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Shareholders' Equity (Details) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 21, 2017 | Jun. 05, 2015 | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Feb. 28, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jan. 13, 2017
Distributions |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  | $ 2,195,000 | $ 1,373,000 | $ 1,914,000 |
Distribution to common shareholders (in dollars per share) |  |  |  |  |  |  | $ 1.56 | $ 1.56 | $ 1.56 |
Dividends paid in kind |  |  |  | $ 0.1320 |  |  |  |  |  |
Distribution to common shareholders |  |  |  |  |  |  | $ 370,489,000 | $ 356,390,000 | $ 305,767,000 |
Common shares issued in public offering |  |  |  |  |  | 31,050,000 |  |  |  |
Net proceeds after underwriting discounts from issuance of common shares issued in public offering |  |  |  |  |  | $ 659,496,000 | $ 0 | $ 659,496,000 | $ 322,807,000 |
Common stock dividends, ordinary income distribution percentage |  |  |  |  |  |  | 58.77% | 51.48% | 54.00% |
Common stock dividends, capital distribution percentage |  |  |  |  |  |  | 40.67% | 47.80% | 46.00% |
Common stock dividends, capital gain distribution percentage |  |  |  |  |  |  | 0.56% | 0.72% | 0.00% |
RMR LLC |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |  |
Shares issued in connection with acquisition |  |  |  |  |  |  |  | 81,557 |  |
Distribution to common shareholders (in dollars per share) |  |  |  | $ 0.0111 |  |  |  |  |  |
Distribution to common shareholders |  |  |  | $ 2,635,379 |  |  |  |  |  |
Certain Our Officers And Employees Of RMR LLC |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |  |
Shares purchased from certain of our officers and other employees of RMR LLC |  |  | 19,230 |  | 13,113 |  |  |  |  |
RMR LLC |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |  |
Shares issued in connection with acquisition |  | 2,345,000 |  |  |  |  |  |  |  |
Share Award Plans |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |  |
Number of shares granted under the award plan |  |  |  |  |  |  | 92,150 | 99,000 | 94,200 |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |  |
Distribution to common shareholders (in dollars per share) | $ 0.39 |  |  |  |  |  |  |  |  |
Distribution declared to common shareholders (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.39
Distribution declared to common shareholders |  |  |  |  |  |  |  |  |  | $ 92,642,000
Dividends paid | $ 92,642,000 |  |  |  |  |  |  |  |  |

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