |  |  |  | $ 0.39 |  |  |
Distribution to common shareholders | $ 73,386 | $ 73,386 | $ 68,857 | $ 73,393 |  |  |  |
Common shares issued as a part of compensation under business management agreement |  |  |  |  |  |  | 19,937 | 10,342
Common shares issued in public offering |  |  |  |  |  | 15,525,000 |  |
Net proceeds after underwriting discounts from issuance of common shares issued in public offering |  |  | $ 261,859 |  |  | $ 323,318 |  |

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